Samacheer Kalvi Class 11 Bio Zoology Solutions Chapter 12 Trends in Economic Zoology

Part I

 

Question 1. Which one of the following is not related to vermiculture?
(a) Maintains soil fertility
(b) Break down of inorganic matter
(c) Gives porosity, aeration and moisture holding capacity
(d) Degradation of non-biodegradable solid waste
Choose the correct option:
(a) a and b is correct
(b) c and d is correct
(c) b and d is not correct
(d) a and c is not correct
Answer: (c) b and d is not correct
In simple words: Vermiculture helps soil become healthier and breaks down natural waste. It makes the soil loose, airy, and good at holding water. However, it cannot break down man-made, inorganic materials or waste that does not rot. Therefore, statements (b) and (d) are not related to what vermiculture does.

🎯 Exam Tip: Remember that vermiculture is an organic process involving earthworms. It helps with natural decomposition and soil health, but cannot deal with artificial or non-biodegradable waste.

 

Question 2. Which one of the following is not an endemic species of earthworm?
(a) Perionyx
(b) Lampito
(c) Eudrillus
(d) Octochaetona
Answer: (c) Eudrillus
In simple words: Many kinds of earthworms live naturally in India. Out of the given choices, Perionyx, Lampito, and Octochaetona are types of earthworms commonly found here. Eudrillus is not originally from India; it is a species brought from other places.

🎯 Exam Tip: When identifying endemic species, look for those naturally belonging to a specific region, versus exotic or introduced species.

 

Question 3. Match the following
1) Bombyxmori- a) Champa – I) Muga
2) Antheraeaassamensis b) Mulberry – II) Eri
3) Antheraeamylitta- c) Arjun – III) Tassar
4) Attacus ricini d) Castor – IV) Mulberry
Select the correct one
(a) 1-b-IV
(b) 2-a-l
(c) 3-c -III
(d) 4-d-II
Answer: (c) 3-c -III
In simple words: This question asks you to match silk moths with the plants they feed on and the type of silk they produce. The correct match shows Antheraeamylitta feeding on Arjun trees to produce Tassar silk.

🎯 Exam Tip: Learn the specific host plants and silk types for common silk moths to answer matching questions accurately.

 

Question 4. Silk is obtained from
(a) Laccifer lacca
(b) Nosema bombycis
(c) Attacus ricird
(d) Attacus mylitta
Answer: (c) Attacus ricird
In simple words: Silk is made by certain insects. The silk type mentioned here, Attacus ricini, is a specific moth known for producing Eri silk.

🎯 Exam Tip: Identify the correct scientific name for the organism that produces a particular type of silk, as this is a key knowledge point.

 

Question 5. Assertion: Nuptial flight is a unique flight taken by the queen bee followed by serveral drones. Reason: The queen bee produces a chemical substance called pheromone. The drones in that area are attracted to the pheromone and then mating takes place.
(a) Assertion and reason is correct but not related
(b) Assertion and reason is incorrect but related
(c) Assertion and reason is correct but related
(d) Assertion and reason is incorrect but not related
Answer: (c) Assertion and reason is correct but related
In simple words: The first statement (assertion) says that the queen bee's special mating flight is called a nuptial flight, with many male bees (drones) following. The second statement (reason) explains that the queen releases a scent (pheromone) which attracts the drones for mating. Both statements are true, and the reason directly explains why the nuptial flight happens.

🎯 Exam Tip: For assertion-reason questions, first check if both statements are true individually. Then, check if the reason correctly explains the assertion, often by adding "because" between them.

 

Question 6. Rearing of honey bee is called
(a) Sericulture
(b) Lac culture
(c) Vermiculture
(d) Apiculture
Answer: (d) Apiculture
In simple words: Each type of animal rearing has a specific name. Apiculture refers to keeping and caring for honey bees, usually to collect honey and other bee products.

🎯 Exam Tip: Know the specific terms for rearing different animals, such as sericulture (silkworms), lac culture (lac insects), and vermiculture (earthworms).

 

Question 7. Which of the statement regarding Lac insect
(a) A microscopic, resinous crawling scale insect
(b) Inserts its proboscis into plant tissue to suck juices and grows
(c) Secretes lac from the hind end of body
(d) The male lac insect is responsible for large scale production of lac.
Answer: (d) The male lac insect is responsible for large scale production of lac.
In simple words: Lac insects are tiny, scale-like insects that produce lac. They use a special mouthpart to feed on plant juices. Female lac insects are the main ones that produce a lot of lac, not the males.

🎯 Exam Tip: Focus on the specific roles of male and female insects in production, especially for economically important species like lac insects.

 

Question 8. Aquaponics is a technique which is
(a) A combination of aquaculture and fish culture
(b) A combination of aquaculture and hydroponics
(c) A combination of vermiculture and hydroponics
(d) A combination of aquaculture and prawn culture
Answer: (b) A combination of aquaculture and hydroponics
In simple words: Aquaponics is a way of growing both fish and plants together. It combines raising fish (aquaculture) with growing plants without soil (hydroponics), where the fish waste provides nutrients for the plants.

🎯 Exam Tip: Understand the core components of aquaponics: fish farming (aquaculture) and soilless plant growing (hydroponics).

 

Question 9. Prawn belongs to the class
(a) Crustacea
(b) Annelida
(c) Coelenterata
(d) Echinodermata
Answer: (a) Crustacea
In simple words: Prawns are a type of sea animal. They belong to a group of animals called Crustacea, which also includes crabs and lobsters, all having hard outer shells.

🎯 Exam Tip: Remember the classification of common aquatic animals. Crustacea are arthropods with exoskeletons and jointed legs.

 

Question 10. Pearl oyster belongs to the class
(a) Gastropoda
(b) Cephalopoda
(c) Scaphapoda
(d) Pelecypoda
Answer: (d) Pelecypoda
In simple words: Pearl oysters are marine animals that make pearls. They belong to the class Pelecypoda, which includes bivalve molluscs like clams and mussels that have two shells.

🎯 Exam Tip: Mollusc classification is important; remember that oysters, with their two shells, belong to the bivalve group, Pelecypoda.

 

Question 11. Inland fisheries are
(a) deep sea fishing
(b) capturing fishes from sea coast
(c) Raising and capturing fishes in fresh water
(d) oil extraction from fish
Answer: (c) Raising and capturing fishes in fresh water
In simple words: Inland fisheries focus on fish found in bodies of water that are not the sea. This means they involve catching and farming fish in places like rivers, lakes, and ponds, which are all freshwater environments.

🎯 Exam Tip: Distinguish between inland fisheries (freshwater) and marine fisheries (sea/ocean) based on their water source.

 

Question 12. Induced breeding technique is used in
(a) Marine fishery
(b) Capture fishery
(c) Culture fishery
(d) Inland fishery
Answer: (d) Inland fishery
In simple words: Induced breeding is a method used to make fish reproduce, especially when they don't do it naturally in captivity. This technique is very helpful in freshwater farming, which is known as inland fishery, to produce more fish.

🎯 Exam Tip: Understand that induced breeding helps control and increase fish populations in confined freshwater environments, supporting culture fisheries.

 

Question 13. Isinglass is used in
(a) Preparation
(b) Clearing of wines
(c) Distillation of wines
(d) Preservation of wines
Answer: (b) Clearing of wines
In simple words: Isinglass is a pure form of gelatin that comes from fish bladders. It is mainly used to make wines and beers clear by helping unwanted particles settle down.

🎯 Exam Tip: Isinglass is a fining agent, a substance used to remove impurities and clarify liquids like wine and beer.

 

Question 14. Animal husbandry is the science of rearing, feeding and caring, breeding and disease control of animals. It ensures supply of proper nutrition to our growing population through activities like increased production and improvement of animal products like milk, eggs, meat, honey etc.
(a) Poultry production depends upon the photoperiod. Discuss
(b) Polyculture of fishes is of great importance.
Answer:
(a) Poultry production depends upon the photoperiod:
The amount of light birds receive, called photoperiod, plays a big role in poultry farming. Light makes certain glands in birds produce more hormones. This extra light also boosts their metabolism, which means hens will lay more eggs. This is why controlling light is important for chicken growth and breeding.
(b) Polyculture of fishes is of great importance:
Polyculture is a farming method where different types of fish are grown together in the same pond. This is important because the fish do not fight for food, as each type eats different things. There is also no shortage of oxygen. Upper-layer fish eat tiny plants and animals, middle-layer fish eat submerged plants, and bottom-dwelling fish eat debris. This way, all parts of the food in the pond are used efficiently. Fish grow quickly in this system and convert most of their food into body mass. For example, Catla catla, Cirrhinus mrigala, and Labeo rohita are often farmed together using polyculture.
In simple words: Photoperiod, or the amount of light, helps chickens grow and lay more eggs by affecting their hormones. Polyculture is when many fish types are grown together; they eat different foods and live in different parts of the pond, which uses food well and helps them grow fast without fighting.

🎯 Exam Tip: When discussing poultry production, highlight the role of environmental factors like light. For polyculture, emphasize how different species reduce competition and maximize resource utilization.

 

Question 15. Assertion: The best quality of pearl is known as lingha pearl and obtained from marine oysters. Reason: Nacre is secreted continuously by the epithelial layer of the mantle and deposited around the foreign particle
(a) Assertion is true Reason is false
(b) Assertion and Reason is false
(c) Assertion is false but Reason is true
(d) Assertion and Reason are true
Answer: (d) Assertion and Reason are true
In simple words: The first statement (assertion) is true, saying that Lingha pearls are top quality and come from sea oysters. The second statement (reason) is also true, explaining that nacre (the shiny material of a pearl) is always made by a layer of tissue called the mantle and wraps around any foreign object inside the oyster. Both facts are correct and the reason explains how pearls are formed.

🎯 Exam Tip: Remember that the quality and formation of pearls are due to the oyster's biological process of secreting nacre around an irritant.

 

Question 16. Choose the correctly matched pair
(a) Egg layers-Brahma
(b) Broiler types -Leghorn
(c) Dual purpose-White plymouth rock
(d) Ornamental breeds -Silkie
Answer: (d) Ornamental breeds -Silkie
In simple words: Different chicken breeds are known for different purposes. Silkie chickens are famous for their unique, fluffy feathers, which make them popular as ornamental birds for their beautiful appearance rather than for egg or meat production.

🎯 Exam Tip: Familiarize yourself with common poultry breeds and their primary uses (e.g., egg-laying, meat production, or ornamental purposes).

 

Question 17. Write the advantages of vermicomposting.
Answer:
1. Vermicomposting creates excellent natural manure, which is good for farming in a sustainable way.
2. Selling vermicompost can provide extra money for people.
3. Vermicompost is full of important nutrients that plants need to grow.
4. It makes the soil better by improving its structure, texture, and how well it takes in air and holds water, which also stops soil from washing away.
5. This compost has many nutrients and can be added to soil to help plants grow well in fields and home gardens.
6. Vermicompost helps seeds sprout better and makes sure plants grow strong and healthy. An enriching sentence about why this works is that earthworms break down organic matter, releasing nutrients in a form easily absorbed by plants.
In simple words: Vermicomposting makes great natural fertilizer, earns extra money, and provides many plant nutrients. It improves soil by making it airy, good at holding water, and stops erosion. It also helps seeds grow and plants stay healthy.

🎯 Exam Tip: When listing advantages, cover multiple aspects like environmental benefits, economic benefits, and direct benefits to soil and plant health.

 

Question 18. Name the three castes in a honey bee colony.
Answer:
1. Queen bee
2. Drone
3. Worker bee. Each caste has a specific role, ensuring the colony's survival and reproduction.
In simple words: A honey bee colony has three types of bees: the Queen bee, the Drone (male bee), and the Worker bee.

🎯 Exam Tip: Remember the three main castes of a honey bee colony and their basic functions (queen for reproduction, drones for mating, workers for various tasks).

 

Question 19. Name the following
1. The largest bee in the colony:
2. The kind of flight which the new virgin queen takes along with the drones out of the hive:
Answer:
1. The largest bee in the colony – The queen bee
2. The kind of flight which the new virgin queen takes along with the drones out of the hive – Nuptial flight. This important flight ensures the queen mates and starts a new colony.
In simple words: The biggest bee in a colony is the queen bee. The special flight where a new queen mates with many male bees is called a nuptial flight.

🎯 Exam Tip: Key terms like "queen bee" and "nuptial flight" are crucial for describing honey bee colony structure and behavior.

 

Question 20. What are the main duties of a worker bee?
Answer: A worker bee performs many different tasks throughout its life. In the first half of her life, she works inside the hive. She acts as a nurse bee, making royal jelly, preparing bee-bread to feed baby bees (larvae), feeding the queen, and taking care of the queen and male bees (drones). She also makes beeswax, builds combs, cleans, and fans the beehive. After this, she becomes a guard and protects the hive. In the second half of her life, which lasts about three weeks, she flies out to search for and collect pollen, nectar, propolis, and water for the colony. Worker bees are vital for the day-to-day functioning and survival of the entire bee colony.
In simple words: Worker bees do many jobs. They feed young bees and the queen, make wax, build the hive, clean, and guard. Later, they fly out to collect pollen, nectar, and water.

🎯 Exam Tip: When describing worker bee duties, categorize them into indoor tasks (nursing, building, cleaning) and outdoor tasks (foraging) to show a comprehensive understanding.

 

Question 21. What happens to the drones after the mating flight?
Answer: The male bees (drones) are attracted to special scents (pheromones) released by the queen bee, which leads to mating. After the mating flight and successful copulation, the drone dies. Drones only have one main purpose, which is to mate with the queen, and they do not live long after fulfilling this role. This ensures that only the strongest and fastest drones get to mate.
In simple words: After mating with the queen bee, the male bee (drone) dies. Their only job is to mate, and they do not live past this event.

🎯 Exam Tip: Highlight the singular purpose of drones in bee colonies and the consequence of their mating flight.

 

Question 22. Give the economic importance of silkworm?
Answer:
1. Rearing silkworms on a large scale for business is called sericulture.
2. Sericulture is a farming-based business that includes growing plants for silkworms to eat, raising the silkworms, and then unwinding (reeling) and spinning the silk.
3. Silk threads are used to make silk clothes, which are highly valued.
4. Silk is used in different industries and even for military purposes, showing its wide range of uses.
5. Silk is also used to make fishing fibers, parachutes, bags for cartridges, insulation for telephones, wireless receivers, tires for racing cars, filter fibers, medical bandages, and stitches. The versatility of silk makes it a very important natural fiber.
In simple words: Silkworms are important for making silk, which is used for clothes, industries, and military items. The process, called sericulture, involves growing silkworms and processing their silk threads.

🎯 Exam Tip: When discussing economic importance, list various products and industries that benefit from the silkworm, showing the broad impact.

 

Question 23. What are the nutritive values of fishes?
Answer:
1. Fish are a great source of protein, which is essential for our bodies.
2. They are a reliable and good food source that helps meet people's nutritional needs.
3. Many types of fish, like sardines, mackerel, tuna, and herrings, have a lot of important amino acids.
4. Fish also contain histidine, which gives their meat its distinct and pleasant flavor.
5. They are rich in omega-3 fatty acids, which are good for heart and brain health.
6. Important minerals like calcium, magnesium, phosphorus, potassium, iron, manganese, iodine, and copper are also found in fish. This wide range of nutrients makes fish a highly beneficial food.
In simple words: Fish are rich in protein, essential amino acids, and healthy omega-3 fats. They also provide many minerals like calcium and iron, making them a very nutritious food for people.

🎯 Exam Tip: Focus on the key nutritional components of fish, such as protein, omega-3 fatty acids, and essential minerals, and explain their benefits.

 

Question 24. Give the economic importance of prawn fishery?
Answer: Prawns are economically important because their meat is delicious and highly sought after. Prawn flesh is tasty and full of glycogen, which is a type of stored sugar, and protein. It also has a low-fat content, making it a healthy food choice. This makes prawn farming and fishing a valuable industry. The high demand for prawns supports many jobs in coastal areas.
In simple words: Prawns are important because their meat is tasty, high in protein and glycogen, and low in fat. This makes prawn fishing a valuable business.

🎯 Exam Tip: When discussing economic importance, focus on the marketable qualities of the product, such as taste, nutritional value, and demand.

 

Question 25. Give the economic importance of lac insect.
Answer:
1. Lac is used as a sealing wax, which is helpful for sealing documents and other items.
2. It is a good insulator, meaning it does not let electricity pass through easily.
3. Lac is used in making polishes for shoes and leather, and also as a protective coating for wood.
4. It is used for laminating paper, board, photographs, and plastic molded items.
5. Lac is also used as a material to fill in gold ornaments, giving them a smooth finish. The diverse applications of lac make it a valuable natural resin.
In simple words: Lac from lac insects is used as sealing wax, a good insulator, and in polishes for shoes and wood. It also helps laminate paper and fill gold jewelry.

🎯 Exam Tip: List the various industrial and practical applications of lac to demonstrate its economic value across different sectors.

 

Question 26. List any three common uses of shellac.
Answer:
1. Shellac mixed with denatured alcohol is used to clean dust from walls.
2. Coating metals with shellac helps stop them from rusting.
3. Shellac coating on citrus fruits helps them stay fresh longer. Shellac is a versatile natural resin with many protective and aesthetic uses.
In simple words: Shellac is used to clean walls, protect metals from rust, and keep citrus fruits fresh for longer.

🎯 Exam Tip: Provide specific examples of shellac's uses, highlighting its protective and adhesive properties.

 

Question 27. Name any two trees on which lac insect grows?
Answer:
1. Acacia catechu
2. Acacia nilotica. These trees provide the necessary sap for the lac insects to feed and produce lac.
In simple words: Lac insects grow on trees like Acacia catechu and Acacia nilotica.

🎯 Exam Tip: Remember common host trees for lac insects, as they are crucial for lac production.

 

Question 28. What is seed lac?
Answer: Seed lac is a type of lac that is created after raw lac has been processed. First, the lac is ground, and then all the dust particles are removed from it. The clean lac that remains after this process is called 'seed lac'. It is a key intermediate product in lac processing.
In simple words: Seed lac is the cleaned lac that remains after raw lac is ground and all dust is removed.

