Samacheer Kalvi Class 9 Science Solutions Chapter 23 Economic Biology

I. Choose The Correct Answer :

 

Question 1. The production and management of fish is called
(a) Pisciculture
(b) Sericulture
(c) Aquaculture
(d) Monoculture
Answer: (a) Pisciculture
In simple words: The process of growing and taking care of fish, often in ponds or tanks, is known as pisciculture. This practice helps to provide food and other products from fish.

🎯 Exam Tip: Remember to clearly distinguish between terms like pisciculture (fish), sericulture (silkworms), and aquaculture (general aquatic organisms) as they relate to different types of farming.

 

Question 2. Which one of the following is not an exotic breed of cow?
(a) Jersey
(b) Holstein-Friesan
(c) Sahiwal
(d) Brown Swiss
Answer: (c) Sahiwal
In simple words: Sahiwal is a native Indian breed of cow, while Jersey, Holstein-Friesian, and Brown Swiss are all breeds that originally came from other countries. This cow is well-suited to local conditions.

🎯 Exam Tip: When identifying exotic vs. indigenous breeds, focus on their origin. Exotic breeds are introduced from other countries, while indigenous breeds are native to a specific region, like India.

 

Question 3. Which one of the following is an Italian species of honey bee?
(a) Apis mellifera
(b) Apis dorsata
(c) Apis florae
(d) Apis cerana
Answer: (a) Apis mellifera
In simple words: Among the choices, Apis mellifera is known as the European or Italian honey bee. It is widely used in beekeeping around the world because it is gentle and produces a lot of honey.

🎯 Exam Tip: Familiarize yourself with the common names and origins of different honey bee species, especially those important for apiculture.

 

Question 4. Which one of the following is not an Indian major carp?
(a) Rohu
(b) Catla
(c) Mrigal
(d) Singhara
Answer: (d) Singhara
In simple words: Rohu, Catla, and Mrigal are all considered major Indian carp fish species, commonly found and farmed in India. Singhara is not typically categorized as an Indian major carp.

🎯 Exam Tip: Know the specific names of major Indian carp species often mentioned in aquaculture studies. This helps to identify local fish varieties.

 

Question 5. Drones in the honey bee colony are formed from
(a) unfertilized egg
(b) fertilized egg
(c) parthenogenesis
(d) both b and c
Answer: (a) unfertilized egg
In simple words: Drones, which are the male bees in a honey bee colony, develop from eggs that have not been fertilized. This process is a natural way for them to reproduce without needing sperm.

🎯 Exam Tip: Understand the reproductive biology of honey bees, specifically how queens, drones, and worker bees are formed, as this is a key concept in social insects.

 

Question 6. Which of the following is an high milk yielding variety of cow?
(a) Holstein-Friesan
(b) Dorset
(c) Sahiwal
(d) Red Sindhi
Answer: (a) Holstein-Friesan
In simple words: The Holstein-Friesian cow is widely recognized for producing a very large amount of milk, making it a popular choice for dairy farming around the world. It is known for its black and white markings.

🎯 Exam Tip: When studying cattle breeds, remember to associate them with their primary characteristics, such as high milk yield for dairy breeds or drought resistance for draft breeds.

 

Question 7. Which Indian variety of honeybee is commonly used for apiculture?
(a) Apis dorsata
(b) Apis florea
(c) Apis niellifera
(d) Apis indica
Answer: (d) Apis indica
In simple words: Apis indica, also known as the Indian honey bee, is a local variety often chosen for beekeeping in India. It adapts well to the climate and conditions there.

🎯 Exam Tip: Be precise with the scientific names of species, especially when asked about specific varieties used for farming or other economic purposes.

 

Question 8. ............... is the method of grafting plants without soil.
(a) Horticulture
(b) Hydroponics
(c) Pomology
(d) None of these
Answer: (b) Hydroponics
In simple words: Hydroponics is a way of growing plants by using water mixed with nutrients, without needing any soil. This technique allows plants to grow in controlled environments.

🎯 Exam Tip: Understand the definitions of different plant cultivation techniques. Hydroponics is distinct because it completely removes soil from the growing process.

 

Question 9. The symbiotic association of fungi and vascular plants is
(a) Lichen
(b) Rhizobium
(c) Mycorrhizae
(d) Azotobacter
Answer: (c) Mycorrhizae
In simple words: Mycorrhizae describe a helpful partnership where fungi grow around or inside the roots of plants. This connection helps the plants get more water and nutrients from the soil.

🎯 Exam Tip: Recall that symbiotic relationships involve two different organisms living closely together. Mycorrhizae specifically refer to the beneficial relationship between fungi and plant roots.

 

Question 10. The plant body of mushroom is
(a) Spawn
(b) Mycelium
(c) Leaf
(d) All of these
Answer: (b) Mycelium
In simple words: The main part of a mushroom that grows underground or inside its food source is called the mycelium. The visible mushroom that we see is actually just the fruiting body of this larger mycelial network.

🎯 Exam Tip: Distinguish between the visible fruiting body (the mushroom cap and stem) and the hidden, main part of the fungus, the mycelium, which is essential for its growth and nutrient absorption.

II. Fill In The Blanks :

 

Question 1. Quinine drug is obtained from ............................
Answer: Cinchona (cinjona maram)
In simple words: The important medicine called Quinine comes from the bark of the Cinchona tree. This tree is known for its special medicinal properties.

🎯 Exam Tip: Remember the specific plant sources for important medicinal drugs, as these are common facts in biology.