🎯 Exam Tip: Define seed lac by describing the processing steps (grinding, dust removal) that lead to its formation from raw lac.

 

Question 29. Define cross-breeding?
Answer: Cross-breeding is a method of animal reproduction where a superior male from one breed is mated with a superior female from a different breed. The goal is to combine the best traits from both breeds into their offspring. This technique helps to create animals with improved characteristics, such as better growth or higher production.
In simple words: Cross-breeding is when a top male from one animal breed mates with a top female from another breed to get better qualities in their babies.

🎯 Exam Tip: Clearly state that cross-breeding involves two different breeds and aims to combine desirable traits from both parents.

 

Question 30. What are the advantages of artificial insemination?
Answer:
1. Artificial insemination helps increase the chances of animals getting pregnant.
2. It helps prevent the spread of genital diseases among animals.
3. Semen can be collected from injured male animals (bulls) that have good traits, allowing their genes to still be used for breeding.
4. It allows superior animals that are far apart to be bred successfully. This means desirable genes can be spread more widely and efficiently.
In simple words: Artificial insemination improves pregnancy rates, stops diseases, lets injured good males still breed, and helps animals far apart mate successfully.

🎯 Exam Tip: List the benefits of artificial insemination, focusing on aspects like reproductive efficiency, disease control, and genetic improvement over distances.

 

Question 31. Discuss the various techniques adopted in cattle breeding?
Answer: There are two main ways to breed animals: inbreeding and outbreeding.
1. Inbreeding: This involves breeding animals of the same breed for about 4 to 6 generations. The main goal is to keep specific desired traits within the breed. Inbreeding can help increase the chances of getting certain good traits, but it can also expose harmful hidden genes and reduce the overall health and fertility of the animals.
2. Outbreeding: This is when animals that are not closely related are bred. It is done in three main ways:
    a) Outcrossing: This is breeding between unrelated animals of the same breed that have no common ancestors for at least 4-6 generations. It helps improve traits in animals that are below average.
    b) Crossbreeding: This involves breeding a top male from one breed with a top female from another breed. The offspring usually have better traits, a condition known as hybrid vigor or heterosis.
    c) Interspecific hybridization: In this method, different species are mated together. For example, mating a male and female from two different species. This can lead to offspring with unique combinations of traits, like a mule, which is a hybrid of a donkey and a horse. Each technique serves different goals in improving cattle populations.
In simple words: Cattle breeding uses two main ways: inbreeding (mating closely related animals of the same breed) and outbreeding (mating unrelated animals). Outbreeding includes outcrossing (same breed, no common ancestors), crossbreeding (different breeds for better traits), and interspecific hybridization (different species).

🎯 Exam Tip: Clearly define inbreeding and outbreeding. For outbreeding, distinguish between outcrossing, crossbreeding, and interspecific hybridization with brief explanations and examples if possible.

 

Question 32. Mention the advantages of MOET.
Answer: The Multiple Ovulation Embryo Transfer (MOET) technology has a significant advantage: it can quickly produce many high milk-yielding female animals. It also helps in raising high-quality, meat-yielding male animals in a short amount of time. This speeds up genetic improvement in livestock by allowing more offspring from superior parents. This technology is very useful for improving animal herds faster.
In simple words: MOET helps create many female animals that give a lot of milk, and good male animals for meat, all in a short time.

🎯 Exam Tip: When explaining MOET advantages, focus on its ability to rapidly multiply superior genetic traits for both milk and meat production.

 

Question 33. Write the peculiar characters of the duck.
Answer: Ducks have several unique characteristics. Their bodies are completely covered with oily feathers, which makes them waterproof. They also have a layer of fat under their skin, which stops water from soaking through and keeps them dry. Ducks typically lay their eggs at night or in the morning, which is different from many other birds. They feed on various items like rice bran, kitchen waste, waste fish, and snails, making them good at cleaning up. These features make ducks well-suited for aquatic environments and efficient foragers.
In simple words: Ducks have oily, waterproof feathers and a fat layer under their skin to stay dry. They lay eggs at night or in the morning and eat many things like rice, kitchen scraps, and snails.

🎯 Exam Tip: Highlight adaptations that make ducks unique, such as their waterproof feathers, feeding habits, and egg-laying time.

 

Question 3. Which of the following are the biological indicators of soil fertility?
(a) Vermicast
(b) Earthworm
(c) Vermi excreta
(d) Vermicompost
Answer: (b) Earthworm
In simple words: Earthworms help keep soil healthy, which means they are natural signs that the soil is fertile and good for plants. They are like a natural meter for soil health.

🎯 Exam Tip: Remember that earthworms improve soil structure and nutrient cycling, making them excellent indicators of healthy, fertile soil.

 

Question 4. Which of the following is the earthworm of the native soil?
(a) Periyonx Eisenia
(b) Eudrilus eugeniae lampito mauritii
(c) Periyonyx excavatus, octohaetona
(d) All of the options
Answer: (c) Periyonyx excavatus, octohaetona
In simple words: Out of the choices, Periyonyx excavatus and Octohaetona are types of earthworms that naturally live in the soil of their original region. Knowing native species is important for local ecology.

🎯 Exam Tip: When identifying native species, look for those naturally occurring in a region, as opposed to introduced or exotic species.

 

Question 5. Which is called commercial fibre?
(a) Silk fibre
(b) Nylon fibre
(c) Cofton fibre
(d) Jute fibre
Answer: (a) Silk fibre
In simple words: Silk fibre is known as a commercial fibre because it is produced and sold widely for making clothes and other goods. It is a valuable natural product.

🎯 Exam Tip: Commercial fibres are those produced on a large scale for economic profit, and silk fits this description due to its high value.

 

Question 6. Who has known the utility of silk even before 3000 years?
(a) Europe
(b) African's
(c) China
(d) India
Answer: (c) China
In simple words: China was the first country to discover and use silk many thousands of years ago. The knowledge of silk making started in ancient China.

🎯 Exam Tip: Historical facts like the origin of silk are important for understanding economic zoology trends.

 

Question 7. More than countries in the world are practicing sericulture
(a) 29
(b) 40
(c) 10
(d) 15
Answer: (a) 29
In simple words: More than 29 countries around the world raise silkworms to make silk. This shows that sericulture is a global practice.

🎯 Exam Tip: Be precise with numerical facts related to global practices like sericulture.

 

Question 8. Match and find the correct sequences.
I. Bombyx mori – a) Erisilk
II. Antheraea assamensis – b) Tisaarsilk
III. Antheraea mylitta – c) Mugasilk
IV. Attacus ricini – d) Mulberry silk
(a) I-d, II-c, III-b, IV-a
(b) I-a, II-b, III-c, IV-d
(c) I-a, II-c, III-d, IV-b
(d) I-d, II-a, V-c
Answer: (a) I-d, II-c, III-b, IV-a
In simple words: This question matches different types of silkworms with the kind of silk they produce. Bombyx mori makes Mulberry silk, Antheraea assamensis makes Mugasilk, Antheraea mylitta makes Tisaarsilk, and Attacus ricini makes Erisilk.

🎯 Exam Tip: Memorize the specific silk types produced by each silkworm species to correctly match them.

 

Question 9. Match the silk moth with their respective leaves.
I. Bombyx mori – a) Castor
II. Antheraea assamensis – b) Arjun
III. Antheraea mylitta – c) Champa
IV. Attacus ricini – d) Mulberry
(a) I-d, II-c, III-b, IV-a
(b) I-c, II-b, III-a, IV-d
(c) I-a, II-b, III-c, IV-d
(d) I-d, II-c, III-a, IV-b
Answer: (a) I-d, II-c, III-b, IV-a
In simple words: Each type of silk moth prefers to eat leaves from specific plants. Bombyx mori eats Mulberry, Antheraea assamensis eats Champa, Antheraea mylitta eats Arjun, and Attacus ricini eats Castor leaves.

🎯 Exam Tip: Knowing the host plants for each silk moth is crucial for understanding sericulture practices.

 

Question 10. Find the unrelated pair regarding the silk production and its states.
(a) Karnataka – Mulberry silk
(b) Manipur – Muga silk
(c) West bengal – Tasar silk
(d) Arunachala pradesh – Muga silk
Answer: (d) Arunachala pradesh – Muga silk
In simple words: All the other pairs correctly link a state with a type of silk production it is known for, except for Arunachal Pradesh and Muga silk. Muga silk is primarily associated with Assam.

🎯 Exam Tip: Understand the geographical distribution and specialized silk production of different regions.

 

Question 11. Name the branches that involve agriculture and industry.
(a) Vermiculture
(b) Pisciculture
(c) Sericulture
(d) Poultry
Answer: (c) Sericulture
In simple words: Sericulture involves both farming (growing food for silkworms) and industry (processing silk). This makes it a unique mix of agriculture and manufacturing.

🎯 Exam Tip: Identify activities that combine primary (agriculture) and secondary (industry) economic sectors.

 

Question 12. Life span of Bombyxmori
(a) 2-3 days
(b) 2 – 4 days
(c) 2-5 days
(d) 4 – 7 days
Answer: (a) 2 – 3 days
In simple words: The adult Bombyx mori moth lives for a very short time, usually only two to three days. Their main job is to reproduce quickly.

🎯 Exam Tip: Note the typical life spans of different insect species, especially those important in economic zoology.

 

Question 13. What is the number of eggs laid by Bombyx mori once?
(a) 500 - 800
(b) 400 – 500
(c) 400 – 450
(d) 600-700
Answer: (b) 400 – 500
In simple words: A female Bombyx mori moth usually lays between 400 and 500 eggs in one go. This high number helps ensure the next generation of silkworms.

🎯 Exam Tip: Quantities related to life cycles, like egg-laying capacity, are common factual questions.

 

Question 14. What is the length of matured silkworm?
(a) 7.5 cm
(b) 7cm
(c) 8.5 cm
(d) 8 cm
Answer: (a) 7.5 cm
In simple words: A fully grown silkworm is about 7.5 centimeters long. This is their size before they start making a cocoon.

🎯 Exam Tip: Pay attention to specific measurements and characteristics of organisms important in economic practices.

 

Question 15. What would be the length of silk fibre in a cocoon?
(a) 1000-1100 m
(b) 1000-1200 m
(c) 1000-1500m
(d) 1000-1300m
Answer: (b) 1000 – 1200m
In simple words: Each silkworm cocoon contains a very long continuous silk thread, usually between 1000 and 1200 meters. This single long thread is key for silk reeling.

🎯 Exam Tip: Remember that silk fiber from a single cocoon is a continuous filament, and its length is a significant factor in silk production.

 

Question 16. What is meant by mariculture?
(a) Rearing of mulberry plants
(b) Rearing of castor plants
(c) Vermiculture
(d) Apiculture
Answer: (a) Rearing of mulberry plants
In simple words: Mariculture is the practice of growing mulberry plants, which are the main food for silkworms. This cultivation is essential for sericulture.

🎯 Exam Tip: Do not confuse 'mariculture' (related to the sea) with 'moriculture' (mulberry cultivation). In this context, the question uses "mariculture" but the options clearly point to "moriculture". Always clarify based on the options if there's a typo in the question itself.

 

Question 17. What is meant by voltinism?
(a) No of broods raised
(b) Cocoon
(c) Spinneret
(d) None of the options
Answer: (a) No of broods raised
In simple words: Voltinism refers to how many times a species of silkworm can complete its life cycle and produce a batch of offspring (broods) in a year. This number changes based on the species and environment.

🎯 Exam Tip: Voltinism directly impacts the silk production cycle and is a key characteristic of different silkworm breeds.

 

Question 18. What is the ideal period for mulberry culture?
(a) January, February, and November, December
(b) March, April and June, July
(c) June, July, and Nov, December
(d) October, November and December, January
Answer: (c) June, July, and Nov, December
In simple words: The best times to grow mulberry plants are in the months of June, July, November, and December. These periods ensure good leaf growth for silkworms.

🎯 Exam Tip: Optimal growing periods for host plants are important for successful sericulture.

 

Question 19. Find the odd one out.
(a) Healthy silk moths are allowed to mate for 4 hours
(b) Female lays about 400 eggs in 24 hours
(c) The small larvae hatch between 7-10 days after incubation
(d) The optimum temperature for rearing silk moth is 25°C – 30°C
Answer: (d) The optimum temperature for rearing silk moth is 25°C – 30°C
In simple words: All the options describe normal stages or conditions in a silk moth's life cycle, except for the temperature range. The rearing temperature is typically for the larvae, not the silk moth itself.

🎯 Exam Tip: Carefully read each statement in "odd one out" questions, looking for the one that contradicts established biological facts or practices.

 

Question 20. Silkmoth matured in about days
(a) 40 days
(b) 45 days
(c) 50 days
(d) 35 days
Answer: (b) 45 days
In simple words: A silkworm takes about 45 days to grow from a tiny larva into a mature silkmoth. This includes the larval and pupal stages before emergence.

🎯 Exam Tip: The maturation period is a crucial time frame in the silkworm life cycle, affecting production schedules.

 

Question 21. The cocoon is soaked in hot water in temperature for minutes.
(a) 95°C – 97°C -10 -15 minute
(b) 95°C – 97°C – 5 -10 minutes
(c) 90°C – 95°C – 7 -10 minutes
(d) 100°C – 105°C – 2 – 5 minutes
Answer: (a) 95°C – 97°C -10 -15 minute
In simple words: Silk cocoons are dipped in hot water between 95°C and 97°C for 10 to 15 minutes. This process helps soften the gum that holds the silk thread together, making it easier to unwind.

🎯 Exam Tip: Precision in temperature and time is critical in silk reeling to avoid damaging the delicate silk fiber.

 

Question 22. The areas where a lot of beehives can be placed.
(a) Honey culture
(b) Apiculture
(c) Apiaries
(d) All of the options
Answer: (c) Apiaries
In simple words: An apiary is a specific place where many beehives are kept, usually for honey production or bee breeding. It is essentially a bee farm.

🎯 Exam Tip: Understand the specific terminology used in different animal husbandry practices, like 'apiary' for bees and 'sericulture' for silkworms.

 

Question 23. The nectar got from the flowers is converted into honey by the enzyme.
(a) Invertase
(b) Zymase
(c) Lipase
(d) None of the options
Answer: (a) Invertase
In simple words: Bees use an enzyme called invertase to change the nectar from flowers into honey. This enzyme breaks down sugars in the nectar.

🎯 Exam Tip: Key enzymes and their functions in biological processes, especially those related to product formation, are important to remember.

 

Question 24. Find whether the following is true or false and find the correct sequence.
I) There is only one queen bee in a colony
II) Worker bees are around 5000 – 10000
III) The queen bee in its lifetime in 2 – 4 years lays 20 lakhs eggs.
IV) When the queen loses its fertility another worker bee becomes a queen by taking royal Jelly.
(a) I – true, II – False, III – False, IV – true
(b) I – true, II – False, III – true, IV – True
(c) I – false, II – true, III – true, IV – true
(d) I – false, II – true, III – false, IV – false
Answer: (a) I – true, II – false, III -false, IV – true.
In simple words: Only one queen bee lives in a colony. There are many more worker bees than 5000-10000; the queen lays millions of eggs, not just 20 lakhs, over her lifetime. If the queen can't lay eggs anymore, another worker can become a new queen by eating royal jelly.

🎯 Exam Tip: Thoroughly understand the social structure and reproductive aspects of a bee colony to distinguish between true and false statements.

 

Question 25. How many days are needed for the worker bee to becoming mature done?
(a) 15 days
(b) 21 days
(c) 20 days
(d) 18 days
Answer: (b) 21 days
In simple words: A worker bee takes about 21 days to grow from an egg to a fully mature adult bee. This development happens inside the hive.

🎯 Exam Tip: Knowing the development periods for different bee castes is key to understanding bee colony dynamics.

 

Question 26. What is the life span of a worker bees?
(a) 6 weeks
(b) 5 weeks
(c) 7 weeks
(d) 3 weeks
Answer: (a) 6 weeks
In simple words: A worker bee typically lives for about 6 weeks. Their short life is filled with many tasks to support the colony.

🎯 Exam Tip: Distinguish between the life spans of queen, drone, and worker bees, as they differ significantly.

 

Question 27. What are drones?
(a) a male bee from unfertilised egg
(b) a female bee from fertilised egg
(c) a queen bee from fertilised egg
(d) a worker bee after eating royal jelly becomes a queen
Answer: (a) a male bee from unfertilised egg
In simple words: Drones are male bees that hatch from eggs that have not been fertilized. Their main role is to mate with the queen.

🎯 Exam Tip: Remember the genetic origin of drones (unfertilized eggs) distinguishes them from queens and workers (fertilized eggs).

 

Question 28. Find the wrong pair?
(a) Drone cell – Comb queen bee
(b) King of honeycomb – Drone
(c) Swarming - Worker bee flying with the queen bee
(d) Male bee – After mating it will die
Answer: (a) Drone cell – Comb queen bee
In simple words: A drone cell is where drones grow, not where queen bees are found. Queen bees grow in special queen cells. This pairing is incorrect.

🎯 Exam Tip: Be familiar with the specific structures and roles of each bee type within a colony to avoid common misidentifications.

 

Question 43. Where are pearl oysters seen?
(a) Kanyakumari coastal region a Bay of Kutch
(b) Rameshwaram coastal area and Bay of Mannar
(c) Nagapatinum coastal area and Thoothukudi
(d) Visahapatinum coastal area and Chennai
Answer: (a) Kanyakumari coastal region a Bay of Kutch
In simple words: Pearl oysters are commonly found in the coastal area of Kanyakumari and the Bay of Kutch in India. This region provides a suitable habitat for their growth and pearl production.

🎯 Exam Tip: Remember specific geographical locations related to unique marine life or agricultural practices as they often appear in questions.

 

Question 44. The pearl oysters belongs to 'L' genus produce Quality pearls.
(a) Gastropoda
(b) Pinctata
(c) Pelecypoda
(d) Cephalopoda
Answer: (b) Pinctata
In simple words: The genus 'Pinctata' is known for producing high-quality pearls. It is important to know the scientific names associated with valuable economic zoology products.

🎯 Exam Tip: When dealing with biological classifications, pay attention to the genus and species names, especially for economically important organisms.

 

Question 45. ___________ ulturing pearl in freshwater.
(a) Lamellidens
(b) Mytilus
(c) Loligo
(d) Dentalium
Answer: (a) Lamellidens
In simple words: Lamellidens is a type of mussel that is used for growing pearls in freshwater environments. This is different from marine pearl oysters.

🎯 Exam Tip: Distinguish between organisms used for freshwater and saltwater aquaculture, as their types often differ significantly.

 

Question 46. The marine oysters are composed of
(a) Calcium carbonate
(b) Sodium carbonate
(c) Potassium carbonate
(d) Magnesium carbonate
Answer: (a) Calcium carbonate
In simple words: Marine oysters build their shells and pearls using calcium carbonate, a common mineral. This substance gives pearls their hardness and shine.

🎯 Exam Tip: Understand the basic chemical composition of biological structures like shells and pearls; calcium carbonate is a key component for many marine organisms.

 

Question 47. The process of killing the silkworm cocoons is called
(a) Reeling
(b) Stifling
(c) Spinning
(d) rearing
Answer: (b) Stifling
In simple words: Stifling is the process where silkworm cocoons are killed, usually by heat, before the moth can emerge. This keeps the silk thread long and unbroken.

🎯 Exam Tip: Be familiar with key terms and processes in sericulture, such as stifling, reeling, and spinning, as they are fundamental to silk production.

 

Question 48. Assertion A: The pearl oysters got from the sea are valuable
Reason B: The pearl oysters got from freshwater is not valuable
(a) Assertion A true, B false
(b) Assertion A and B reason all true
(c) Assertion A false, Reason B true
(d) Assertion A and B are false
Answer: (b) Assertion A and B reason all true
In simple words: Pearls from marine oysters are generally more valuable, and pearls from freshwater sources are usually less valuable. Both of these statements are considered true.

🎯 Exam Tip: In assertion-reason questions, assess each statement's truth value independently, then determine if the reason correctly explains the assertion.

 

Question 49. What is the name of the breed that produces mule?
(a) Outbreeding
(b) Crossbreeding
(c) Interspecific hybridization
(d) Outbreeding
Answer: (c) Interspecific hybridization
In simple words: A mule is made by mixing two different species, a male donkey and a female horse. This special type of mixing is called interspecific hybridization.

🎯 Exam Tip: Understand the different types of animal breeding; interspecific hybridization involves breeding between different species, producing a hybrid like a mule.

 

Question 50. Assertion X: 6 – 8 eggs can be produced by induction in an artificial method
Reason Y: The embryos at 8 – 32 celled stages are transferred to a surrogate mother.
(a) Assertion x false y true
(b) Assertion X true, Y false
(c) Assertion X false, Y false
(d) Assertion X and Y are true
Answer: (d) Assertion X and Y are true
In simple words: Both statements are correct. In artificial breeding, 6 to 8 eggs can be created, and then these young embryos, which are 8 to 32 cells big, are placed into another mother animal.

🎯 Exam Tip: Ensure you know the exact steps and typical numbers involved in artificial breeding techniques like MOET (Multiple Ovulation Embryo Transfer).

 

Question 51. Which of the cattle breed yields more milk than what they eat?
(a) Vechur
(b) Kankeyem
(c) Gir
(d) Ongole
Answer: (a) Vechur
In simple words: The Vechur cow breed is known for producing a lot of milk even when it eats less food. This makes them very efficient for milk production.

🎯 Exam Tip: Focus on the specific characteristics and advantages of different cattle breeds, especially those known for efficiency or high yields.

 

Question 52. Which of the following is not a milch breed?
(a) Sindhi
(b) Malvi
(c) Jersey
(d) Gir
Answer: (b) Malvi
In simple words: The Malvi breed of cattle is not primarily used for milk production. Sindhi, Jersey, and Gir are all known for their milk yield.

🎯 Exam Tip: Memorize examples of milch (milk-producing) breeds and draught (work-purpose) breeds to differentiate them accurately.

 

Question 53. Which of the following belongs to America?
(a) Silkie
(b) White Plymouth rock
(c) Chittagong
(d) Aseel
Answer: (b) White Plymouth rock
In simple words: The White Plymouth Rock is a type of chicken breed that came from America. Other options like Silkie, Chittagong, and Aseel are from other parts of the world.

🎯 Exam Tip: When studying poultry, remember the origin of important breeds, as questions often test this knowledge.

 

Question 54. Name the poultry which is noted for its pugnacity?
(a) Leghorn
(b) Silkie
(c) Brahma
(d) Aseel
Answer: (d) Aseel
In simple words: Aseel is a type of chicken breed famous for being very aggressive and spirited. This quality is called pugnacity, making them popular for cockfighting.

🎯 Exam Tip: Relate specific traits (like pugnacity) to their corresponding poultry breeds to answer such characteristic-based questions.

 

Question 55. Find the odd one out
(a) Leghorn – Italy
(b) Chittagong - good egg yielder
(c) White Plymouth rock – American breed
(d) Aseel-ornamental breed
Answer: (d) Aseel – ornamental breed
In simple words: The odd one out is Aseel being an ornamental breed, as it is primarily known for its fighting qualities and meat, not just its looks. The other options correctly describe the breed and a key characteristic or origin.

🎯 Exam Tip: Always double-check each pairing in "odd one out" questions; sometimes, the incorrect pairing is subtle.

 

Question 56. Which among the following is a wild duck?
(a) Syhlet
(b) Muscori
(c) Pekin
(d) Mallard
Answer: (d) Mallard
In simple words: The Mallard is a type of duck that lives in the wild. Other options like Pekin are domestic breeds, meaning they are raised by people.

🎯 Exam Tip: Differentiate between wild and domestic animal species. Wild species often retain their natural characteristics and habitats.

 

Question 57. Find the wrong statement about Duck.
(a) The body is covered with oily feathers.
(b) The fat layer beneath their skin prevents it from getting wet
(c) They lay eggs at mid-day
(d) The ducks feed on rice bran kitchen wastes and snails
Answer: (c) They lay eggs at midday
In simple words: The wrong statement is that ducks lay eggs at midday. Ducks usually lay their eggs either at night or early in the morning, not in the middle of the day.

🎯 Exam Tip: Pay close attention to negative questions like "wrong statement" or "not true," as they require careful reading of all options.

 

II. Very Short Answer (2 marks)

 

Question 1. What is Economic Zoology?
Answer: Economic zoology is a part of science that studies animals which are useful to humans in different ways. It looks at how animals can be used for people's benefit.
In simple words: Economic zoology is the study of useful animals and how they help humans.

🎯 Exam Tip: Define key terms clearly and concisely. For a full answer, you might also add one example of an economically useful animal.

 

Question 2. How are animals classified on the basis of their economic importance?
Answer: Animals are grouped based on how they are important to the economy in several ways:

• Animals that provide food and food products.
• Animals that are helpful to the economy in other ways.
• Animals that are important for their beauty or appearance.
• Animals used for scientific research.

In simple words: Animals are grouped by their economic value, such as for food, general benefits, beauty, or research.

🎯 Exam Tip: When listing classifications or types, use clear bullet points for readability and to ensure all points are covered.

 

Question 3. Name the endemic earthworms of India.
Answer: The earthworm species that are naturally found in India include:
1. Perionyx excavatus
2. Lampito mauritii
3. Octochaetona serrata
In simple words: Some earthworms found only in India are Perionyx excavatus, Lampito mauritii, and Octochaetona serrata.

🎯 Exam Tip: For naming specific examples, ensure correct spelling and list them clearly, often using numbered points as in the original source.

 

Question 4. Name the exotic species of an earthworm?
Answer: Earthworm species that are not native to India but brought from other places are:

• Eisenia fetida
• Eudrilus eugeniae

In simple words: Earthworms like Eisenia fetida and Eudrilus eugeniae are not from India but are brought in.

🎯 Exam Tip: Distinguish between endemic (native) and exotic (introduced) species, as questions may test your knowledge of both.

 

Question 5. Why are earthworms called 'friends of farmers'?
Answer: Earthworms are called 'friends of farmers' because they are very important for keeping soil healthy and fertile. They break down dead organic matter, making the soil rich in nutrients. They also make the soil porous, allowing air and water to move easily, which helps plants grow better.
In simple words: Earthworms help soil stay fertile and airy, so farmers call them friends. They break down waste and mix the soil.

🎯 Exam Tip: When explaining "why" questions, provide clear reasons and elaborate slightly on each point to ensure a comprehensive answer.

 

Question 6. What decides the economic success of the industries?
Answer: The economic success of industries depends on a few things:

• It relies on the animals being raised and the products they make.
• It also depends on how well the production is managed and if the next generation of farm animals is developed properly.

In simple words: Industry success depends on good animals, their products, and smart management of their breeding.

🎯 Exam Tip: Focus on the factors that influence economic outcomes in animal-based industries, typically involving both biological and managerial aspects.

 

Question 7. What is meant by vermiculture?
Answer: Vermiculture is the process of using earthworms to break down organic food waste into a material rich in nutrients. This nutrient-rich material helps plants grow and keeps the soil healthy.
In simple words: Vermiculture is using earthworms to turn waste into plant food.

🎯 Exam Tip: Define scientific terms precisely. For definitions, ensure you mention both the agent (earthworm) and the purpose (decompose waste, create nutrient-rich material).

 

Question 8. What is meant by vermicast?
Answer: Vermicast is the nutrient-rich manure produced when earthworms decompose organic matter in the soil. It is essentially pure worm waste that greatly benefits plant growth.
In simple words: Vermicast is the rich fertilizer made by earthworms from broken-down soil.

🎯 Exam Tip: Clearly distinguish between vermiculture (the process) and vermicast (the product). Both terms are distinct and important.

 

Question 9. What is meant by vermicompost?
Answer: Vermicompost is a mix of vermicast (worm waste) and other organic materials. It contains important nutrients, plant growth promoters, and organic substances that are very good for plants.
In simple words: Vermicompost is a fertilizer made from worm castings and other organic stuff, full of plant food.

🎯 Exam Tip: Note that vermicompost is a broader term, often including vermicast along with other decomposed organic material.

 

Question 10. What is meant by vermitech?
Answer: Vermitech refers to using earthworms in composting technology and for cleaning up contaminated soil (bioremediation), along with other related activities. It's a technology that uses earthworms for environmental benefits.
In simple words: Vermitech is a method using earthworms to compost waste and clean soil.

🎯 Exam Tip: Understand that "vermitech" represents the broader application of vermiculture principles in various technologies.

 

Question 11. What are the pests of earthworms?
Answer: Earthworms have various pests and predators that feed on them or harm them. These include:

• Ants
• Springtails
• Centipedes
• Slugs
• Mites
• Certain beetle larvae
• Birds
• Rats
• Snakes
• Mice
• Toads

In simple words: Ants, slugs, birds, rats, and snakes are some common pests and predators that harm earthworms.

🎯 Exam Tip: When listing multiple items, ensure you include a good number of examples to demonstrate comprehensive knowledge.

 

Question 12. What are the special characters of vermicompost?
Answer: Vermicompost has several special qualities that make it beneficial:

• It provides good aeration to the soil.
• It helps in draining excess water from the soil.
• It helps the soil retain water better.

In simple words: Vermicompost makes soil airy, helps water drain, and holds water well.

🎯 Exam Tip: For characteristics, list distinct benefits. Focus on how vermicompost physically and chemically improves soil.

 

Question 13. What is meant by vermiwash?
Answer: Vermiwash is a liquid fertilizer collected after water passes through a vermibed (where earthworms live). This liquid is used as a foliar spray to help plants grow better and improve crop yields.
In simple words: Vermiwash is a liquid fertilizer from worm beds that helps plants grow when sprayed.

🎯 Exam Tip: Differentiate vermiwash from vermicompost; one is a liquid extract, the other is a solid compost, both used for plant nutrition.

 

Question 14. What is sericulture?
Answer: Sericulture is an agriculture-based industry that involves the commercial production of silk by rearing silkworms. It includes all the processes from cultivating mulberry plants to obtaining silk.
In simple words: Sericulture is the business of raising silkworms to make silk.

🎯 Exam Tip: Define sericulture by mentioning both the organism (silkworms) and the product (silk) for a complete definition.

 

Question 15. What is meant by sericulture?
Answer: Sericulture specifically refers to the commercial farming of silkworms to produce silk threads. This involves a whole process of caring for the silkworms and processing their cocoons.
In simple words: Sericulture is the commercial growing of silkworms to make silk.

🎯 Exam Tip: Understand that sericulture is a complete cycle, from feeding the silkworms to extracting the silk, highlighting its industrial aspect.

 

Question 16. What is meant by moriculture?
Answer: Moriculture is the practice of cultivating mulberry plants, which are used as food for silkworms. The quality of silk largely depends on the quality of mulberry leaves.
In simple words: Moriculture is growing mulberry plants to feed silkworms.

🎯 Exam Tip: Note the distinction between moriculture (cultivating food for silkworms) and sericulture (rearing silkworms for silk), as they are related but distinct processes.

 

Question 17. Which is the suitable period for mulberry cultivation?
Answer: The ideal time for cultivating mulberry plants is during the months of June, July, November, and December. These periods offer favorable conditions for their growth.
In simple words: Mulberry plants grow best in June, July, November, and December.

🎯 Exam Tip: Remember specific timings or seasons for agricultural practices, as they can be crucial for crop success.

 

Question 18. What are the stages involved in rearing process of silk worm?
Answer: The main stages in raising silkworms are:
1. Disinfection of the rearing house to keep it clean and healthy for the silkworms.
2. Incubation of eggs to hatch them into larvae.
3. Brushing, which is the process of transferring newly hatched young larvae to feeding trays.
4. Rearing the larvae until they are ready to spin cocoons.
5. Late age larval rearing, which involves feeding the larger larvae until they mature.
In simple words: Silkworm rearing includes cleaning the house, hatching eggs, moving young worms, and feeding them until they grow big.

🎯 Exam Tip: List the stages in chronological order and briefly explain what happens in each stage to show a complete understanding of the process.

 

Question 19. What is meant by stifling?
Answer: Stifling is the process of killing silkworm cocoons using heat, such as hot water or steam. This is done to prevent the moth from emerging and breaking the silk filament, which would make the silk thread shorter and less valuable.
In simple words: Stifling means killing silkworm cocoons with heat to keep the silk thread long and useful.

🎯 Exam Tip: Explain the 'why' behind the process (to preserve silk length) in addition to defining 'what' it is.

 

Question 20. What is meant by reeling?
Answer: Reeling is the process of carefully unwinding the silk threads from the stifled cocoons. These threads are then collected into skeins, preparing them for further processing. This step requires skill to avoid breaking the delicate silk.
In simple words: Reeling is pulling the long silk threads off the cocoons.

🎯 Exam Tip: Understand reeling as the step where the silk thread is actually extracted from the cocoon after stifling.

 

Question 21. What is cooking?
Answer: In sericulture, cooking refers to the process of soaking silkworm cocoons in hot water, usually at 95°-97°C for 10-15 minutes. This softens the gum (sericin) that binds the silk threads together, making it easier to reel the silk. Soaking helps in unwinding the continuous filament.
In simple words: Cooking is soaking cocoons in hot water to soften the glue and make silk easier to unwind.

🎯 Exam Tip: Always include the temperature and duration if specified for a process, as this shows precise knowledge.

 

Question 22. What are Uzi files?
Answer: "Uzi files" appears to be a misinterpretation or typo for "Uzi flies." Uzi flies (Exorista bombycis) are parasitic flies that attack silkworms, laying their eggs on them and causing damage to the silk industry. These files are a significant threat to silkworm crops.
In simple words: Uzi flies are tiny insects that attack silkworms and harm silk production.

🎯 Exam Tip: Be aware of common pests and diseases in economic zoology, as their impact can be significant on related industries.

 

Question 23. What is meant by cooking?
Answer: In the context of sericulture, cooking is the process where silkworm cocoons are submerged in hot water (typically 95°-97°C for 10-15 minutes). This action softens the sericin gum, which holds the silk fibers together, allowing for the easy unwinding of the silk threads during reeling. This step is crucial for efficient silk extraction.
In simple words: Cooking means putting silk cocoons in hot water to soften their glue so the silk threads can be unwound easily.

🎯 Exam Tip: Clearly state the purpose of each step in the sericulture process. For "cooking," emphasize softening the gum and facilitating reeling.

 

Question 24. What is spun silk?
Answer: Spun silk is a type of silk thread produced from silk waste, such as damaged cocoons or short fibers that cannot be reeled. These shorter fibers are spun together, similar to how cotton or wool is spun, to create a new thread. It's an important way to use all parts of the silk production.
In simple words: Spun silk is thread made from leftover or short silk fibers, just like spinning other materials.

🎯 Exam Tip: Understand that not all silk comes from continuous filaments; spun silk is a valuable product derived from what would otherwise be waste.

 

Question 25. What are apiaries?
Answer: Apiaries are places where many beehives are kept for beekeeping (apiculture). These areas are chosen carefully to provide a good environment for honey bees, including plenty of flowers for nectar and pollen. Apiaries are essential for honey production.
In simple words: Apiaries are special places where many beehives are kept for making honey.

🎯 Exam Tip: Define apiaries as the location for beekeeping, emphasizing that they are designed to support honey production.

 

Question 26. Name the bees used for Apiculture.
Answer: Several species of bees are commonly used in apiculture (beekeeping), each with different characteristics:

• Apis dorsata – known as the Rock bee
• Apis florea – known as the Little bee
• Apis indica – known as the Indian bee
• Apis mellifera – known as the European bee
• Apis adamsoni – known as the African bee

In simple words: Bees like Rock bee, Little bee, Indian bee, European bee, and African bee are used for beekeeping.

🎯 Exam Tip: Be able to list both the scientific and common names of bee species important in apiculture, especially differentiating native vs. introduced ones.