 

Question 2. Carica papaya leaf can cure ............................ disease.
Answer: Dengue
In simple words: Papaya leaves have compounds that are believed to help treat the Dengue fever. They can increase platelet count, which is crucial during the illness.

🎯 Exam Tip: Note the medicinal uses of common plants. Papaya leaves are specifically associated with boosting platelet count in dengue patients.

 

Question 3. Vermicompost is a type of soil made by ............................ and microorganisms.
Answer: Earthworm
In simple words: Vermicompost is a special kind of nutrient-rich soil created when earthworms and tiny living things like bacteria break down organic waste. This makes excellent fertilizer.

🎯 Exam Tip: Focus on the main agents involved in vermicomposting: earthworms. They play a crucial role in converting organic matter into valuable compost.

 

Question 4. ............................ refers to the culture of prawns, pearl and edible oysters.
Answer: Aquaculture
In simple words: Aquaculture is the general term for farming aquatic animals and plants, including prawns, pearl oysters, and edible oysters. It is like farming in water.

🎯 Exam Tip: Differentiate aquaculture (general aquatic farming) from narrower terms like pisciculture (fish farming). Aquaculture encompasses a wider range of aquatic organisms.

 

Question 5. The largest member in a honey bee hive is is the ............................
Answer: Queen Bee
In simple words: The Queen Bee is the largest bee in a hive and the only female bee that lays eggs. She is essential for the growth and survival of the colony.

🎯 Exam Tip: Remember the roles of different bees in a colony: queen (lays eggs, largest), drones (males, fertilize queen), and worker bees (females, do all other tasks).

 

Question 6. ............................ is a preservative in honey.
Answer: Formic acid
In simple words: Formic acid naturally found in honey helps to keep it from spoiling. This natural acid acts as a preservative, allowing honey to be stored for a long time.

🎯 Exam Tip: Note the natural components of honey that contribute to its properties, such as formic acid for preservation.

 

Question 7. ............................ is the method of culturing different variety of fish in a water body.
Answer: Polyculture
In simple words: Polyculture is a farming method where different types of fish are grown together in the same body of water. This helps use the resources efficiently and can increase overall production.

🎯 Exam Tip: Polyculture is beneficial for maximizing resource utilization and often reduces pest problems by creating a more balanced ecosystem.

III. Say True Or False. If False, Correct The Statement:

 

Question 1. Mycorrhiza is an algae.
Answer: False.
Correct statement: Mycorrhiza is a fungus.
In simple words: Mycorrhiza is actually a type of fungus that forms a helpful partnership with plant roots, not an algae. It helps plants absorb water and nutrients from the soil.

🎯 Exam Tip: Clearly know the classification of organisms. Mycorrhiza is a fungus, and lichens are a symbiotic relationship between a fungus and an algae or cyanobacterium.

 

Question 2. Milch animals are used in agriculture and transport.
Answer: False.
Correct statement: Milch animals are used in milk production.
In simple words: Milch animals are primarily raised for their milk. Other types of animals, like bullocks, are used for farm work and carrying things.

🎯 Exam Tip: Distinguish between different categories of farm animals based on their primary use: milch animals for milk, draft animals for labor, and meat animals for food.

 

Question 3. Apis florea is a rock bee.
Answer: False.
Correct statement: Apis dorsata is a rock bee.
In simple words: Apis dorsata is known as the rock bee because it builds large, open nests on cliffs and rocks. Apis florea is the dwarf honey bee, making small, single comb nests.

🎯 Exam Tip: Pay attention to the specific characteristics and common names of different honey bee species to avoid confusion.

 

Question 4. Ongole is an exotic breed of cattle.
Answer: False.
Correct statement: Ongole is an Indian breed of cattle.
In simple words: Ongole cattle are an indigenous breed, meaning they are native to India, known for their strength and heat tolerance. They are not an exotic breed.

🎯 Exam Tip: Ensure you can correctly classify cattle breeds as either indigenous (native) or exotic (foreign) based on their geographical origin.

 

Question 5. Sheep manure contains high nutrients than farm yard manure.
Answer: True.
In simple words: Sheep manure is indeed richer in important plant nutrients compared to farmyard manure. This makes it a more concentrated fertilizer for crops.

🎯 Exam Tip: Understand the comparative nutrient content of different types of animal manure, which influences their use in agriculture.

IV. Differentiate The Following :

 

Question (a) Exotic breed and Indigenous breed.
Answer:

In simple words: Exotic breeds are cattle brought from foreign countries, often for specific traits like high milk production. Indigenous breeds are local to India and are generally more adapted to the local climate and conditions.

🎯 Exam Tip: When differentiating, always provide a clear definition or characteristic for each term and include specific examples to illustrate the differences.

 

Question (b) Pollen and Nectar
Answer:

In simple words: Pollen is the powdery substance that helps plants reproduce, while nectar is a sweet liquid that attracts insects and animals to help spread pollen. Both are vital for plant reproduction and for bees.

🎯 Exam Tip: Focus on the composition, origin (part of the flower), and primary function of each substance when comparing them.

 

Question (c) Shrimp and Prawn
Answer:

In simple words: Shrimps are generally smaller and live in saltwater, especially deep in the ocean. Prawns are larger and can live in a wider range of water environments, including fresh and brackish water.

🎯 Exam Tip: The key difference between shrimp and prawns often lies in their habitat preferences (marine vs. varied water bodies) and some anatomical features, though common usage can vary.

 

Question (d) Farmyard manure and Sheep manure
Answer:

In simple words: Farmyard manure is a general mix of animal waste, mainly from cattle, and is lower in nutrients. Sheep manure, on the other hand, comes from sheep or goats and is much richer in important nutrients like nitrogen, making it a stronger fertilizer.

🎯 Exam Tip: When comparing different manures, always mention their source and, most importantly, their comparative nutrient content (e.g., nitrogen, phosphorus, potassium percentages).

V. Match The Following :

 

Question. Match the following columns:

Answer:In simple words: This matching exercise connects different biological and agricultural terms with their correct classifications or related concepts. For example, Lobsters are shellfish, Catla is a fin fish, and Olericulture is vegetable farming.

🎯 Exam Tip: For matching questions, it's helpful to go through each item in Column A and find its direct association in Column B. Knowledge of classifications and uses is key.

VI. Answer Briefly :

 

Question 1. What are the secondary metabolites?
Answer: Most medicines are obtained either directly or indirectly from plants and animals. All major systems of medicine, such as Ayurveda, Yoga, Unani, Siddha, and Homeopathy (AYUSH), use drugs sourced from plants and animals. These useful substances from medicinal plants are called secondary metabolites. For example, alkaloids and flavonoids are well-known secondary metabolites.
In simple words: Secondary metabolites are special compounds found in plants and animals that are not directly needed for their basic survival but are often used to make medicines.

🎯 Exam Tip: When defining secondary metabolites, emphasize that they are not primary for growth but have significant medicinal or ecological roles, and provide a common example.

 

Question 2. What are the types of vegetable gardens?
Answer: There are several types of vegetable gardens, each serving different purposes and methods. These include:
1. Kitchen or Nutrition gardening
2. Commercial gardening
3. Vegetable forcing
4. Greenhouse (or) Poly House
5. Organic Vegetable Gardening.
In simple words: Vegetable gardens can be small for home use, large for selling produce, grown in special heated spaces, or farmed using only natural methods.

🎯 Exam Tip: List all types of gardens mentioned clearly and ensure each type is distinct, highlighting how they differ in scale or method.

 

Question 3. Mention any two mushroom preservation methods.
Answer: Two common methods used to preserve mushrooms are:
1. Drying
2. Vacuum Cooling. This method helps to quickly reduce the temperature, slowing down spoilage.
In simple words: Mushrooms can be kept fresh for longer by drying them out or by using a method called vacuum cooling.

🎯 Exam Tip: When asked for "any two," provide distinct and well-known methods, and a brief explanation if possible.

 

Question 4. Enumerate the advantages of vermicompost over chemical fertilizer.
Answer: Vermicompost offers several benefits when compared to chemical fertilizers:

• Vermicompost is free from harmful germs and toxic chemicals.
• It improves how organic matter breaks down in the soil.
• It is rich in beneficial tiny living things (microflora).
• It contains valuable vitamins, enzymes, and growth-promoting substances. These all contribute to healthier plant growth.

In simple words: Vermicompost is better than chemical fertilizers because it is natural, has no bad chemicals, makes the soil healthy, and helps plants grow well with its natural nutrients.

🎯 Exam Tip: When comparing, highlight the natural, organic benefits of vermicompost against the potential environmental and health concerns of chemical fertilizers.

 

Question 5. What are the species of earthworm used for vermiculture?
Answer: Out of the many types of earthworms, only a few species are suitable for vermicompost production. The main species used are:
1. Perionyx excavatus (also known as the Indian blue worm)
2. Eisenia fetida (commonly called red worms)
3. Eudrilus eugeniae (known as the African nightcrawler). These worms are efficient at breaking down organic waste.
In simple words: For making vermicompost, specific types of earthworms like the Indian blue worm, red worms, and African nightcrawlers are used because they are very good at breaking down waste.

🎯 Exam Tip: Memorize the scientific and common names of the earthworm species commonly employed in vermiculture, as this is a specific factual recall question.

 

Question 6. List the medicinal importance of honey.
Answer: Honey has several important medicinal properties:

• Honey acts as a natural antiseptic and has antibacterial properties, meaning it can kill germs.
• It helps in purifying the blood.
• It assists in increasing the hemoglobin content in the blood.
• It is effective in preventing and relieving coughs, colds, and sore throats. It also soothes internal irritations.
• It serves as a remedy for ulcers found in the tongue, stomach, and intestines.
• It aids in improving digestion and boosting appetite.

In simple words: Honey is good for health because it fights germs, cleans the blood, boosts blood iron, helps with coughs and stomach problems, and improves digestion.

🎯 Exam Tip: Provide a comprehensive list of medicinal uses, ensuring you include a range of benefits from antiseptic properties to digestive aids.

VII. Answer In Detail :

 

Question 1. Enumerate the advantage of hydroponics.
Answer: Hydroponics, a method of growing plants without soil, was first shown by German Botanist Julius Von Sachs in 1980. Its many advantages include:

• Crops can be grown in places where there is little land or where the soil is very polluted.
• The environment, including temperature, humidity, light intensity, and air composition, can be perfectly controlled.
• It allows for better conservation of water and nutrients, as they are recycled.
• Plant growth can be carefully managed.
• There are no weeds to worry about.
• It results in fewer pests and diseases.
• There is minimal need to use insecticides or herbicides.
• In dry areas like deserts and very cold Arctic regions, hydroponics is a good alternative farming method.
• Hydroponics is used successfully to grow seedless cucumbers and tomatoes for sale.

In simple words: Hydroponics lets us grow plants anywhere, saves water, stops weeds and pests, and gives a bigger harvest, especially in places where soil farming is hard.

🎯 Exam Tip: When listing advantages, categorize them if possible (e.g., environmental control, resource efficiency, pest management) to make your answer structured and easy to understand.