 

Question 27. Name the types of beehives which are in practice in India?
Answer: In India, two main types of beehives are commonly used for beekeeping:

• Langstroth hive
• Newton hive

These hives are designed to be efficient for honey production and bee management.
In simple words: In India, Langstroth and Newton are the two common types of beehives used.

🎯 Exam Tip: When asked for types or examples, provide at least two distinct items and ensure their names are spelled correctly.

 

Question 28. What is meant by swarming?
Answer: Swarming is when a large group of honey bees, including the old queen bee, leaves their original hive to find a new home. This is a natural way for bee colonies to reproduce and expand. They move together in a dense cluster.
In simple words: Swarming is when many bees, with their old queen, leave their hive to start a new one.

🎯 Exam Tip: Define swarming as a natural reproductive process for bee colonies, involving the departure of a portion of the colony.

 

Question 29. What is meant by nuptial flight?
Answer: Nuptial flight is a special flight taken by a virgin queen bee, where she mates with several male bees (drones) high in the air. This is the only time the queen bee mates in her life, and it ensures the fertilization of her future eggs. This flight ensures genetic diversity.
In simple words: Nuptial flight is when a young queen bee flies high to mate with many male bees.

🎯 Exam Tip: Emphasize that nuptial flight is a singular, crucial event for the queen bee's reproductive life, involving mating with multiple drones.

 

Question 30. Which is called as king of the colony? Why is called so?
Answer: The drone (male bee) is sometimes called the 'king of the colony.' This is because its main role is to fertilize the queen bee during her nuptial flight. Without the drone, the queen cannot lay fertilized eggs, which are needed for new worker bees to be born and continue the colony. However, the queen truly runs the colony.
In simple words: The male bee, or drone, is called the 'king' because it fertilizes the queen. This is its most important job for the colony to continue.

🎯 Exam Tip: When a question asks "why," provide the reasoning clearly. For drones, highlight their singular, vital reproductive function.

 

Question 31. Name the sugar component present in the honey?
Answer: Honey mainly contains two types of sugars:

• Levulose (also known as fructose)
• Dextrose (also known as glucose)

These sugars give honey its sweetness and energy content. Other sugars are also present but in smaller amounts.
In simple words: Honey has two main sugars: levulose and dextrose.

🎯 Exam Tip: For chemical composition questions, list the primary components. Knowing alternative names (fructose/glucose) is also beneficial.

 

Question 32. What are the uses of honey?
Answer: Honey has many uses:

• It acts as an antiseptic, meaning it can help prevent infections.
• It can be used as a laxative, helping with bowel movements.
• It has sedative properties, which can help calm and soothe.
• It is used in preparing baked goods like cakes and biscuits, adding sweetness and moisture.

Honey is a versatile natural product.
In simple words: Honey can fight germs, help digestion, calm you, and is used in baking.

🎯 Exam Tip: Provide a diverse range of uses, covering medicinal, culinary, and other practical applications, to show comprehensive knowledge.

 

Question 33. What is meant by Lac culture?
Answer: Lac culture is the technique of cultivating lac insects on a large scale to produce lac. Lac is a resinous substance used in many industries, and its production involves specific methods of rearing these insects on host plants.
In simple words: Lac culture is growing lac insects to make lac on a big scale.

🎯 Exam Tip: Similar to sericulture, define lac culture by stating the organism (lac insect) and the product (lac resin).

 

Question 34. Name the host plants on which Lac insects live?
Answer: Lac insects live and feed on several host plants. Some common examples include:

• Karanagalli
• Acacia catechu
• Karuvelai (Acacia nilotica)
• Kumbadiri (Schleichera oleosa)

These plants provide the sap that the lac insects consume to produce lac resin.
In simple words: Lac insects live on plants like Karanagalli, Acacia catechu, Karuvelai, and Kumbadiri.

🎯 Exam Tip: List specific examples of host plants. Knowing both common and scientific names (if provided) is a plus.

 

Question 35. What is meant by hyper parasitism?
Answer: Hyper parasitism is a condition where a parasite itself is infected by another parasite. This means a secondary parasite develops inside or on a parasite that is already living on a host. For example, some caterpillars feed on lac insects, which are already parasites.
In simple words: Hyper parasitism is when a parasite gets infected by another parasite.

🎯 Exam Tip: Define hyper parasitism by explaining the chain of parasitism (parasite on a parasite) and provide a clear example if possible.

 

Question 36. What is meant by inoculation?
Answer: In lac culture, inoculation is the process of intentionally introducing lac insects to new host plants. This helps to start new lac crops and ensure the continuous production of lac resin.
In simple words: Inoculation means putting lac insects onto plants to start growing more lac.

🎯 Exam Tip: Relate the term "inoculation" specifically to lac culture and its purpose in initiating lac production.

 

Question 37. What is meant by Harvesting?
Answer: In the context of lac culture, harvesting refers to the collection of lac resin from the host plants once it has been fully produced by the lac insects. This is done at a specific time to maximize the yield and quality of the lac.
In simple words: Harvesting means collecting the lac from the plants after the insects have made it.

🎯 Exam Tip: Provide context for general terms like "harvesting" by explaining what is being harvested and from where in a specific industry.

 

Question 38. What is meant by 'Arilac'?
Answer: Arilac is the name given to the lac produced by immature lac insects. This lac is harvested before the insects fully mature, and it has specific qualities that differentiate it from lac produced by mature insects.
In simple words: Arilac is the lac made by young lac insects, harvested before they fully grow up.

🎯 Exam Tip: Learn specific terminology related to different stages of lac production, such as 'arilac' for immature lac.

 

Question 39. What is meant by sticklac?
Answer: Sticklac refers to the lac resin that is scraped or cut directly from the host plant branches. It still contains parts of the plant and dead insect bodies, making it the rawest form of lac before any processing. This form is the first step in processing lac.
In simple words: Sticklac is raw lac that is cut from plant branches, still mixed with plant bits and insect remains.

🎯 Exam Tip: Understand that sticklac is the initial, unprocessed form of lac, directly obtained from the host plant.

 

Question 40. What is seed Lac?
Answer: Seed lac is the form of lac that is obtained after sticklac has been scraped, collected, ground, and had its dust particles removed. It's a cleaner, granular form of lac that resembles small seeds, hence the name 'seed lac'. It is further processed to make shellac.
In simple words: Seed lac is clean, small pieces of lac left after raw lac is ground and dust is removed.

🎯 Exam Tip: Trace the progression of lac processing: sticklac (raw) to seed lac (cleaned and ground) to shellac (melted and processed).

 

Question 41. What is meant by Shellac?
Answer: Shellac is a refined form of lac, produced by sundrying seed lac and then melting it. This melting process removes impurities and allows the resin to be spread into thin sheets or flakes, which is what 'shellac' typically refers to. Shellac is used as a varnish, polish, and food glaze.
In simple words: Shellac is a clean, melted form of lac that is dried into thin sheets for use as a polish or varnish.

🎯 Exam Tip: Recognize shellac as the final, most refined product in the lac processing chain, and know its primary uses.

 

Question 42. What is meant by aqua ponies?
Answer: Aquaponics is a unique farming method that combines raising aquatic animals (like fish) with growing plants in water, without soil. It creates a closed system where fish waste provides nutrients for the plants, and the plants help clean the water for the fish. This method helps to grow food efficiently with less water.
In simple words: Aquaponics is a system where fish and plants grow together, with fish waste feeding the plants and plants cleaning the water.

🎯 Exam Tip: Remember to highlight the "combination" aspect of aquaculture and hydroponics, as this is the core definition of aquaponics.

 

Question 43. What are the organisms farming through aqual culture?
Answer: In aquaculture, many different organisms are farmed, including various types of fish, molluscs (like oysters and mussels), crustaceans (like prawns and crabs), and aquatic plants. These are grown in controlled water environments to produce food and other valuable products. It's an important way to provide food for a growing population.
In simple words: Aquaculture farms fish, shellfish, crabs, and water plants.

🎯 Exam Tip: When listing organisms, try to give at least three distinct categories or examples to show comprehensive understanding.

 

Question 44. How aquaculture is classified on the basis of its source?
Answer: Aquaculture can be classified into three main types based on the water source used:

• Freshwater aquaculture: This involves farming aquatic organisms in non-saline environments like ponds, rivers, and lakes.
• Brackish water aquaculture: This type uses water that is a mixture of fresh and saltwater, often found in estuaries or coastal lagoons.
• Marine water aquaculture: This focuses on farming organisms in the ocean or in tanks using saltwater. It helps meet the demand for seafood sustainably.

In simple words: Aquaculture is classified by its water source: fresh water, brackish water (mixed), or marine water (salt water).

🎯 Exam Tip: Clearly define each type of aquaculture by its water source to differentiate them effectively.

 

Question 45. What is meant by Brackish water culture?
Answer: Brackish water culture involves raising aquatic animals in water that has a salinity range from 0.5 to 30 parts per thousand (ppt). This type of water is typically found in estuaries, mangrove areas, and coastal lagoons where freshwater mixes with seawater. Organisms in these environments must be able to adapt to fluctuating salt levels.
In simple words: Brackish water culture is farming animals in water that is a mix of fresh and salt, with specific salt levels.

🎯 Exam Tip: Include the salinity range (0.5 – 30ppt) in your definition as it is a key characteristic of brackish water.

 

Question 46. Name the fishes cultured through brackish water culture?
Answer: Some common fishes cultured using brackish water techniques include Milkfish, Sea bass, Grey mullet, and Kari meen. These fish species are well-suited to the fluctuating salinity levels found in brackish environments, making them ideal for such farming. Their ability to adapt makes them valuable for aquaculture.
In simple words: Milkfish, Sea bass, Grey mullet, and Kari meen are some fishes grown in brackish water.

🎯 Exam Tip: List at least three specific examples to score full marks for this type of question.

 

Question 47. What is meant by metahaline culture?
Answer: Metahaline culture is a specialized form of aquaculture that involves raising animals in water with very high salinity levels, ranging from 36 to 400 parts per thousand (%). A prime example of an organism cultured in these extreme conditions is *Artemia salina*, a brine shrimp known for its ability to thrive in such environments. These high-saline conditions often limit the types of organisms that can survive.
In simple words: Metahaline culture means growing animals in very salty water, like brine shrimp.

🎯 Exam Tip: Define the high salinity range and provide an example like *Artemia salina* to illustrate metahaline culture.

 

Question 48. What are the organisms rearing through aquaculture?
Answer: Aquaculture involves raising a variety of organisms in water environments. The main groups reared are:

1. Molluscs: Such as oysters, clams, and mussels.
2. Aquatic plants: Including various seaweeds and freshwater plants.
3. Crustaceans: Like prawns, shrimps, and crabs.

Fish are also a major part of aquaculture, providing a significant food source globally.
In simple words: Aquaculture raises molluscs, water plants, and crustaceans.

🎯 Exam Tip: Categorizing the organisms (molluscs, plants, crustaceans) provides a clear and structured answer.

 

Question 49. Give notes on fishes of brackish water?
Answer: Brackish water fishes are species that can live in water with a mix of fresh and salt. These fish typically spend most of their lives in areas where rivers meet the sea, such as river mouths, backwaters, mangrove swamps, and coastal lagoons. They have special adaptations that allow them to handle changes in water salinity. These unique habitats are crucial for their survival.
In simple words: Brackish water fish live where fresh and salt water mix, like river mouths and mangroves.

🎯 Exam Tip: Focus on the specific habitats and the ability to tolerate varying salinity when describing brackish water fishes.

 

Question 50. What is meant by mariculture?
Answer: Mariculture is the specialized branch of aquaculture that deals with cultivating marine organisms in seawater, either in enclosed sections of the ocean, open ocean cages, or in artificial tanks filled with seawater. The water salinity range for mariculture is typically around 35 parts per thousand (%). This practice contributes significantly to global seafood production.
In simple words: Mariculture is farming marine animals in salt water, like the ocean.

🎯 Exam Tip: Distinguish mariculture by its exclusive use of marine (salt) water and its typical salinity range.

 

Question 51. Give short notes on Artemia salina?
Answer: *Artemia salina*, also known as brine shrimp, is an organism that thrives in extremely saline (metahaline) waters. It is capable of living in high salt concentrations due to its high osmoregulatory capacity, which means it can effectively control the balance of water and salts in its body. This unique ability makes it a valuable species for aquaculture as feed for other aquatic animals.
In simple words: *Artemia salina* (brine shrimp) lives in very salty water because it can control its body's salt levels.

🎯 Exam Tip: Mentioning its "high osmoregulatory capacity" is a key scientific term that shows a deeper understanding of its adaptation.

 

Question 52. What is meant by composite fish culture?
Answer: Composite fish culture is a farming technique where several different species of compatible fish are raised together in the same pond. These selected fish species typically have different feeding habits, ensuring that all available food resources in the pond are utilized efficiently without competition. This method helps to maximize fish production from a single water body.
In simple words: Composite fish culture means growing different types of fish together in one pond to use all food resources well.

🎯 Exam Tip: Emphasize the "different species" and "proper proportion" aspects to show how this method is efficient.

 

Question 53. What are the organisms cultured through composite fish culture?
Answer: In composite fish culture, specific types of fish are chosen based on their feeding habits to occupy different parts of the pond and consume different food sources. Common examples include:

• Catla Catla (surface feeder)
• Labeo rohita (column feeder)
• Cirrhina mirgala (bottom feeder)

These different feeding behaviors help prevent competition and allow for higher overall yields. Other compatible species may also be included depending on the specific pond ecosystem.
In simple words: Fish like Catla, Labeo rohita, and Cirrhina mirgala are grown together in composite fish culture because they eat different foods.

🎯 Exam Tip: For composite fish culture, naming specific fish types and their feeding levels (surface, column, bottom) demonstrates a detailed understanding.

 

Question 54. What is meant by exotic fish culture?
Answer: Exotic fish culture refers to the practice of raising fish species that are not native to a particular country but have been introduced from other regions for farming purposes. These imported fishes are cultivated in controlled environments. The goal is often to introduce species with desirable traits like fast growth or disease resistance, which can boost local aquaculture production.
In simple words: Exotic fish culture means raising fish from other countries in local farms.

🎯 Exam Tip: The key point for exotic fish culture is that the species are "imported" or "not native" to the area where they are being farmed.

 

Question 55. Name the exotic fishes cultured in India?
Answer: In India, some of the exotic fish species that are commonly cultured include:

• *Cyprinus carpio* (Common Carp)
• *Oreochromis mossambicus* (Tilapia)

These species were introduced for their fast growth rates and adaptability, which have significantly contributed to the country's fish production. They are popular due to their economic benefits.
In simple words: Common Carp and Tilapia (*Oreochromis mossambicus*) are exotic fish raised in India.

🎯 Exam Tip: Remember to provide both common and scientific names for exotic species if available, as it adds accuracy to your answer.

 

Question 56. What is meant by fish meal?
Answer: Fish meal is a nutritional supplement created from fish waste, which is leftover material after oil has been extracted from the fish. This by-product is rich in protein and is commonly used as a feed ingredient for livestock, poultry, and even other fish in aquaculture. It provides a sustainable way to utilize parts of fish that would otherwise be discarded.
In simple words: Fish meal is made from fish waste after oil extraction and is used as animal feed.

🎯 Exam Tip: Note that fish meal is a protein-rich by-product, highlighting its economic and nutritional importance.

 

Question 57. What is meant by Ising glass?
Answer: Isinglass is a type of high-grade collagen derived from the dried air bladder of certain fish, especially cat fish and carps. This substance is primarily used as a fining agent for clarifying liquids like wine, beer, and vinegar, by helping to remove suspended particles and make the drinks clear. Its natural properties make it an effective clarifying agent.
In simple words: Isinglass is collagen from fish air bladders, used to clarify wine and beer.

🎯 Exam Tip: Remember that Isinglass is made from the "air bladder" of fish and its main use is "clarification" of beverages.

 

Question 58. What is meant by outbreeding?
Answer: Outbreeding is a breeding method that involves mating unrelated animals. These animals do not share common ancestors for at least four to six generations. This practice helps to avoid the negative effects of inbreeding, such as reduced genetic diversity and the expression of harmful recessive genes. It helps to introduce new genetic variations.
In simple words: Outbreeding is when animals with no close family ties are bred to avoid genetic problems.

🎯 Exam Tip: The core concept of outbreeding is mating "unrelated animals" and specifically mentioning the "4-6 generations" of no common ancestry is important.

 

Question 59. What is the use of outbreeding?
Answer: Outbreeding is used to produce hybrids that have superior qualities compared to their parents, a phenomenon known as hybrid vigor. It helps in creating new breeds and introducing new, beneficial genes into a population, increasing genetic diversity and improving overall health and productivity. This method is crucial for genetic improvement in livestock.
In simple words: Outbreeding helps make stronger, better quality offspring and creates new animal breeds by bringing in fresh genes.

🎯 Exam Tip: Highlight the benefits of outbreeding, such as producing "hybrids with superior qualities" and introducing "new and favorable genes."

 

Question 60. What is meant by outcrossing?
Answer: Outcrossing is a specific type of outbreeding where breeding occurs between unrelated animals of the same breed, meaning they share no common ancestry for at least four to six generations. This technique is often used to improve traits in animals that are below average in productivity, by introducing genes from a superior, unrelated animal within the same breed. It helps maintain the characteristics of the breed while adding vigor.
In simple words: Outcrossing is breeding unrelated animals of the same breed to improve their traits.

🎯 Exam Tip: Clearly state that outcrossing involves animals of the "same breed" but with "no common ancestry" for several generations.

 

Question 61. What is meant by artificial insemination?
Answer: Artificial insemination is a breeding technique where semen collected from a desired male animal is manually inserted into the reproductive tract of a selected female. This method is widely used in livestock breeding to improve genetic quality, overcome physical mating challenges, and prevent the spread of certain diseases. It allows for the widespread use of semen from genetically superior males.
In simple words: Artificial insemination is putting male semen into a female animal without natural mating to help with breeding.