 

Question 2. Define Mushroom culture. Explain the mushroom cultivation methods.
Answer: Mushroom culture is the process of growing mushrooms to produce food, medicine, and other useful products. Mushrooms are a type of fungus that belongs to the group called basidiomycetes. They are rich in proteins, fibers, vitamins, and minerals, making them a nutritious food. Mushrooms can be grown either on paddy straw or on wood logs. The main steps in mushroom cultivation are:

• Composting: First, a special compost is made by mixing paddy straw with other organic materials like cow dung and inorganic fertilizers. This mixture is kept at about 50°C for one week.
• Spawning: Spawn is like the "seed" for mushrooms. It's prepared by growing fungal mycelium (the root-like structure of the fungus) on grains in clean, sterile conditions. This spawn is then spread onto the compost.
• Casing: The compost with the spawn is covered with a thin layer of soil. This layer helps support the growing mushrooms, keeps the humidity right, and helps control the temperature.
• Pinning: After casing, the mycelium starts to form small buds, which are called pins. These pins will grow into full mushrooms.
• Harvesting: Mushrooms grow best in temperatures between 15°C and 23°C. They can grow about 3 cm in a week, which is their normal harvest size. The first batch of mushrooms can usually be harvested in the third week after spawning.

In simple words: Mushroom culture means growing mushrooms for food and medicine. It involves preparing compost, planting mushroom "seeds" (spawn), covering them with soil (casing), letting small buds grow (pinning), and then harvesting the mushrooms when they are ready.

🎯 Exam Tip: Clearly define mushroom culture and then explain each stage of cultivation in a step-by-step manner, using bolded terms for clarity.

 

Question 3. What are the sources of organic resources for vermicomposting?
Answer: Biologically degradable organic wastes are used as valuable organic resources for vermicomposting. These materials are broken down by earthworms to create nutrient-rich compost. The sources include:

• Agricultural wastes: This includes crop residues, waste from vegetables, and sugarcane trash.
• Crop residues (detailed): More specifically, this covers rice straw, tea wastes, residues from cereals and pulses, rice husk, tobacco wastes, and coir wastes.
• Leaf litter: Fallen leaves from trees and plants.
• Fruit and vegetable wastes: Scraps and leftover parts from fruits and vegetables.
• Animal wastes: This category includes cattle dung, poultry droppings, pig slurry, and droppings from goats and sheep.
• Biogas slurry: The liquid waste left over after biogas production.

In simple words: Many natural waste materials can be used for vermicomposting, such as leftover farm crops, vegetable and fruit scraps, animal poop, and even waste from biogas plants.

🎯 Exam Tip: When listing sources, provide a broad category first, then give specific examples within each category to demonstrate comprehensive knowledge.

 

Question 4. Give an account of different types of fish ponds used for rearing fishes.
Answer: Fish farms require different types of ponds to manage the various stages of fish growth and development. These ponds ensure that fish are reared effectively from egg to marketable size:
1. Breeding pond: In this pond, healthy and sexually mature male and female fish are brought together to breed. The female releases eggs, which are then fertilized by the male's sperm. These fertilized eggs float on the water like a frothy mass.2. Hatchling pits: After fertilization, the eggs are moved to these pits for hatching. There are two main types: hatcheries (larger facilities) and hatching hapas (smaller, net enclosures).3. Nursery ponds: The newly hatched fish, called hatchlings, are moved to nursery ponds after 2 to 7 days. They stay here for about 60 days, receiving proper food until they grow into fry, reaching a length of 2-2.5 cm.4. Rearing ponds: These ponds are used to raise the fry. The fish fry are transferred from the nursery pond to the rearing ponds and kept for about three months until they grow into fingerlings, reaching 10 to 15 cm in length.5. Stocking pond: Also known as a culture pond or production pond, this is where fingerlings are grown until they reach a marketable size. Before the fingerlings are introduced, the pond is treated with organic manure and inorganic fertilizers to prepare it for growth.In simple words: Fish farms use different ponds for different stages of fish life: breeding ponds for mating, hatchling pits for eggs to hatch, nursery ponds for baby fish, rearing ponds for growing young fish, and stocking ponds for growing them to full size before selling.

🎯 Exam Tip: Describe each type of pond, its specific purpose in the fish life cycle, and the stage of fish (eggs, hatchlings, fry, fingerlings) that inhabits it to show a clear understanding of the process.

VIII. Higher Order Thinking Skills:

 

Question 1. Biomanuring plays an important role in agriculture. Justify.
Answer: Biomanuring helps to reduce pollution in soil, water, and air. It protects the health of the soil and makes it more fertile. This process also leads to the healthy production of vegetables and fruits. Additionally, it enriches the soil by adding nutrients like nitrogen. This natural method supports a more balanced ecosystem.
In simple words: Biomanuring keeps the soil, water, and air clean. It makes the soil healthy and helps grow good vegetables and fruits by adding natural nutrients.

🎯 Exam Tip: When justifying the importance of biomanuring, remember to mention its benefits for pollution reduction, soil health, and nutrient enrichment.

 

Question 2. Each bee hive consists of hexagonal cells. Name the material in which the cell is formed and mention the significance of the hexagonal cells.
Answer: The comb of the bees is formed mostly from wax, which is produced by wax glands in the abdomen of worker bees. A comb is a vertical sheet made of wax with a double layer of hexagonal cells. These hexagonal cells are important because they are used to store honey and also to raise young bees. The six-sided shape allows for maximum storage in a small area.
In simple words: Bee combs are made of wax from worker bees. The hexagonal cells in the comb store honey and act as tiny homes for baby bees.

🎯 Exam Tip: Focus on both the material (wax from worker bees) and the dual significance of hexagonal cells (storage and raising young) for a complete answer.

9th Science Guide Economic Biology Additional Important Questions And Answers

I. Choose The Correct Answer:

 

Question 1. Olericulture refers to the farming of
(a) Vegetable
(b) Flowers
(c) Fruits
(d) All of the options
Answer: (a) Vegetable
In simple words: Olericulture is the specific type of farming where people grow vegetables. It's all about producing plants for food.

🎯 Exam Tip: Remember "Olericulture" specifically means vegetable cultivation, distinguishing it from floriculture (flowers) or pomology (fruits).

 

Question 2. India is the largest producer of vegetables next to China.
(a) First
(b) Second
(c) Third
(d) Fourth
Answer: (b) Second
In simple words: India grows the second most vegetables in the world, right after China. This means it's a huge vegetable-producing country.

🎯 Exam Tip: Knowing India's global ranking in agricultural products like vegetables helps demonstrate general knowledge in economic biology.

 

Question 3. Tuber rose is cultivated from
(a) Madurai zone
(b) Hill area zone
(c) Coimbatore zone
(d) Hosurzone
Answer: (c) Coimbatore zone
In simple words: Tuberose flowers are grown in the Coimbatore area. This zone is a good place for farming these specific flowers.

🎯 Exam Tip: When answering questions about specific agricultural zones, remember to link the crop to its primary cultivation region.

 

Question 4. Green manure also helps in reclamation of soils.
(a) Acidic
(b) Alkaline
(c) neutral
(d) None of the options
Answer: (b) Alkaline
In simple words: Green manure helps to fix alkaline soils, making them better for plants to grow. It balances the soil's natural properties.

🎯 Exam Tip: Green manure's role in soil health is versatile; remember its specific benefit in reclaiming alkaline soils by improving soil structure and nutrient availability.

 

Question 5. Azolla having a cyanobacterial symbiotic association with
(a) Azotobacter
(b) Azospirillum
(c) Mycorrhizae
(d) Anabaena
Answer: (d) Anabaena
In simple words: Azolla works together with Anabaena, which is a type of blue-green algae. This teamwork helps Azolla get nitrogen from the air.

🎯 Exam Tip: Understand that symbiotic associations are crucial in nature; for Azolla, specifically remember its partnership with Anabaena for nitrogen fixation.

 

Question 6. Quinine is a best drug for treatment of
(a) Dengue
(b) Psoriasis
(c) Malaria
(d) Leukemia
Answer: (c) Malaria
In simple words: Quinine is the best medicine for treating malaria. It has been used for a long time to fight this sickness.

🎯 Exam Tip: Quinine is a classic example of a plant-derived medicine; link it directly to its primary use in treating malaria.

 

Question 7. Nilavembu kashayam is given to patients/people to protect from.
(a) Dengue
(b) Chikungunya
(c) Diabetes
(d) All of the options
Answer: (d) All of the options
In simple words: Nilavembu kashayam helps protect people from many illnesses, such as Dengue, Chikungunya, and Diabetes. It acts as a general health protector.

🎯 Exam Tip: For traditional remedies like Nilavembu kashayam, remember their broad protective actions rather than just one specific ailment.

 

Question 8. Reserpine is derived from
(a) Cathyranthusroseus
(b) Rauwolfia serpentina
(c) Hemidesmus indicus
(d) Aloe vera
Answer: (b) Rauwolfia serpentina
In simple words: Reserpine comes from the plant called Rauwolfia serpentina. This plant is used for making this medicine.

🎯 Exam Tip: Always associate specific drugs like Reserpine with their original plant source (Rauwolfia serpentina) when discussing medicinal plants.

 

Question 9. Casing is done on the mushroom to
(a) support the growth of mushroom
(b) provide humidity to mushroom
(c) regulate the temperature
(d) All of the options
Answer: (d) All of the options
In simple words: Casing helps mushrooms grow, gives them enough moisture, and controls their temperature. It helps in all these ways.

🎯 Exam Tip: When detailing mushroom cultivation steps, ensure you list all the important functions of casing, not just one, as it's a multi-purpose layer.

 

Question 10. The growth medium of Aeroponics is
(a) Nutrients
(b) Water
(c) air
(d) soil
Answer: (c) air
In simple words: Aeroponics grows plants with their roots hanging in the air. They get food from a fine mist sprayed on them.

🎯 Exam Tip: Distinguish Aeroponics (air-based, mist-fed) from Hydroponics (water-based) when describing soilless cultivation methods.

 

Question 11. The Indigenous Draught breed from Thanjavur district is
(a) Pulikulam
(b) Bargur
(c) Ongole
(d) Umblachery
Answer: (d) Umblachery
In simple words: The Umblachery cow is a local breed from the Thanjavur area, known for helping with farm work.

🎯 Exam Tip: For indigenous breeds, remember their region of origin and primary utility, such as draught (farm work) or dairy (milk production).

 

Question 12. are low in fibre and contain a high level of carbohydrates, protein, and other nutrients.
(a) Silage
(b) Concentrates
(c) Roughage
(d) None of the options
Answer: (b) Concentrates
In simple words: Concentrates are special animal foods that have lots of energy and protein but not much fiber. They help animals grow strong.

🎯 Exam Tip: Distinguish concentrates (high energy, low fiber) from roughage (high fiber, low energy) in animal nutrition questions.

 

Question 13. Operation Flood is the programme for development.
(a) Dairy
(b) Cattle
(c) Marine
(d) Agriculture
Answer: (a) Dairy
In simple words: Operation Flood was a program specifically created to help the dairy industry grow. It made India a major milk producer.