🎯 Exam Tip: The core of artificial insemination is the "manual insertion of collected semen" into the female's reproductive tract.

 

Question 62. What is meant by recovery period?
Answer: In pearl culture, the recovery period refers to the time after nucleated oysters (oysters with an inserted nucleus for pearl formation) are placed into cages and suspended in the water, typically at a depth of 2 to 3 meters. This period, lasting about 6 to 7 days, allows the oyster to recover from the stress of the nucleus insertion and begin the process of secreting nacre. A successful recovery period is vital for good pearl formation.
In simple words: Recovery period in pearl culture is when oysters heal and start making pearls after a small piece is put inside them.

🎯 Exam Tip: Specify the duration (6-7 days) and the purpose (oyster recovery and nacre secretion initiation) for the recovery period in pearl culture.

 

Question 63. What is the composition of pearl?
Answer: A pearl is primarily composed of several components that give it its luster and hardness:

• Water: Approximately 2-4% of its weight.
• Calcium carbonate: About 90%, which forms the crystalline structure of nacre.
• Organic matter: Consisting of conchiolin, making up 3.5-5.9%.
• Residue: Very small amounts, around 0.1-0.8%.

The layers of calcium carbonate and organic matter are what create the beautiful iridescent sheen of a pearl.
In simple words: Pearls are mostly made of calcium carbonate and a small amount of water and organic material.

🎯 Exam Tip: Remember that calcium carbonate (nacre) is the dominant component, responsible for the pearl's characteristic appearance.

 

Question 64. Name the species of prawn?
Answer: Several species of prawns are important in aquaculture and fisheries. Some notable species include *Penaeus indicus*, *Penaeus monodon*, *Metapenaeus dobsoni*, and *Macrobrachium rosenbergii*. These species are farmed globally due to their commercial value and high demand as seafood. Each species has unique growth characteristics.
In simple words: Important prawn species include *Penaeus indicus*, *Penaeus monodon*, *Metapenaeus dobsoni*, and *Macrobrachium rosenbergii*.

🎯 Exam Tip: List at least three specific prawn species, preferably with their scientific names, to provide a comprehensive answer.

 

Question 65. Where are pearl oysters cultured?
Answer: Pearl oysters are cultured in various coastal regions around the world where suitable marine conditions exist. In India, a significant location for pearl oyster culture is Kanyakumari Bay of Kutch. These areas typically offer the necessary sheltered waters and nutrient availability for the oysters to thrive and produce pearls. Coastal bays provide ideal environments.
In simple words: Pearl oysters are grown in coastal areas like Kanyakumari Bay of Kutch.

🎯 Exam Tip: Name a specific geographical location, like Kanyakumari Bay of Kutch, to make your answer precise.

 

Question 66. What is meant by Linga pearl or best quality pearl?
Answer: Linga pearl refers to the best quality pearl, often obtained from pearl oysters that inhabit specific rock-forming ridges or extensive pearl banks. These particular geological formations provide ideal conditions for the oysters to produce superior pearls. Such pearls are highly valued for their luster, shape, and size. The environment plays a huge role in pearl quality.
In simple words: Linga pearl is the highest quality pearl, found in specific oyster habitats on rock ridges.

🎯 Exam Tip: Connect Linga pearl directly to "best quality" and mention its association with specific "rock-forming ridges" or "pearl banks."

 

Question 67. What are the types of cultivable fish?
Answer: Cultivable fish can be broadly categorized into different types based on their origin and adaptation:

• Indigenous or native freshwater fish: These are species naturally found in local freshwater bodies, such as Catla and Labeo.
• Saltwater fishes acclimatized for freshwater: Marine species that have been adapted to live and grow in freshwater environments.
• Exotic fishes or imported from other countries: Species like Common Carps, introduced for their desirable aquaculture traits.

This diversity allows for varied aquaculture practices across different water types.
In simple words: Cultivable fish include native freshwater fish, saltwater fish adapted to fresh water, and exotic fish from other countries.

🎯 Exam Tip: Provide at least three distinct categories for cultivable fish, offering examples for each type where relevant.

 

Question 68. What is Hapa?
Answer: Hapa refers to rectangular, trough-shaped tanks or enclosures made from mosquito net cloth. These structures are supported by bamboo poles and are typically fixed in rivers or other natural water bodies. Hapas are used in aquaculture primarily for hatching fish eggs or rearing young fish (fry and fingerlings) in a protected environment before they are transferred to larger ponds. They offer a simple, cost-effective way to manage early fish stages.
In simple words: A hapa is a rectangular net-cloth tank held by bamboo poles in a river, used to hatch fish eggs and grow young fish.

🎯 Exam Tip: Describe Hapa's physical characteristics (rectangular, mosquito net, bamboo poles) and its function (hatching/rearing young fish).

 

Question 69. What are the advantages of composite fish farming?
Answer: Composite fish farming offers several benefits:

• All available niches are fully utilized: Different fish species feeding at various levels of the pond (surface, column, bottom) ensure efficient use of food resources.
• Compatible species do not harm each other: The chosen species coexist peacefully, minimizing stress and aggression.
• No competition among different species: Since they have distinct feeding habits, there's less rivalry for food.

This method leads to higher overall fish production and efficient resource management.
In simple words: Composite fish farming makes full use of all feeding areas in a pond, avoids fights between different fish, and prevents them from competing for food.

🎯 Exam Tip: Clearly list and explain at least three distinct advantages, focusing on resource utilization and inter-species harmony.

 

Question 70. What is meant by animal husbandry?
Answer: Animal husbandry is the branch of agriculture concerned with the breeding, rearing, feeding, and caring for livestock animals such as cows, buffaloes, goats, and birds. Its purpose is to manage these animals for human benefit, producing products like milk, eggs, meat, and wool. It focuses on the well-being and productivity of farm animals.
In simple words: Animal husbandry is raising and caring for farm animals like cows and chickens to get products like milk, eggs, and meat.

🎯 Exam Tip: Define animal husbandry by its core activities (breeding, rearing, feeding, caring) and its purpose (human benefit, products like milk/meat).

 

Question 71. What is meant by breed?
Answer: In animal husbandry, a breed refers to a specific group of animals that are related by ancestry and share similar distinct characteristics, such as general appearance, features, and size. These traits are typically passed down consistently from one generation to the next, distinguishing them from other groups within the same species. Maintaining a pure breed helps preserve desired traits.
In simple words: A breed is a group of animals from the same family that look alike and have similar traits.

🎯 Exam Tip: Emphasize "related by descent" and "similar characteristics" as the defining aspects of a breed.

 

Question 72. How can we classify cattle on the basis of their utility?
Answer: Cattle can be classified into three main categories based on their primary use or utility:

1. Milch breeds: These cattle are primarily raised for milk production.
2. Draught purpose breeds: These are used for agricultural work, such as plowing fields and pulling carts.
3. Dual-purpose breeds: These cattle provide both milk and are also suitable for draught purposes.

This classification helps farmers choose the right animals for their specific needs. Each category serves an important role.
In simple words: Cattle are classified by what they are used for: milk (milch), farm work (draught), or both (dual-purpose).

🎯 Exam Tip: Listing the three categories (milch, draught, dual-purpose) with a brief explanation for each is sufficient.

 

Question 73. What are characteristic features of healthy cattle?
Answer: Healthy cattle display several recognizable characteristics:

• They appear bright: Indicating alertness and good health.
• Alert: Showing responsiveness to their surroundings.
• Active: Moving freely and engaging in normal behaviors.
• Shiny coat: A lustrous coat often reflects good nutrition and overall well-being.

Additionally, healthy cattle eat, drink, and sleep regularly, maintaining a consistent routine.
In simple words: Healthy cattle look bright, are active, and have a shiny coat, showing they are well.

🎯 Exam Tip: Focus on observable external signs like brightness, activity, and coat appearance as indicators of health.

 

Question 74. What are the characteristic features of unhealthy cattle?
Answer: Unhealthy cattle often exhibit noticeable signs that indicate poor health:

• They appear dull: Lacking vigor and alertness.
• Restless: Showing discomfort or anxiety.
• Change posture frequently with a drop in milk yield: This can indicate pain or illness, along with reduced productivity.

These symptoms are important for farmers to notice early to prevent further illness. Any deviation from normal behavior should be investigated.
In simple words: Unhealthy cattle look dull, are restless, and often change how they stand while giving less milk.

🎯 Exam Tip: Contrast these features with healthy cattle characteristics and emphasize the "drop in milk yield" as a practical indicator for farmers.

 

Question 75. Name the important cattle disease?
Answer: Several important diseases can affect cattle, causing significant economic losses and impacting animal welfare. Some common and serious cattle diseases include:

• Rinder pest: A highly contagious viral disease.
• Cowpox: A viral disease that can cause skin lesions.
• Anthrax: A severe bacterial disease that can be fatal.
• Hemorrhagic fever: Often used to describe various diseases causing bleeding symptoms.

Vaccination and hygiene are crucial for preventing these diseases.
In simple words: Important cattle diseases are Rinder pest, Cowpox, Anthrax, and hemorrhagic fever.

🎯 Exam Tip: Listing at least three distinct diseases is usually sufficient for this type of question.

 

Question 76. What is meant by poultry?
Answer: Poultry refers to domesticated birds raised by humans for their meat, eggs, or feathers. This includes a variety of birds such as chickens, ducks, turkeys, geese, quails, and guinea fowls. Poultry farming is an important sector of agriculture that provides essential food sources globally. It is an efficient way to convert feed into protein.
In simple words: Poultry means farm birds like chickens, ducks, and turkeys raised for their meat, eggs, or feathers.

🎯 Exam Tip: Define poultry by including various examples of birds and mentioning their primary uses (meat, eggs, feathers).

 

Question 77. What are the types of chicken breeds based on their utility?
Answer: Chicken breeds are categorized based on their primary use or utility in farming:

• Egg layers: Breeds specifically raised for high egg production.
• Broiler type: Breeds developed for rapid growth and meat production.
• Dual type: Breeds that serve both purposes, providing a reasonable amount of eggs and meat.
• Games and ornamental types: Breeds kept for fighting, show, or aesthetic appeal rather than primary food production.

Farmers select breeds based on their specific needs and market demands.
In simple words: Chicken breeds are categorized by their use: for eggs, meat, both, or for looks and fighting.

🎯 Exam Tip: List the different utility types of chicken breeds and provide a brief explanation for each category.

 

Question 78. Name the native ducks.
Answer: Native ducks are breeds that originate from a specific region or country and have adapted to its local conditions over time. In India, some native duck breeds include:

• Indian Runner
• Syhletmeta

These indigenous breeds are often hardy and well-suited to the local climate and farming practices. They play an important role in local biodiversity.
In simple words: Indian Runner and Syhletmeta are examples of native duck breeds.

🎯 Exam Tip: Provide specific names of native duck breeds, showing knowledge of local varieties.

 

Question 79. Name the exotic ducks.
Answer: Exotic ducks are breeds that have been introduced from other regions or countries, often for commercial farming due to their desirable traits like fast growth or high egg production. Some examples of exotic duck breeds include:

• Muscovy
• Pekin
• Aylesbury
• Campbell

These breeds contribute to the diversity of poultry farming and food production in many regions. Each has its own distinct characteristics.
In simple words: Muscovy, Pekin, Aylesbury, and Campbell are kinds of exotic ducks.

🎯 Exam Tip: List at least three specific exotic duck breeds to demonstrate comprehensive knowledge.

 

Question 80. What are the three stages of sericulture?
Answer: Sericulture, the cultivation of silkworms for silk production, typically involves three main stages:

1. Cultivation of food plants for the silkworm: This primarily involves growing mulberry plants, as their leaves are the main food source for silkworms.
2. Rearing of silkworms: This stage involves carefully raising the silkworms from eggs through their larval stages until they spin cocoons.
3. Reeling and spinning of silk: Once the cocoons are formed, the silk filaments are extracted (reeled) and then processed into silk thread (spun).

Each stage is critical for successful silk production.
In simple words: The three stages of sericulture are growing plants for silkworms, raising the silkworms, and then getting silk from their cocoons.

🎯 Exam Tip: Clearly list and briefly explain each of the three key stages of sericulture to show a complete understanding of the process.

 

Question 81. What is meant by apiculture?
Answer: Apiculture, also known as beekeeping, is the practice of caring for and managing honey bee colonies on a commercial scale. The primary goal of apiculture is the production of honey and other bee products, such as beeswax, pollen, and royal jelly. It also plays a vital role in pollinating crops. This practice requires knowledge of bee biology and behavior.
In simple words: Apiculture is keeping honey bees to produce honey and other bee products.

🎯 Exam Tip: Remember to mention both the "care and management" of bees and the "commercial scale" for producing honey and other products.

 

Question 82. What is the importance of aquaponics?
Answer: Aquaponics is important because it creates a balanced ecosystem that recycles waste and conserves resources. It combines aquaculture (raising fish) with hydroponics (growing plants without soil). The waste products from the fish provide nutrients for the plants, which in turn filter the water for the fish. This integrated system uses less water and land than traditional farming. It offers a sustainable way to produce both fish and vegetables.
In simple words: Aquaponics is important because it reuses waste, saves water, and helps grow both fish and plants together in a balanced way.

🎯 Exam Tip: Focus on aquaponics as an "ecosystem balance" and "waste recycling" system that produces food efficiently.

 

Question 83. What is meant by aquaponics?
Answer: Aquaponics is an innovative farming technique that integrates aquaculture (raising aquatic animals like fish) with hydroponics (cultivating plants in water without soil). It forms a symbiotic environment where the nutrient-rich waste water from the fish tanks provides fertilizer for the growing plants, and the plants, in turn, filter and purify the water for the fish. This sustainable method minimizes water usage and allows for food production in limited spaces.
In simple words: Aquaponics is a farming system that grows fish and plants together, where fish waste feeds the plants and plants clean the water for fish.

🎯 Exam Tip: The core definition of aquaponics lies in its combination of aquaculture and hydroponics, creating a recirculating, nutrient-rich system.

 

Question 84. Based on the water resources where are aquatic organisms cultured? Give examples.
Answer: Aquatic organisms are cultured in various environments depending on the water resources available:

1. Freshwater culture: Organisms are raised in ponds, lakes, and rivers (e.g., carps, Tilapia).
2. Brackish water culture: Utilizes estuaries, mangroves, and coastal lagoons (e.g., mullets, milkfish).
3. Marine culture: Farming in the open ocean or marine tanks (e.g., shrimp, oysters, sea bass).

Each type of culture allows for specific species to thrive in their ideal conditions.
In simple words: Aquatic organisms are raised in fresh water, brackish water (mixed), and marine water (salt water), with different types of fish for each.

🎯 Exam Tip: Categorize by water resource (freshwater, brackish water, marine culture) and provide at least two relevant examples for each to show depth of knowledge.

 

III. Short Answers

 

Question 1. What is meant by vermiculture?
Answer: Vermiculture is the process of using earthworms to decompose organic food waste and other organic materials into a nutrient-rich substance called vermicompost. This material is excellent for soil as it provides necessary nutrients, helping to support healthy plant growth. It's a natural and eco-friendly way to manage waste and enrich soil.
In simple words: Vermiculture uses earthworms to turn organic waste into rich soil food for plants.

🎯 Exam Tip: Define vermiculture by mentioning earthworms, organic waste decomposition, and the production of nutrient-rich material for plant growth.

 

Question 2. What is meant by worm casting?
Answer: Worm castings are the rich, nutrient-filled waste products (feces) produced by earthworms after they consume organic matter. These castings are essentially pure worm waste combined with bits of bedding and other organic material, forming a highly fertile soil amendment. They are excellent for plant growth, improving soil structure and nutrient availability. Think of them as natural fertilizer pellets.
In simple words: Worm castings are the nutrient-rich waste left by earthworms after they eat organic matter, acting like natural fertilizer.

🎯 Exam Tip: Emphasize that worm castings are "pure worm waste" and "nutrient-rich organic soil" that promotes plant growth.

 

Question 3. Why earthworms are called as ‘Farmers of friends’
Answer: Earthworms are known as 'farmers' friends' because they greatly improve soil health and fertility. They help by:

• Supporting beneficial bacteria and fungi, which are essential for maintaining healthy soil ecosystems.
• Breaking down organic matter, turning it into valuable humus.
• Increasing soil porosity, aeration, and drainage, which improves root growth and water absorption.

Their actions naturally enrich the soil, making it more productive for farming.
In simple words: Earthworms are called 'farmers' friends' because they help the soil stay healthy by breaking down organic matter and making it airy.

🎯 Exam Tip: Focus on earthworms' contributions to soil health: supporting microbes, breaking down organic matter, and improving soil structure.

 

Question 4. What are the three main components of sericulture?
Answer: The three main components of sericulture, the process of producing silk, are:

1. Cultivation of food plants for the silkworms: Primarily growing mulberry plants, which are the main diet of silkworms.
2. Rearing of silkworms: Raising silkworms from the egg stage through their larval development until they spin cocoons.
3. Reeling and spinning of silk: Extracting the silk filament from the cocoons (reeling) and then twisting these filaments into usable silk threads (spinning).

These steps work together to create the final silk product. Each step is critical for successful silk production.
In simple words: Sericulture involves growing food for silkworms, raising the silkworms, and then making silk thread from their cocoons.

🎯 Exam Tip: Clearly list and briefly explain each of the three key stages, starting from plant cultivation to silk processing.

 

Question 5. Name the predators of earthworms?
Answer: Earthworms are a food source for many animals, making them prey for a variety of predators. Some common predators of earthworms include:

• Ants
• Centipedes
• Slugs
• Birds
• Rats
• Snakes

These predators can significantly impact earthworm populations, especially in composting systems. They play a role in the natural food chain.
In simple words: Ants, centipedes, slugs, birds, rats, and snakes all eat earthworms.

🎯 Exam Tip: List several diverse examples of predators, including insects, birds, and small mammals/reptiles.