🎯 Exam Tip: Recognize Operation Flood as a key initiative related to dairy development and the "White Revolution" in India.

 

Question 14. Air-breathing fishes are cultured in water.
(a) Brackish
(b) Fresh
(c) Marine
(d) All of the options
Answer: (b) Fresh
In simple words: Fish that can breathe air are usually grown in fresh water. They don't need highly oxygenated water like other fish.

🎯 Exam Tip: The ability of some fish to breathe air makes them resilient and suitable for aquaculture in freshwater environments, even with lower oxygen content.

 

Question 15. Central Marine Fisheries Research Institute (CMFRI) is situated at
(a) Chennai
(b) Mumbai
(c) Cochin
(d) Vizag
Answer: (c) Cochin
In simple words: The main research center for marine fish, CMFRI, is located in Cochin. It studies ocean fish and how to catch them sustainably.

🎯 Exam Tip: For questions about national research institutes, remember the full name (CMFRI) and its location (Cochin) as key facts.

 

Question 16. Culture of fishes along with Agricultural crops is known as
(a) Polyculture
(b) Extensive culture
(c) Integrated culture
(d) Intensive culture
Answer: (c) Integrated culture
In simple words: When you farm fish and grow plants at the same time, it is called integrated culture. This way, everything helps each other.

🎯 Exam Tip: Integrated culture is a sustainable farming practice where different components, like fish and crops, benefit each other through nutrient recycling.

 

Question 17. The longest marine water prawn is
(a) Penaeus Indicus
(b) Penaeus monodon
(c) Macro brachium rosenbergii
(d) Macro brachium malcoumsonii
Answer: (b) Penaeus monodon
In simple words: The Penaeus monodon, also called the giant tiger prawn, is the longest type of prawn found in saltwater.

🎯 Exam Tip: When identifying specific species, remember the scientific names. Penaeus monodon is significant for its size among marine prawns.

 

Question 18. Earthworms are sacred – This statement was made by
(a) Aristotle
(b) Darwin
(c) Plato
(d) Cleopatra
Answer: (d) Cleopatra
In simple words: Cleopatra said that earthworms are sacred. People from ancient Egypt believed earthworms were very important for good soil.

🎯 Exam Tip: This is a historical fact connecting an important figure (Cleopatra) to the ancient recognition of earthworms' ecological importance.

 

Question 19. Vermicompost is similar to in colour and appearance.
(a) sheep manure
(b) Farmyard manure
(c) Green manure
(d) All of the options
Answer: (b) Farmyard manure
In simple words: Vermicompost looks and feels like farmyard manure. Both are dark, rich materials that make soil better.

🎯 Exam Tip: Compare vermicompost to farmyard manure based on its physical attributes (color and appearance), recognizing their shared role as organic fertilizers.

 

Question 20. is an enzyme present in Honey
(a) Sucrose
(b) Dextrose
(c) Invertase
(d) Maltase
Answer: (c) Invertase
In simple words: Honey contains an enzyme called invertase. This enzyme helps make the sugar in honey.

🎯 Exam Tip: Remember specific enzymes and their substrates; invertase in honey plays a crucial role in breaking down sucrose into simpler sugars.

 

Question 21. Fastest growing sector in Agriculture is
(a) Vegetable forcing
(b) Hydroponics
(c) Greenhouse
(d) Aqua ponies
Answer: (c) Greenhouse
In simple words: Growing plants in greenhouses is a very fast-growing part of farming. Greenhouses help farmers grow more food.

🎯 Exam Tip: Greenhouses are pivotal for controlled environment agriculture, leading to efficient resource use and high-yield production, a key aspect of modern farming.

 

Question 22. Which of the following are Indian cattle?
(i) Bos indicus
(ii) Bos domesticus
(iii) Bos bubalis
(iv) Bos vulgaris
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (iii) and (iv)
Answer: (b) (i) and (iii)
In simple words: Bos indicus (like Zebu cows) and Bos bubalis (water buffalo) are common types of cattle found in India. They are important for milk and farm work.

🎯 Exam Tip: Remember the scientific names for common Indian cattle breeds, Bos indicus (for humped cattle) and Bos bubalis (for water buffalo), distinguishing them from European breeds.

 

Question 23. Which one of the following is referred as red worms?
(a) Eudrilus fetida
(b) Eudrilus eugieniae
(c) Eisenia fetida
(d) Lampito mauritii
Answer: (c) Eisenia fetida
In simple words: Eisenia fetida is the scientific name for red worms. These worms are often used to make compost.

🎯 Exam Tip: Eisenia fetida is the key species for vermicomposting, widely recognized by its common name "red worm" or "red wiggler."

 

Question 24. Mehsana is a breed of
(a) Cow
(b) Buffalo
(c) Goat
(d) Sheep
Answer: (b) Buffalo
In simple words: Mehsana is a type of buffalo. It is a well-known breed that gives good milk.

🎯 Exam Tip: When learning about animal breeds, remember to associate them with the correct species (e.g., Mehsana with buffalo) and their primary use (e.g., dairy).

 

Question 25. Binomial name of Nilavemubu is
(a) Leucas Aspera
(b) Andrographis paniculata
(c) Crotalaria juncea
(d) Cassia fistula
Answer: (b) Andrographis paniculata
In simple words: The scientific name for Nilavembu is Andrographis paniculata. This plant is very important in traditional medicine.

🎯 Exam Tip: For medicinal plants, knowing their binomial scientific name, like Andrographis paniculata for Nilavembu, is crucial for precise identification.