 

Question 6. Name the honey bees used in apiculture.
Answer: Several species and subspecies of honey bees are commonly used in apiculture (beekeeping) due to their honey production and manageable nature. Important types include:

• *Apis dorsata* (Giant honey bee)
• *Apis florea* (Dwarf honey bee)
• *Apis indica* (Indian honey bee)
• *Apis mellifera* (European honey bee)
• *Apis adamsoni* (African honey bee)

Each species has unique characteristics, such as aggressiveness, honey yield, and adaptation to different climates. Beekeepers choose based on local conditions and goals.
In simple words: *Apis dorsata*, *Apis florea*, *Apis indica*, *Apis mellifera*, and *Apis adamsoni* are common honey bees used in beekeeping.

🎯 Exam Tip: Providing scientific names for the honey bee species adds precision and scientific accuracy to your answer.

 

Question 7. What is Propolis?
Answer: Propolis is a resinous substance collected by bees from tree buds, sap flows, and other botanical sources. Bees mix it with their own secretions, like wax, and use it to seal gaps in the hive, strengthen comb, and protect against bacteria and fungi. It's often called "bee glue" and has natural antibiotic properties, which protect the hive from infections. Humans also use it for its potential health benefits.
In simple words: Propolis is a sticky, resin-like material collected by bees and mixed with wax, used to seal and protect their hive.

🎯 Exam Tip: Explain that propolis is a "resinous chemical substance" and mention its role in hive protection, not merely its presence in wax.

 

Question 8. What are the uses of silk?
Answer: Silk, a natural fiber, has a wide range of uses:

1. Silk fibers are primarily used for preparing silk clothes. They can be combined with other natural or synthetic fibers, like Teri-Silk or Cot-Silk, to create various fabrics. Silk is also dyed and printed to make ornamental fabrics, often from Eri-silk or spun silk.
2. Silk is valuable in various industries and for military purposes, where its strength and lightness are beneficial.
3. It is used in manufacturing specialized items such as fishing fibers, parachutes, cartridge bags, insulation coils for telephones, wireless receivers, tires for racing cars, filter fibers, medical dressings, and suture materials. The durability and fine texture of silk make it highly versatile.

In simple words: Silk is used for clothing, various industrial products like parachutes and fishing fibers, and medical materials due to its strength and fine texture.

🎯 Exam Tip: Structure your answer by categorizing silk's uses (clothing, industrial/military, specialized manufacturing) to ensure comprehensive coverage.

 

Question 9. Describe the structure of Beehive?
Answer: A beehive is the structured home of honey bees, often referred to as a comb. Its key features include:

• The hive is made of hexagonal cells, constructed from wax secreted by worker bees. These six-sided cells are very efficient for storage and housing.
• These hives are typically found hanging vertically from rocks, buildings, or tree branches, offering natural protection.
• The lower and central cells of the hive are designed to accommodate the young stages of honey bees, known as brood cells.
• Within the rock bees' hives, there are distinct cells for queens, workers, and drones, each with a specific purpose.

This organized structure helps the colony thrive and manage its resources effectively.
In simple words: A beehive is a comb made of hexagonal wax cells where honey bees live, hanging from natural spots, with special cells for young bees, queens, workers, and drones.

🎯 Exam Tip: Focus on the hexagonal cells, wax construction by worker bees, and the vertical hanging nature of natural hives when describing their structure.

 

Question 10. Explain the structure of a beehive?
Answer: A beehive, or comb, is the home built by honey bees. It has hexagonal cells made of wax, which worker bees secrete from their abdomen. These cells are arranged in rows on a common base. Hives are typically found hanging downwards from rocks, buildings, or tree branches. The lower and central parts of the hive are where the young bees (brood cells) grow. The hexagonal shape of the cells is very strong and efficient for storing honey and pollen, as well as for raising young bees.
In simple words: A beehive is a comb made of hexagonal wax cells by worker bees, hanging vertically, where young bees grow in the lower cells.

🎯 Exam Tip: When explaining the structure, include details about the hexagonal cells, their wax composition, and their typical natural placement (hanging vertically).

 

Question 11. What is meant by inbreeding? What are its effects?
Answer: Inbreeding means breeding animals of the same type for 4 to 6 generations. It brings similar genes together, which can be good for desired traits but also exposes unwanted hidden genes. This can lead to a reduction in fertility and overall health, known as inbreeding depression. To avoid these negative effects, farmers can carefully breed selected animals that are not closely related to the main group.
In simple words: Inbreeding is mating closely related animals. While it can strengthen good traits, it can also bring out bad ones, making the animals less fertile or healthy.

🎯 Exam Tip: When defining breeding terms, always include the key characteristics, like "same breed" and "number of generations" for inbreeding, and follow up with both positive and negative effects.

 

Question 12. How animals are classified based on their economic importance.
Answer: Animals are grouped based on how useful they are to humans in different ways. They are classified as:

• Animals that provide food and food products.
• Animals that are helpful for economic activities.
• Animals that are important for beauty or culture.
• Animals used for scientific studies.

Understanding these categories helps manage animal resources better.
In simple words: Animals are sorted by how they help people, like providing food, aiding the economy, being pets, or for science.

🎯 Exam Tip: Remember to list at least three distinct categories when asked to classify animals by economic importance, ensuring each category has a clear difference.

 

Question 13. Give an account of earthworm based on their habitat.
Answer: Earthworms live in different places based on their habits, and they are usually put into two main groups:

First group (Humus formers): These earthworms live on the surface of the soil and eat organic matter, like decaying leaves. They often have a darker color and are commonly used in vermicomposting because they help break down waste quickly.

Second group (Humus feeders): These earthworms dig tunnels deep in the soil. They help make the soil more airy and mix the humus (rich organic material) throughout the ground. This mixing is important for distributing nutrients to plant roots.
In simple words: Earthworms are grouped by where they live and what they eat. Some live on top and eat dead plants, while others dig deep tunnels to mix the soil.

🎯 Exam Tip: When describing earthworm groups, clearly mention their habitat (surface or burrowing) and their primary role (eating organic matter or mixing soil).

 

Question 14. What are the uses of honey wax?
Answer: Honey wax is a versatile natural product with many uses. It is primarily used to make candles, providing a natural and long-lasting light source. It is also used in making materials waterproof, protecting items from moisture. Furthermore, honey wax is a component in polishes for home appliances and leather, giving them a shine and protective layer. Lastly, it plays a role in the pharmaceutical industry.
In simple words: Honey wax is used for making candles, waterproofing things, polishing items like leather, and in making medicines.

🎯 Exam Tip: When listing uses of a product like honey wax, try to include a variety of applications from different sectors (e.g., home, industrial, personal care) to show a broad understanding.

 

Question 15. What is meant by Hyper parasitism?
Answer: Hyper parasitism is a special kind of parasitism where a parasite itself is infected by another parasite. This means a secondary parasite grows inside a parasite that is already living inside another host. For example, caterpillars might feed on lac insects, which are already parasites on plants, showing this complex relationship.
In simple words: Hyper parasitism is when one parasite lives inside another parasite.

🎯 Exam Tip: Define parasitism first to set the context, then clearly explain that hyper parasitism involves a "parasite of a parasite" to make your answer precise.

 

Question 16. What are the economic importance of Lac?
Answer: Lac holds significant economic importance due to its diverse applications. It is widely used as a sealing wax for various purposes, including official documents. Lac also serves as an excellent insulator, preventing the flow of electricity or heat. Moreover, it is a key ingredient in making shoe and leather polishes, providing shine and protection. It also acts as a protective coating for wood, safeguarding it from damage. Additionally, lac is used in making plastic molded items and as a decorative filling material for gold ornaments. Its natural resinous properties make it valuable in many industries.
In simple words: Lac is important because it is used for sealing, as an insulator, in polishes for shoes and wood, in plastic items, and to decorate gold.

🎯 Exam Tip: When listing economic importance, categorize the uses (e.g., protective, decorative, industrial) to provide a structured and comprehensive answer.

 

Question 17. Name the breeds of cattle?
Answer: Cattle breeds are generally categorized based on their primary use. The main types of cattle breeds are:

• Milch breeds: These are cattle known for producing a lot of milk, like the Sindhi Jersey.
• Draught breeds: These cattle are strong and used for farm work, such as the KangeyamMalvi.
• Dual-purpose breeds: These cattle are good for both milk production and farm work, an example is the Ongole Hariana.

These classifications help farmers choose the best animals for their specific needs.
In simple words: Cattle breeds are grouped into three types: those that give a lot of milk (Milch), those used for farm work (Draught), and those good for both (Dual-purpose).

🎯 Exam Tip: When listing cattle breeds, always provide at least one example for each category to illustrate your understanding clearly.

 

Question 18. What is meant by Milch breed?
Answer: A Milch breed refers to a type of cattle that is primarily raised for its high milk production. These animals are selected for their ability to yield a large amount of milk over an extended period, which is very important for dairy farming. Examples include the Sindhi and Brown Swiss cows, which are valued for their milky output.
In simple words: Milch breeds are cows that give a lot of milk and produce milk for a long time.

🎯 Exam Tip: The key elements for defining a milch breed are "high milk yield" and "extended lactation period."

 

Question 19. What is Dual purpose?
Answer: Dual-purpose cattle breeds are animals that are useful for two main things: milk production and farm work. The cows of these breeds provide milk, while the bullocks (male cattle) are strong and can be used for pulling plows or carts. The Ongole Hariana is an example of such a breed, offering both milk and power for agricultural tasks.
In simple words: Dual-purpose cattle are good for both giving milk and for doing farm work like pulling carts.

🎯 Exam Tip: Emphasize that "dual purpose" refers to both milk production (from cows) and draft work (from bullocks) to fully explain the concept.

 

Question 20. What is draught purpose breeds?
Answer: Draught purpose breeds are types of cattle specifically raised for their strength and ability to perform heavy farm tasks. These animals, mainly bullocks, are used for pulling plows, carts, and other agricultural equipment. They are strong and hardy, making them essential for farming activities that require animal power. The Malvi breed, for instance, is well-known for its excellent draught qualities.
In simple words: Draught breeds are strong bullocks used for farm work, like pulling plows and carts.

🎯 Exam Tip: When explaining draught breeds, highlight their role in "heavy farm tasks" and mention that bullocks are typically used for this purpose.

 

Question 21. What are the characteristic features of healthy cattle?
Answer: Healthy cattle show several clear signs of good well-being. A healthy animal eats, drinks, and sleeps well regularly, showing normal behavior. Their coat appears bright and shiny, indicating good nutrition and health. They are also alert and active in their movements, showing no signs of weakness or discomfort. These combined features suggest that the cattle are in excellent condition.
In simple words: Healthy cows eat, drink, and sleep well. They look bright, have shiny coats, and move actively.

🎯 Exam Tip: Focus on easily observable physical characteristics and behavioral patterns when describing healthy animals.

 

Question 22. What are the external factors affecting fish culture?
Answer: Many outside factors can impact the success of fish farming. These include the water's temperature and the amount of light it receives. Rainfall and floods can also change the water conditions. The strength of the water current, how clear or turbid the water is, and its pH level (how acidic or alkaline it is) all play a big role in how well fish grow. Managing these factors is key to successful fish culture.
In simple words: Fish farming is affected by things like water temperature, light, rain, floods, water flow, water clarity, and pH level.

🎯 Exam Tip: When listing external factors, think broadly about environmental conditions (e.g., physical, chemical) that directly interact with the aquatic ecosystem.

 

Question 23. What is Aquaponics?
Answer: Aquaponics is a special farming method that combines raising fish (aquaculture) with growing plants without soil (hydroponics). In this system, fish waste provides nutrients for the plants, and the plants help clean the water for the fish. It creates a balanced ecosystem where both fish and plants thrive together. This method is gaining popularity for sustainable food production.
In simple words: Aquaponics is a system that grows fish and plants together. Fish waste feeds the plants, and plants clean the water for the fish.

🎯 Exam Tip: Clearly state that aquaponics is a combination of "aquaculture" and "hydroponics" and briefly explain the symbiotic relationship between fish and plants.

 

Question 24. Name the species of prawn.
Answer: There are several important species of prawns commonly found and cultured. These include Penaeus indicus, Penaeus monodon, Metapenaeus dobsoni, and Macrobrachium rosenbergii. Each species has unique characteristics and is often chosen for specific farming conditions. These prawns are important for fisheries and aquaculture around the world.
In simple words: Some types of prawns are Penaeus indicus, Penaeus monodon, Metapenaeus dobsoni, and Macrobrachium rosenbergii.

🎯 Exam Tip: When asked to name species, list distinct scientific or common names clearly. It is good practice to recall at least three if possible.

 

Question 25. What are the three types of aquaculture on the basis of the source?
Answer: Aquaculture, which is the farming of aquatic organisms, is classified into three main types based on the water source used:

• Freshwater aquaculture: This type of farming takes place in inland waters such as ponds, lakes, and rivers.
• Brackish water aquaculture: This involves cultivating organisms in waters where fresh and saltwater mix, like estuaries and lagoons.
• Marine water aquaculture: This refers to farming in the open sea or coastal areas, using oceans as the primary water source.

Each type requires different management strategies due to varying water conditions.
In simple words: Aquaculture is divided into three types based on water: freshwater (rivers/lakes), brackish water (where fresh and salt water mix), and marine water (the sea).

🎯 Exam Tip: Clearly differentiate between the water sources for each type, as this is the fundamental distinction for classification.

 

Question 26. What are the benefits of poultry farming?
Answer: Poultry farming offers many advantages, making it a popular agricultural activity. It does not require a lot of money to start or maintain compared to other types of farming. Also, it does not need a large area of land, which makes it suitable for many settings. Poultry farming gives a good return on investment and provides fresh, healthy food for a huge number of people. It also creates many job opportunities for individuals in rural and urban areas.
In simple words: Poultry farming needs little money and space, gives good profits, provides food, and creates jobs.

🎯 Exam Tip: When discussing benefits, think about economic aspects (capital, return), logistical aspects (space), and societal contributions (food, employment).

 

Question 27. What are the uses of dairy products?
Answer: Dairy products are highly versatile and provide essential nutrients and various food items. Milk itself is a rich source of vitamins A, B2, and B1, and is considered a complete food, especially for infants. Beyond fresh milk, a wide range of products are made, including yogurt, cheese, butter, ice cream, condensed milk, and milk powder. These products are used in countless meals and contribute significantly to human nutrition worldwide.
In simple words: Dairy products like milk, yogurt, and cheese give us vitamins and are used in many foods. Milk is a full meal for babies.

🎯 Exam Tip: When listing uses, mention both the nutritional value (vitamins, complete food) and the variety of derived products to show a comprehensive understanding.

 

Question 28. What is the importance of meat?
Answer: Meat is a vital part of many diets around the world due to its nutritional value. It is an excellent source of protein, which is essential for building and repairing body tissues. Additionally, meat contains important minerals such as iron and zinc, and various vitamins, including selenium, all of which are crucial for overall health and body functions. This makes it a key food for proper growth and health.
In simple words: Meat is important because it gives us a lot of protein, which helps our bodies grow, and also provides important minerals and vitamins.

🎯 Exam Tip: Focus on the primary nutritional contributions (protein, specific minerals/vitamins) when discussing the importance of meat.

 

Question 29. What is Mariculture?
Answer: Mariculture is a type of aquaculture that involves farming aquatic animals and plants in saltwater, specifically in marine environments. This is done in waters with a salinity range of 30-35%. Examples of fishes cultured through mariculture include Chanos sp and Mugil cephalus. Mariculture helps meet the demand for seafood and reduce pressure on wild fish populations. This method is crucial for sustainable seafood production.
In simple words: Mariculture is farming sea animals and plants in salty ocean water, like growing fish such as Chanos sp.

🎯 Exam Tip: The key difference for mariculture is "saltwater" or "marine environment," distinct from freshwater or brackish water aquaculture.

 

Question 30. What are poultry diseases?
Answer: Poultry, like chickens, can suffer from various diseases that affect their health and productivity. Some common poultry diseases include Ranikhet, which is a severe viral infection that can be fatal. Coccidiosis is another common parasitic disease that affects the intestines. Fowl pox is a viral skin disease that causes lesions. Keeping poultry healthy requires good hygiene and timely vaccinations. These diseases can cause significant losses in poultry farms.
In simple words: Common chicken diseases are Ranikhet, Coccidiosis, and Fowl Pox.

🎯 Exam Tip: When listing diseases, aim to name at least two or three common ones, and if possible, briefly mention their nature (e.g., viral, parasitic).

5 Marks

IV. Give Detailed Answers

 

Question 1. How are vermicompost produced?
Answer: Vermicompost is produced by earthworms working together with other organisms in a compost unit. First, a suitable vermicompost bed is chosen, usually on a slightly raised piece of land. A cement pit, typically 3x2x1 meters, is built on the ground using bricks. This bed should not be in direct sunlight to protect the worms.

The first layer of the vermibed consists of gravel, about 3.5 cm thick, which helps water drain away easily. After this, the unit is filled with digested biomass or animal dung. Earthworms like Periyonyx excavatus, Eisenia fetida, or Eudrilus eugeniae are then added on top. These worms break down the organic material and release their castings, which are rich in nutrients, on the surface. These castings become the vermicompost. Additionally, a liquid called vermiwash, collected after water passes through the vermibed, is a useful liquid fertilizer to help plants grow.
In simple words: Vermicompost is made by earthworms in a special bed. They eat waste like dung, and their droppings become rich compost. A special liquid called vermiwash also comes from this process and helps plants grow.

🎯 Exam Tip: When describing the production of vermicompost, include both the physical setup (pit, layers) and the biological agents (specific earthworm species) involved in the process.

 

Question 2. Describe the life cycle of bombyx mon?
Answer: The Bombyx mori moth has a distinct life cycle. These moths have separate male and female individuals. Soon after they emerge, the male and female moths mate for about 2-3 hours. After mating, the female moth lays around 400-500 eggs. These eggs hatch into tiny larvae, called caterpillars, after about ten days of incubation. The newly hatched caterpillars are very small, around 3mm long, and are a pale yellowish-white color.

These caterpillars have special mouthparts that help them feed easily on mulberry leaves, which is their main food. As they grow, the caterpillars go through several moulting stages (1st, 2nd, 3rd, 4th, and 5th instars). After the 4th moult, they transform into the 5th instar. During this final stage, they develop salivary glands, stop eating, and prepare to turn into pupae. The caterpillars then secrete a sticky fluid from their silk glands, which hardens into a silk thread. This thread is used to spin a cocoon around their body. The silk thread from one cocoon can be very long, about 1000-1200 meters. The pupal stage lasts for 10-12 days, after which the adult moth cuts through the cocoon and emerges. The larvae usually moult 3, 4, or 5 times to become mature.
In simple words: The Bombyx mori moth lays eggs that hatch into caterpillars. These caterpillars eat mulberry leaves, grow, and then spin a silk cocoon around themselves. Inside the cocoon, they change into a pupa, and later, an adult moth comes out.

🎯 Exam Tip: Detail each major stage (egg, larva/caterpillar, pupa, adult moth), mentioning key activities like feeding, moulting, and cocoon spinning, along with relevant timings.

 

Question 3. What are the uses of vermicompost?
Answer: Vermicompost offers numerous benefits for agriculture and gardening. It provides excellent organic manure, promoting sustainable farming practices. This compost is rich in essential plant nutrients, which helps plants grow strong and healthy. It also significantly improves soil structure, texture, and aeration, allowing roots to breathe better. By enhancing the water-holding capacity of the soil, it helps prevent soil erosion. For home and terrace gardening, vermicompost serves as an eco-friendly amendment that boosts soil fertility. Ultimately, it enhances seed germination and ensures good plant growth, leading to higher yields. Selling vermicompost can also be a source of extra income.
In simple words: Vermicompost helps plants grow, makes soil better, holds water, stops soil from washing away, and helps seeds sprout. It's also good for the environment and can earn money.

🎯 Exam Tip: When listing the uses of vermicompost, focus on its impact on soil health (structure, aeration, water retention) and plant growth (nutrients, germination).

 

Question 4. What are the reasons for culturing carps in India?
Answer: Carps are highly favored for fish farming in India for several practical reasons. They primarily feed on zooplankton, phytoplankton, decaying weeds, debris, and other aquatic plants, which makes them easy to feed and helps clean the pond environment. Carps are hardy and can survive well in turbid (muddy) water, as well as in slightly higher temperatures, making them adaptable to various conditions. They can also tolerate different levels of oxygen in the water. Moreover, carps can be easily transported from one place to another without much stress, which is important for distribution. Finally, they are highly nutritious and palatable, making them a popular food source. These qualities make carps an ideal choice for aquaculture in India.
In simple words: Carps are good for farming in India because they eat many things, live well in different water conditions, can be moved easily, and are tasty and healthy to eat.

🎯 Exam Tip: When explaining why a species is suited for culture, highlight its feeding habits, environmental tolerance, and commercial value.

 

Question 5. What are the uses of silk?
Answer: Silk is a highly valued natural fiber with a wide range of uses. Primarily, silk fibers are used to prepare elegant silk clothes, prized for their luxurious feel and appearance. They are often combined with other natural or synthetic fibers to create blended fabrics like Teri-Silk and Cot-Silk, enhancing their properties. Silk is also dyed and printed to create beautiful, ornamental fabrics. Eri-silk or spun silk are commonly used for this. Beyond fashion, silk is important in industries and for military purposes. It is used in manufacturing fishing fibers, parachutes, and cartridge bags because of its strength. Silk is also used in insulation coils for telephones and wireless receivers, as well as in tires for racing cars. In medical applications, silk fibers are found in dressings and suture materials due to their biocompatibility.
In simple words: Silk is used to make fancy clothes, mixed fabrics, and decorated materials. It is also important in industries for making fishing lines, parachutes, and in medical supplies.

🎯 Exam Tip: When listing the uses of silk, ensure to cover its primary application in textiles and also include its less common but significant industrial and medical uses to show a complete picture.

 

Question 6. Name the pests and diseases of the silkworm.
Answer: Silkworms, essential for silk production, face threats from various pests and diseases.

1. Predators: These animals feed on silkworms, causing significant losses. Common predators include:

• Birds
• Ants
• Crows
• Kites
• Rats

2. Diseases: Silkworms are also susceptible to several diseases:

• Pebrin: This disease is caused by a protozoan called Nosema bombycis.
• Flacherie: This bacterial disease affects mature larvae and is caused by bacteria like streptococcus and staphylococcus.
• Grasserie: A viral disease caused by the Bombyx mori nuclear polyhedrosis virus.
• White Muscardine: This fungal disease is caused by Beauveria bassiana.

Controlling these pests and diseases is crucial for successful sericulture.
In simple words: Silkworms are attacked by pests like birds, ants, and rats. They also get diseases like Pebrin (from a protozoan), Flacherie (from bacteria), Grasserie (from a virus), and White Muscardine (from a fungus).

🎯 Exam Tip: Categorize your answer into "Predators" and "Diseases" and provide specific examples for each, including the type of pathogen for diseases where applicable.

 

Question 7. Describe the social organziation of honey bee.
Answer: Honey bees live in highly organized colonies with a clear division of labor, meaning each bee has specific jobs. There are three main types, or castes, of honey bees in a colony:

• Queen bee: There is only one queen bee in a colony. She primarily feeds on royal jelly. Her main job is to lay eggs throughout her life, which is her only function. During the breeding season in winter, she takes a unique "nuptial flight" followed by several drones. After mating, she can lay about 1.5 million eggs over two to four years.
• Worker bee: These are sterile female bees, meaning they cannot reproduce. Worker bees live for about six weeks. They perform various duties throughout their lifetime. In the first half of their life, they act as nurse bees, producing royal jelly, making bee bread to feed larvae, feeding the queen, and caring for the queen and drones. They also secrete beeswax, build combs, clean, and fan the beehive. In the second half of their life (about three weeks), they become soldiers, guarding the hive, and foraging for pollen, nectar, propolis, and water.
• Drones: These are male bees that develop from unfertilized eggs. Drones live in a special drone cell within the comb. Their sole purpose is to fertilize the queen, and they are sometimes called the "king of the colony" because of this vital role.

This complex social structure ensures the survival and productivity of the entire colony.
In simple words: Honey bees live in groups with different jobs. The queen lays all the eggs. Worker bees do everything else, like collecting food, building the hive, and caring for young. Drones are male bees whose only job is to mate with the queen.

🎯 Exam Tip: Clearly describe each caste (queen, worker, drone) and their specific roles and life spans to demonstrate a full understanding of honey bee social organization.

 

Question 8. Describe the structure of the Langstroth beehive?
Answer: The Langstroth beehive is a carefully designed structure that helps beekeepers manage honey bee colonies efficiently. It consists of several key parts:

• Stand: This is the base of the hive, designed to create a slope so rainwater drains away and doesn't collect around the hive.
• Bottom board: Placed above the stand, it has two openings: one for bees to enter and another for them to exit.
• Brood chamber: This is a crucial part of the hive where the queen bee lays eggs and the young bees (brood) are raised. It typically contains 5 to 10 frames arranged one above the other, allowing worker bees to move easily between them.
• Frame: Each frame holds a sheet of wax foundation, supported vertically by wires. Bees build their honeycomb on this foundation.
• Super: This is a chamber without a cover or base, placed above the brood chamber. It is filled with many frames and provides extra space for the bees to store honey, allowing the colony to expand.
• Inner cover: A wooden piece used to cover the super, helping to regulate temperature and provide space for proper ventilation within the hive.
• Top cover: This is the outermost cover, designed to protect the colony from rain and other weather conditions. It is typically a plain, sloping sheet.

This modular design makes inspection and honey harvesting easier.
In simple words: A Langstroth beehive has many parts: a stand, a bottom board for bees to enter, a brood chamber for babies, frames for honeycomb, a super for honey storage, and covers on top to protect the hive from weather.

🎯 Exam Tip: When describing the beehive structure, list each component and briefly explain its function to show how it contributes to the overall management of the colony.

 

Question 9. Give an account of equipments of beehives and its uses.
Answer: Managing beehives requires various specialized equipment, each serving a unique purpose to ensure the health of the colony and ease of honey collection:

• Queen Excluder: This device is used to prevent the queen bee from entering the super chamber (where honey is stored) and laying eggs there, ensuring pure honey.
• Comb Foundation: It is a sheet made of beeswax that provides a guide for bees to build their honeycombs uniformly.
• Bee Gloves: These protective gloves are worn by beekeepers to shield their hands from stings during hive inspections.
• Bee Veil: A special hood with a mesh screen that protects the beekeeper's face and neck from bee stings.
• Smoker: This tool produces cool smoke, which calms the bees, making them less aggressive during hive inspections and honey collection.
• Hive Tool: A multi-purpose tool used by beekeepers to pry apart hive components that are glued together by propolis (bee glue) or wax, and to scrape off excess propolis or wax.
• Uncapping Knife: Used to remove the wax caps from honeycombs before extracting the honey.
• Bee Brush: A soft brush used to gently remove bees from honeycombs without harming them during harvesting.
• Queen Introducing Cage: A small wire mesh cage used to temporarily hold a new queen bee, allowing the colony to get used to her scent before she is fully released.
• Feeder: A basin filled with sugar syrup, often covered with grass, used to provide supplemental food to bees, especially during times of nectar scarcity or drought.
• Honey Extractor: A centrifugal machine that spins honeycombs rapidly to extract honey without damaging the cells.
• Hive Entrance Guard: A device placed at the hive entrance to prevent the queen bee from escaping, especially during swarming season.

These tools are crucial for efficient and safe beekeeping practices.
In simple words: Beekeepers use tools like a queen excluder to keep the queen out of honey areas, gloves and veils for protection, a smoker to calm bees, and a hive tool to open the hive. They also use knives to uncap honey, brushes to move bees, cages to introduce new queens, feeders for sugar syrup, and extractors for honey.

🎯 Exam Tip: When detailing beehive equipment, ensure you name each item and clearly state its specific function or benefit in beekeeping.

 

Question 10. Describe the process of rearing silkworms?
Answer: Rearing silkworms involves several key steps:
1. A special rearing house, usually 6m x 4m x 3.5m, is built in an elevated, shaded area to hold 100 trays (dfls).
2. The windows and vents are covered with nylon nets to keep out pests like uziflies and other insects.
3. Healthy silk moths are chosen to mate for 4 hours.
4. The female moth lays about 400 eggs on a dark plastic bed within 24 hours.
5. The small larvae hatch after 7-10 days.
6. These larvae are kept in trays at a temperature of 20°C-25°C.
7. As the larvae grow, they are moved to fresh leaves on clean trays.
8. They reach maturity in about 45 days. During this time, they shed their skin several times.
9. Finally, their salivary glands start making silk to spin cocoons. This intricate process requires careful control of the environment to ensure healthy silk production.
In simple words: To raise silkworms, you need a special house. Moths mate and lay eggs, which hatch into tiny worms. These worms eat a lot, grow, and then spin silk cocoons.

🎯 Exam Tip: When describing a biological process, always list the steps in chronological order and mention key environmental factors like temperature.

 

Question 11. What is meant by aquaponics? Describe its methods?
Answer: Aquaponics is a farming method that combines aquaculture (raising fish) with hydroponics (growing plants in water without soil). This creates a system where fish waste provides nutrients for the plants, and the plants filter the water for the fish. Here are its main methods:
1. **Deepwater Culture:** In this method, plants float in water, and their roots hang down into the water. This is good for fast-growing plants.
2. **Media-Based Method:** Here, plants grow in inert materials like clay pellets or shales. This system works well for home gardens and small-scale setups, and many fruiting and leafy plants can be grown.
3. **Nutrient Film Technique:** This involves a thin stream of nutrient-rich water flowing over the plant roots, usually in a narrow trough or PVC pipe. The roots stay in direct contact with the water stream.
4. **Aquavertica or Vertical Aquaponics:** In this advanced method, plants are stacked one above another in tower systems. It's great for leafy greens, strawberries, and other crops that don't need solid support. Aquaponics uses less water and land than traditional farming, making it very sustainable.
In simple words: Aquaponics grows fish and plants together in one system. Fish waste feeds the plants, and plants clean the water for the fish. Different ways to do this include floating plants in water, growing them in small rocks, or using thin streams of water.

🎯 Exam Tip: Clearly define aquaponics first, then break down each method with a brief explanation of how it works and what kind of plants it suits.

 

Question 12. Describe the structure of honey bee hive?
Answer: A honey bee hive, also known as a beehive or comb, is the home of honey bees. It is made of many hexagonal cells of wax that worker bees secrete from their bodies. These hives are usually found hanging vertically from rocks, buildings, or tree branches. Inside, the lower and central cells are where young bees grow, called brood cells. Beehives are a marvel of natural engineering, perfectly designed for the colony's needs.
In simple words: A beehive is where honey bees live. It is built from wax cells that are six-sided. These homes hang from high places and have special rooms for young bees.

🎯 Exam Tip: Focus on the key structural elements like hexagonal cells, wax, and the hanging nature of the hive.

 

Question 13. What is Natural breeding of fishes?
Answer: Natural breeding, often called Bundh breeding for fish, involves using special types of ponds or natural water bodies where fish can breed on their own. These bundhs are usually built in low-lying areas that collect a lot of rainwater. The shallower parts of these bundhs are used as spawning grounds, which are perfect for fish to lay their eggs. This method mimics the natural reproductive cycle of fish in a controlled environment.
In simple words: Natural breeding for fish means letting them lay eggs and hatch in special ponds or natural water spots, like how they would in the wild.

🎯 Exam Tip: Define natural breeding and mention the importance of bundhs and shallow areas for spawning in your answer.

 

Question 14. What are the characteristic features of cultivable fishes.
Answer: Cultivable fishes, those suitable for farming, have specific characteristics that make them ideal for cultivation. These include:

• They should grow quickly in a short period.
• They should accept extra food provided by farmers.
• They should be strong enough to resist common diseases and parasite infections.
• Fishes meant for polyculture (growing multiple species together) should not fight for food or interfere with each other.
• They should convert food into their body mass very efficiently, making them good for food production.

Such features ensure that fish farming is productive and economically viable.
In simple words: Good farm fish grow fast, eat extra food, don't get sick easily, and don't fight with other fish when raised together. They also turn their food into body mass well.

🎯 Exam Tip: List at least three to four distinct features, emphasizing growth rate, diet, disease resistance, and compatibility for polyculture.

 

Question 15. Why carps have proved to be best suited for culture in India?
Answer: Carps are considered best for fish farming in India due to several reasons:

• They eat zooplankton, phytoplankton, decaying weeds, and other plant debris, which are readily available in ponds.
• They can survive well in cloudy water and slightly higher temperatures.
• They can tolerate changes in oxygen levels in the water.
• They are easy to transport from one place to another.
• They are very nutritious and taste good, making them popular for consumption.

These qualities make carps a sustainable and profitable choice for aquaculture.
In simple words: Carps are good for farming in India because they eat many things found in ponds, can live in different water conditions, are easy to move, and are healthy and tasty to eat.

🎯 Exam Tip: Highlight their feeding habits, adaptability to water conditions, ease of transport, and palatability as key factors.

 

Question 16. Give an account of induced breeding.
Answer: Induced breeding is a method used to artificially stimulate fish to breed, especially to produce high-quality fish seeds. Here's how it generally works:

• This method aims to improve the quality of fish seed through artificial fertilization.
• Hormones called gonadotrophins (FSH+LH), released by the pituitary gland, help fish gonads mature and trigger spawning.
• The pituitary gland is taken from a healthy, mature fish.
• An extract is made by grinding this pituitary gland in a 0.3% saline solution and then spinning it in a centrifuge.
• This liquid extract is then injected into the fish at the base of the caudal fin.
• After injection, male and female fish start releasing their gametes (eggs and sperm), which are then fertilized.

This technique allows for controlled and efficient breeding, increasing fish production. It is a vital tool in modern aquaculture for managing fish populations and desired traits.
In simple words: Induced breeding is when scientists give hormones to fish to make them lay eggs and release sperm. This helps to get more fish babies and control their breeding for farming.

🎯 Exam Tip: Emphasize the role of pituitary hormones, the process of extraction and injection, and the outcome of fertilization in a controlled environment.

 

Question 17. What are the types of prawn fishery?
Answer: Prawn fisheries can be categorized based on their location and practices:
1. **Shallow Water Prawn Fishery:** This type of fishery is found along the west coast, limited to shallow waters.
2. **Estuaries Prawn Fishery:** This occurs in the backwater areas of the western coast, including lakes like Ennur, Pulicat, Chilka, and the estuaries of the Ganga and Brahmaputra rivers. It is common in these specific locations.
3. **Freshwater Prawn Fishery:** Prawns are caught from rivers and lakes across India in this type of fishery.
4. **Marine Prawn Fishery:** This involves catching prawns from the sea. Prawns belonging to the Penaeidae family are commonly caught along the Indian coast. Each type of fishery plays a role in meeting the demand for prawns, showcasing the versatility of prawn harvesting.
In simple words: Prawn fishing happens in different places: shallow sea areas, river mouths and lagoons (estuaries), freshwater rivers and lakes, and the open sea along the coast.

🎯 Exam Tip: List the different types of prawn fisheries and briefly mention their typical locations to provide a comprehensive answer.

 

Question 18. Give an account of the culture of freshwater prawns?
Answer: Freshwater prawn culture involves specific steps to ensure successful rearing:

• The species *Macrobrachium rosenbergii* is commonly found in rivers, fields, and areas where fresh water mixes with low-saline water.
• For breeding, one male and one female prawn are kept in a separate tank.
• After mating, the female lays eggs.
• The hatching tank needs to maintain a temperature between 24°C and 30°C and a pH level of 7-8. These conditions are crucial for egg development.
• The newly hatched larvae are fed artificial food.
• Young prawns, about 5 cm long, can then be raised in freshwater or slightly brackish water ponds.
• Harvesting of these prawns can be done twice a year.

This careful management helps in the efficient production of freshwater prawns for consumption.
In simple words: To grow freshwater prawns, you need to breed them in tanks with the right heat and water balance. The babies get special food, grow in ponds, and can be harvested two times a year.