II. Fill In The Blanks:

 

Question 1. Vegetable forcing is the most intensive type of vegetable growing.
Answer: Vegetable forcing
In simple words: Vegetable forcing means growing vegetables very fast, often not in their usual season.

🎯 Exam Tip: Vegetable forcing focuses on accelerating growth for year-round production, often through controlled environments.

 

Question 2. India stands first in the world in the production of Potato and Lady's finger.
Answer: Potato, Lady's finger
In simple words: India grows the most potatoes and lady's finger in the world.

🎯 Exam Tip: Remembering specific agricultural statistics, like India's top position in certain vegetable productions, highlights its global economic role.

 

Question 3. Compost is a soil conditioner as well as a fertilizer, which is rich in nutrients.
Answer: Soil conditioner
In simple words: Compost makes the soil better and gives food to plants. It is rich in good things for the soil.

🎯 Exam Tip: Recognize compost's dual role: improving soil's physical properties (conditioner) and providing plant nutrients (fertilizer).

 

Question 4. Earthworms eat biomass and excrete it in a digested form.
Answer: biomass
In simple words: Earthworms eat plant material and then leave behind a special soil that helps plants grow.

🎯 Exam Tip: Earthworms are natural recyclers; they consume organic waste (biomass) and produce nutrient-rich castings that improve soil structure and fertility.

 

Question 5. Green manure is obtained from undecomposed green material derived from Leguminous plants.
Answer: Leguminous
In simple words: Green manure is made from fresh plant matter, mostly from leguminous plants. These plants add good things to the soil.

🎯 Exam Tip: Leguminous plants are key to green manuring due to their ability to fix atmospheric nitrogen, naturally enriching the soil.

 

Question 6. Azotobacter is a type of Bio-fertilizers that are capable of producing antifungal and antibacterial compounds.
Answer: Azotobacter
In simple words: Azotobacter is a kind of natural fertilizer that makes things to fight off bad fungi and bacteria.

🎯 Exam Tip: Bio-fertilizers like Azotobacter offer multiple benefits: nutrient provision (nitrogen fixation) and plant protection through antimicrobial compounds.

 

Question 7. Mycorrhizae increase the uptake of Phosphorous.
Answer: Phosphorous
In simple words: Mycorrhizae help plants soak up more phosphorous from the soil. This nutrient is very important for plants to grow.

🎯 Exam Tip: Understand that mycorrhizal fungi extend the root system's reach, making essential but immobile nutrients like phosphorus more accessible to plants.

 

Question 8. Phytochemistry is the study of chemical substances derived from plants.
Answer: Phytochemistry
In simple words: Phytochemistry is the study of all the different chemicals that come from plants.

🎯 Exam Tip: Define phytochemistry by focusing on its core – the study of plant-derived chemicals – which often have medicinal or industrial applications.

 

Question 9. Chivan Amalpodi (Sarpagandha) is used as an antidote for snake bite.
Answer: Chivan Amalpodi (Sarpagandha)
In simple words: Chivan Amalpodi, also called Sarpagandha, is a traditional medicine used to treat snake bites.

🎯 Exam Tip: Note specific traditional remedies and their uses; Chivan Amalpodi is a notable example for snake bite treatment.

 

Question 10. Alkaloids, Terpenoids, flavonoids etc are called Secondary metabolites.
Answer: Secondary
In simple words: Alkaloids and similar substances are called secondary metabolites. Plants make them for special purposes, not just for growing.

🎯 Exam Tip: Differentiate between primary metabolites (essential for growth) and secondary metabolites (for defense, signaling, etc., often with medicinal value).

 

Question 11. India's first anti-diabetic ayurvedic drug is BGR-34.
Answer: BGR-34
In simple words: BGR-34 is the first Ayurvedic medicine made in India to help people with diabetes.

🎯 Exam Tip: Recognize BGR-34 as a significant advancement in indigenous medicine, specifically for diabetes management.

 

Question 12. Mushroom is a fungi belonging to Basidiomycetes.
Answer: Basidiomycetes
In simple words: Mushrooms are a kind of fungus that belongs to the Basidiomycetes family.

🎯 Exam Tip: Classify mushrooms correctly as fungi and remember their specific phylum, Basidiomycetes, known for edible varieties.

 

Question 13. Hydroponics was first demonstrated by German botanist Julius Von Sachs.
Answer: Julius Von Sachs
In simple words: A German plant scientist named Julius Von Sachs first showed how to grow plants using hydroponics, which means growing them without soil.

🎯 Exam Tip: Attribute the scientific pioneering of hydroponics to Julius Von Sachs, recognizing his contribution to plant physiology and soilless culture.

 

Question 14. Milk production in cattle depends upon the duration of Lactation.
Answer: Lactation
In simple words: How much milk a cow gives depends on how long it produces milk after having a baby. This time is called lactation.

🎯 Exam Tip: Lactation period is a critical factor in dairy farming; a longer lactation period generally means higher milk production and profitability.

 

Question 15. Jallikattu madu belongs to Indigenous Draught breed.
Answer: Indigenous Draught
In simple words: The Jallikattu madu cattle are strong, local breeds used for pulling things or in sports, not mainly for milk.

🎯 Exam Tip: Connect Jallikattu cattle to indigenous draught breeds, understanding their historical role in cultural events and their suitability for heavy work.

 

Question 16. Young female calf is called as Heifer.
Answer: Heifer
In simple words: A young female cow that has not yet had a baby is called a heifer.

🎯 Exam Tip: Learn the specific terminology for different age and sex classes of livestock; "heifer" is a standard term in dairy and cattle farming.