🎯 Exam Tip: Include details about the prawn species, environmental conditions for hatching, feeding practices, and harvesting frequency.

 

Question 19. What are the methods of animal breeding?
Answer: Animal breeding involves two primary methods to improve livestock characteristics:
1. **Inbreeding:** This is when animals of the same breed are mated for 4-6 generations. It aims to increase homozygosity, meaning similar genes from both parents. However, it can expose harmful recessive genes and reduce fertility, a problem known as "inbreeding depression." This depression can be avoided by breeding selected animals with superior traits from the same breed but from unrelated lines, which helps restore fertility and yield.
2. **Outbreeding:** This involves mating unrelated animals. It has three main ways:
* **Outcrossing:** Breeding between unrelated animals of the same breed without any common ancestors for 4-6 generations. This helps improve productivity in animals that are below average.
* **Crossbreeding:** Breeding a superior male from one breed with a superior female from another breed. The offspring, called hybrids, often have better traits than either parent, a phenomenon known as hybrid vigor or heterosis.
* **Interspecific Hybridization:** This involves mating males and females from two different species. For example, a mule is produced by crossing a male donkey with a female horse. These methods are essential for developing animals with desired characteristics and improving overall livestock productivity.
In simple words: Animal breeding has two main ways: inbreeding, where close relatives mate to make traits more consistent but can cause problems, and outbreeding, where unrelated animals or different species mate to bring in new, good traits or create strong hybrids.

🎯 Exam Tip: Explain both inbreeding and outbreeding, detailing their aims, potential issues (for inbreeding), and specific sub-types (for outbreeding) like outcrossing, crossbreeding, and interspecific hybridization.

 

Question 20. What are the types of cultivable fish Types of cultivable fishes?
Answer: Cultivable fishes can be divided into several categories:
**Types of Cultivable Fishes:**

• **Indigenous / Native Freshwater Fishes:** These are major carps like Catla, Labeo, and Clarias, found naturally in freshwaters.
• **Saltwater Fishes Acclimatized for Freshwater:** These include species like Chanos and Mullet, which are typically found in saltwater but can adapt to live in freshwater environments for farming.
• **Exotic Fishes:** These are species imported from other countries, such as Common Carps, introduced for specific aquaculture purposes.

**Characteristic Features of Carps:**

• They feed on zooplankton, phytoplankton, decaying weeds, debris, and other aquatic plants. This diverse diet makes them easy to sustain.
• They can survive in cloudy water and at slightly higher temperatures.
• They can tolerate variations in oxygen levels in the water.
• They are easy to transport from one place to another.
• They are highly nutritious and taste good.

These characteristics make carps very suitable for various fish culture systems.
In simple words: Fish that can be farmed include local freshwater fish like carps, saltwater fish that can live in fresh water, and fish brought in from other countries. Carps are good because they eat many things, can live in different water types, are easy to move, and are tasty.

🎯 Exam Tip: Clearly distinguish between native, acclimatized, and exotic fishes. For carps, list their key feeding and survival advantages that make them cultivable.

 

Question 21. Give an account of the management of fish farms?
Answer: Managing fish farms requires understanding various aspects of fish culture, including the location, water quality, and biological factors. Here are the main stages involved:
**Stages of Fish Farming:**
**Breeding Pond:**
The first step is to prepare special breeding ponds for fish reproduction. These are usually built near natural water sources like rivers.
a) **Natural Breeding (Bundh Breeding):** These ponds are constructed in low-lying areas that collect a lot of rainwater. The shallow parts of these bundhs act as spawning grounds.
b) **Induced Breeding:** This involves artificially stimulating fish to breed by removing eggs and sperm from male and female fish and fertilizing them. This helps in controlled reproduction.
**Hatching Pit:**
After fertilization, the eggs are moved to hatching pits, which are smaller ponds with good quality water, located near the breeding grounds. There are two main types of hatching pits:
1. **Hatcheries:** Small ponds where unfertilized eggs are transferred for hatching.
2. **Hatching Hapas:** Rectangular, trough-shaped tanks made of mosquito net cloth, supported by bamboo poles and fixed in rivers, where hatching occurs.
**Nursery Pond:**
Newly hatched fish (fries) are transferred from hatching hapas to nursery ponds. Here, they grow into fingerlings, which are slightly larger young fish.
**Rearing Pond:**
This pond is long and narrow, kept free from toxic substances and predators. Fingerlings are moved here to grow further.
**Stocking Ponds:**
These ponds should be clear of weeds and predatory fish. Proper organic manure, like cow dung, is added to boost production.
**Harvesting:**
When fish reach a good size, they are caught for sale. Smaller fish are released back into stocking ponds to grow more. The harvested fish are then preserved and marketed. Effective fish farm management ensures healthy fish growth and high yields.
In simple words: Managing a fish farm means preparing ponds for fish to breed naturally or by human help. Eggs hatch in special pits, then baby fish grow in nursery and rearing ponds. Finally, grown fish are caught and sold, while smaller ones stay to grow more.

🎯 Exam Tip: Organize your answer by distinct stages of fish farming: breeding, hatching, growth (nursery/rearing/stocking), and harvesting. Briefly explain the purpose of each stage.

 

Question 22. a) What is meant by composite fish farming? b) What are the significance? c) What are the fishes cultured through composite fish farming.
Answer:
a) **What is meant by composite fish farming?**
Composite fish farming is a method where several different species of selected fish are stocked together in proper proportions within a single pond. This technique aims to utilize all available food resources (niches) in the pond efficiently. This maximizes fish production from the same body of water.
b) **What are its merits?**

• All available food resources (niches) in the pond are fully used because different fish species feed at different levels.
• Compatible species are chosen so they do not harm each other.
• There is no competition for food among the different species, as each has its preferred feeding zone or diet.

This method helps farmers get the most fish from their ponds efficiently.
c) **Fishes that are cultured:**
Commonly cultured fish in composite fish farming include:

• Catla Catla
• Labeo rohita
• Cirrhinus mrigala

These species are often chosen for their complementary feeding habits and growth rates. This ensures all parts of the pond's ecosystem are used well.
In simple words: Composite fish farming means raising many different types of fish together in one pond. This works well because each fish type eats different food or from different parts of the pond, so they don't fight and all the food gets used up. Fish like Catla, Labeo, and Cirrhinus are often raised this way.

🎯 Exam Tip: Define composite fish farming clearly. List at least two key merits and two examples of fish species typically used in such systems.

 

Question 23. Give an account of the economic importance of fish.
Answer: Fish hold significant economic importance due to their nutritional value and various industrial applications.
**Nutritional Value:**
1. Fishes are a rich source of protein. Species like sardines, mackerel, tuna, and herrings contain high concentrations of amino acids, essential for human health.
2. These fishes also contain histidine, which gives them their distinctive meaty flavor, and are rich in omega-3 fatty acids, known for their health benefits.
3. Fish are packed with important minerals such as calcium, magnesium, phosphorus, potassium, iron, manganese, iodine, and copper.
**Fish Products:**
a) **Fish Oil:** This is an important product obtained from fish liver and the fish body. It is rich in vitamins A and D and iodine. Fish oil is used in making laundry soap, paints, and cosmetics.
b) **Fish Meal:** Prepared from fish waste after oil extraction, fish meal is used as feed for pigs, poultry, and cattle. The remaining waste from fish meal preparation is also used as manure.
c) **Isinglass:** This is a high-grade collagen product derived from the dried air bladder of catfish and carps. It is primarily used for clarifying wine, beer, and vinegar. The diverse uses of fish highlight their multifaceted value beyond just food.
In simple words: Fish are important because they give us protein, healthy fats like omega-3, and many minerals. We also get fish oil for soaps and paint, fish meal to feed farm animals, and isinglass to clear drinks like wine.

🎯 Exam Tip: Structure your answer by first discussing the nutritional benefits (protein, fats, minerals) and then explaining specific fish products and their uses (oil, meal, isinglass).

 

Question 24. Give notes on a) Pearl Culture b) Formation of pearl.
Answer:
a) **Pearl Culture:**
Pearl culture is the controlled process of cultivating pearls from oysters. A pearl is a shiny, round substance found inside the shell of an oyster. In India, pearl culture began in 1973 in Thoothukudi. High-quality pearls are usually obtained from oysters of the genus *Pinctada*. These oysters can be cultured in saltwater with a salinity of 30 parts per thousand (ppt) using methods like racks, rafts, and long-line techniques. Pearl oysters naturally live on rocky ridges or dead corals, which are ideal places for producing the best quality pearls.
b) **Formation of Pearl:**
A pearl forms when a small foreign particle accidentally enters the space between the oyster's mantle and its shell. The mantle epithelium (a tissue layer) then encloses this particle in a sac and starts secreting concentric layers of nacre around it. Nacre is a strong, iridescent substance. The continuous deposition of nacre layers, which are made of calcium carbonate, builds up around the foreign particle, forming a hard and glossy pearl. This process is a natural defense mechanism by the oyster. If the nucleus for pearl formation is calcareous, the deposition of nacre is even greater.
In simple words: Pearl culture means raising oysters to make pearls. A pearl starts when something small gets inside an oyster, and the oyster covers it with many shiny layers called nacre, making a pearl.

🎯 Exam Tip: For pearl culture, mention its definition, location in India, and the genus of oyster. For pearl formation, describe the entry of a foreign particle and the role of nacre secretion by the mantle epithelium.

 

Question 25. Give an account of artificial pearl culture?
Answer: Artificial pearl culture is a meticulous process involving several steps to produce pearls under controlled conditions:
1. **Oyster Collection:** Oysters are collected using special cages. These cages are dipped into a sand-cement mixture to create a rough surface, then suspended at a depth of 6 meters in the water. This provides a suitable environment for the oysters.
2. **Rearing of Oysters:** The collected oysters are placed in culture cages for about 10-20 days. These cages protect them from predators like octopuses, eels, and devil fishes.
3. **Insertion of Nucleus:**
a) **Fitness of Oysters:** Oysters chosen for nucleus insertion must be healthy and strong to withstand the stress of the operation.
b) **Preparation of Graft Tissues:** A small piece of tissue, called a "graft," is taken from the mantle of another oyster. This graft tissue, with its nacre-secreting cells, is placed in contact with the nucleus.
c) **Preparation of Nucleus:** Any small particle can act as a nucleus to start pearl formation. If the nucleus is calcareous (made of calcium), nacre deposition is more effective.
d) **Insertion:** Oysters are held securely in a desk clamp. The mantle folds are gently moved to expose the foot. An incision is made in the epithelium of the foot, and the nucleus, along with the graft tissue, is carefully inserted.
4. **Post-Operation Care:** Nucleated oysters are placed in cages and suspended 2-3 meters deep for 6-7 days. This is known as the "Recovery Period." After this, they are kept undisturbed for 3-6 years.
5. **Harvesting of Pearl:** Once the pearls are fully formed, they are harvested. This typically happens between December and February.
6. **Clearing of Pearls:** After removing them from the oyster shells, the pearls are washed thoroughly with soap solution to clean them. This controlled environment ensures a consistent production of high-quality pearls.
In simple words: Artificial pearl making involves catching oysters, keeping them safe, and then carefully putting a small piece (nucleus) inside them. After this, the oysters are kept in water for a long time to make the pearl, which is then collected and cleaned.

🎯 Exam Tip: Break down the complex process into logical stages (collection, rearing, nucleus insertion, post-op care, harvesting, clearing). Mention the purpose of each step for clarity.

 

Question 26. What is inbreeding? What are its merits and demerits?
Answer: Inbreeding is a method of animal breeding where animals of the same breed are mated for 4-6 generations. This means closely related individuals are bred together.
**Merits:**

• It increases **homozygosity**, meaning the offspring are more likely to have identical genes from both parents for certain traits. This helps to create pure lines for specific traits.
• It can help to expose harmful recessive genes. If a harmful recessive gene is present, inbreeding makes it more likely to appear in the offspring, allowing breeders to remove those animals from the breeding program.

**Demerits:**
1. **Continuous inbreeding reduces fertility**, meaning animals may have fewer offspring or struggle to reproduce.
2. It leads to **inbreeding depression**, a decrease in traits like growth rate, milk production, and overall vigor. This happens because harmful recessive genes become more common. To avoid inbreeding depression, selected animals with superior traits from the same breed, but with unrelated ancestry, are bred together. This helps to maintain fertility and production levels. Inbreeding must be managed carefully to maximize benefits while minimizing risks.
In simple words: Inbreeding is breeding animals that are very closely related. It helps make traits pure but can also cause problems like lower fertility and weaker offspring. To fix this, good animals from different families are sometimes bred.

🎯 Exam Tip: Clearly define inbreeding, then list its advantages (increasing homozygosity, exposing recessive genes) and disadvantages (reduced fertility, inbreeding depression). Briefly explain how to counter inbreeding depression.

 

Question 27. What is Dairying and Dairy Operation?
Answer: Dairying refers to the part of agriculture focused on producing and marketing milk and its various products. A dairy operation includes all the activities involved in this process. This involves properly caring for and maintaining dairy cattle, collecting the milk they produce, and then processing that milk into various dairy products, as well as managing any by-products. The goal is to efficiently produce milk and other goods for consumption.
In simple words: Dairying is about farming milk and making milk products. A dairy operation covers everything from taking care of cows, collecting milk, and turning it into things like cheese and butter.

🎯 Exam Tip: Provide a concise definition of dairying and then list the main components of a dairy operation, such as animal care, milk collection, and processing.

 

Question 29. Give an account of Multiple Ovulation embryo transfer technology? MOET.
Answer: MOET is a method applied when the success rate of breeding is low, even with artificial insemination. In this technique, a special hormone is given to cows to make many egg cells mature at once. Instead of just one egg per cycle, 6-8 eggs can be produced. These eggs are then collected carefully, without surgery, from the genetic mother and fertilized artificially. The embryos, when they are at the 8-32 cell stage, are moved to a surrogate mother. This technology helps produce high milk-yielding females and high-quality meat-yielding bulls quickly.
In simple words: MOET is a way to make cows produce more eggs, fertilize them, and then transfer them to other mothers to get more good quality calves faster. It helps improve breeds quickly.

🎯 Exam Tip: Remember MOET is about increasing offspring quickly by getting many eggs from one mother and using other mothers to carry them.

 

Question 30.
a) What is meant by dairying?
b) Classify them on the basis of their utility.
c) Give an account of dairy products.
Answer:
a) Dairying is the process of producing and selling milk and its related products. Dairy operations include properly caring for cattle, collecting milk, and processing it, along with making by-products.
b) Cattle are classified into three main types based on their utility:
1. Dairy breeds: These cows produce a lot of milk and have a long period of milk production. Examples include Sindhi, Jersey, and Sahiwal breeds.
2. Drought breeds: These are cattle whose male offspring (bullocks) are good for pulling plows and other farm work. An example is the Kangeyam Malvi.
3. Dual-purpose breeds: These cattle are good for both milk production (cows) and farm work (bullocks). An example is the Ongole Hariana.
c) Uses of dairy products:
1. Milk: Milk is an excellent source of vitamins A, B2, and B, though it lacks Vitamin C. Many dairy products like yogurt, cheese, butter, ice cream, condensed milk, and milk powder are made from it.
2. Meat: Meat is a good source of protein and essential minerals like iron, zinc, and selenium.
3. Land Management: Allowing livestock to graze can sometimes help control unwanted weeds in fields.
4. Manure: Animal manure can be used as a natural fertilizer to increase crop yields in agriculture fields.
In simple words: Dairying means managing cows for milk. Cows are categorized by whether they give milk, help with farm work, or do both. Milk is used for many food items and provides important nutrients. Cows also help with land by grazing and provide manure for farms.

🎯 Exam Tip: When discussing cattle utility, remember the distinct categories of 'dairy', 'draught', and 'dual-purpose' breeds and their primary contributions.

 

Question 31. Describe the types of Chicken breeds?
Answer: Chicken breeds are mainly classified based on their use. Here are some types:
1. Egg Layers: These breeds are primarily raised for producing eggs.
* Leghorn: This breed comes from Italy. They are small and have a single comb on their head. They grow quickly and start laying eggs at 5 or 6 months old.
* Chittagong: These chickens are good at laying eggs and are also considered tasty. They are commonly found in West Bengal.
2. Broiler Type: These breeds are raised for meat. They grow fast and have soft, good quality meat.
* White Plymouth Rock: This is an American breed known for its white feathers across its body. It grows quickly.
3. Dual-Purpose Breed: These chickens are good for both meat and eggs. They have large bodies with heavy bones and many feathers.
4. Game Breeds: These are traditionally used for cockfighting, though this is now largely illegal in many places. They have high stamina and a majestic way of walking.
* Aseel: These hens do not lay many eggs but are very good at incubating them. They are famous for their fighting spirit and strong presence.
5. Ornamental Breeds: These chickens are kept as pets because of their beautiful appearance.
* Silkie: These birds have soft, fluffy feathers that feel like silk. They have black skin, black bones, blue earlobes, and five toes on each foot.
In simple words: Chicken breeds are grouped by what they are best for: laying eggs (like Leghorns), providing meat (like White Plymouth Rocks), doing both (dual-purpose), fighting (game breeds like Aseel), or simply being pretty pets (like Silkies).

🎯 Exam Tip: When describing breeds, always mention their main purpose (egg, meat, dual, ornamental) and one or two unique characteristics for each type.

 

Question 33. Write a note on milk products?
Answer: Milk products are made from the milk of dairy animals. Milk itself is a mix of fat and lactose, and it contains enzymes that are removed during pasteurization to make it safer. Milk is a great source of vitamins A, B, and Bp, and it is considered a complete food for babies. Many other items like yogurt, cheese, butter, ice cream, condensed milk, curd, and milk powder are made from milk. The variety of milk products makes dairy farming very popular and important for food.
In simple words: Milk products are foods made from animal milk, like cheese, butter, and yogurt. Milk is full of vitamins and good for health. Turning milk into many products makes dairy farming important.

🎯 Exam Tip: When discussing milk products, highlight milk's nutritional value and list a few common products to show understanding.