 

Question 17. Dr.Verghese Kurien is the Father of White revolution.
Answer: White revolution
In simple words: Dr. Verghese Kurien is famous for starting the White Revolution in India, which made India a leader in milk production.

🎯 Exam Tip: Associate Dr. Verghese Kurien with the "White Revolution" and Operation Flood, recognizing his impact on India's dairy sector.

 

Question 18. Panchagavya is an organic liquid Fertilizer.
Answer: organic liquid
In simple words: Panchagavya is a natural liquid fertilizer. It is made from cow products and helps plants grow well.

🎯 Exam Tip: Understand Panchagavya as a traditional organic fertilizer, emphasizing its natural origin and liquid form for soil enrichment.

 

Question 19. The Central Institute of Brackish Water Aquaculture (CIBA) was established in 1987.
Answer: 1987
In simple words: CIBA, a research center for brackish water farming, was started in the year 1987.

🎯 Exam Tip: For institutes, remember their full name (CIBA), focus area (brackish water aquaculture), and establishment year as key information.

 

Question 20. India holds 10th position in Marine fish production in the world.
Answer: 10th
In simple words: India is ranked 10th in the world for how much fish it catches from the sea.

🎯 Exam Tip: Knowing India's global position in marine fish production reflects its economic activity and reliance on marine resources.

 

Question 21. The eggs released by the female fish are fertilized by the sperm and fertilized eggs float in water as frothy mass.
Answer: frothy mass
In simple words: When fish eggs are fertilized, they often float on the water surface in a bubbly or frothy cluster.

🎯 Exam Tip: In fish breeding, the appearance of a frothy mass of eggs indicates successful fertilization and a particular spawning behavior.

 

Question 22. Hatching period in Hatchling pits is 2-7 days.
Answer: 2-7 days
In simple words: In hatchling pits, fish eggs usually hatch into baby fish within 2 to 7 days.

🎯 Exam Tip: Knowing the hatching period in aquaculture is essential for managing fish farming cycles and ensuring optimal conditions for young fish development.

 

Question 23. PUFA stands for Poly Unsaturated Fatty Acid.
Answer: Poly Unsaturated Fatty Acid
In simple words: PUFA is short for Poly Unsaturated Fatty Acid, which are healthy fats important for our bodies.

🎯 Exam Tip: PUFAs are important in nutrition and biology; remember their full form and association with healthy fats found in various food sources.

 

Question 24. Pokkali culture is the oldest and traditional method of prawn culture practiced in Kerala.
Answer: Pokkali
In simple words: Pokkali culture is an old way of farming prawns in Kerala. It combines growing rice with growing prawns.

🎯 Exam Tip: Pokkali culture is a unique example of integrated farming in Kerala, combining traditional rice and prawn cultivation in a saline environment.

 

Question 25. The nutrient rich materials that are excreted by earthworms knows as worm castings.
Answer: worm castings
In simple words: The rich soil that earthworms leave behind after they eat is called worm castings. This makes plants grow very well.

🎯 Exam Tip: Worm castings are a key product of vermicomposting; emphasize their high nutrient content and beneficial impact on soil fertility.

 

Question 26. The Storage cells contain honey and pollen.
Answer: Storage
In simple words: Beehives have special cells that hold honey and pollen. These are called storage cells.

🎯 Exam Tip: Distinguish storage cells from brood cells in a beehive by their function: storage for food, brood for raising young bees.

 

Question 27. Dextrose and Sucrose give sweet taste to the honey.
Answer: Dextrose, Sucrose
In simple words: Dextrose and sucrose are the sugars that make honey taste sweet.

🎯 Exam Tip: Honey's sweetness comes mainly from its sugar content; remember dextrose (glucose) and sucrose as key contributors.

 

Question 28. One kilogram of honey contains 3200 calories.
Answer: 3200
In simple words: One kilogram of honey has about 3200 calories, giving a lot of energy.

🎯 Exam Tip: Remember honey's high caloric value (approx. 3200 calories per kg) as it's a concentrated energy source.

 

Question 29. Bee wax is widely used in cosmetic and pharmaceutical industries.
Answer: Bee wax
In simple words: Bee wax is used a lot to make beauty products and medicines. It's good for creams and other helpful items.

🎯 Exam Tip: Bee wax is a versatile natural product; highlight its broad applications in cosmetics and pharmaceuticals due to its emollient and protective qualities.

 

III. Match the following:

Answer: 1-e, 2-d, 3-a, 4-c, 5-b
This means: Homeopathy with Samuel Hahnemann, Siddha with Agasthya, Unani with Hippocrates, Ayurveda with Charaka Samhita, and Yoga with Patanjali. These pairings connect each medical system or practice with its founder or a significant figure.
In simple words: We connect each health practice with the person who is linked to it. For example, Homeopathy is linked to Samuel Hahnemann, and Yoga to Patanjali.

🎯 Exam Tip: Remember these connections between traditional medicine systems and their key founders or proponents. This often tests historical knowledge in biology.

 

II. Match the following:

Answer: 1-d, 2-e, 3-b, 4-c, 5-a
This means: Rhizobium with leguminous plants, Azolla with floating nitrogen factory, Azotobacter with antifungal and antibacterial compounds, Mycorrhizae with vascular plants, and Azospirillum with crop plants. These connections highlight the symbiotic relationships and functions of various biofertilizers or microorganisms.
In simple words: This match tells us how different soil helpers work. For example, Rhizobium helps plants like beans, and Azolla acts like a floating nitrogen maker.

🎯 Exam Tip: Focus on understanding the specific roles of each biofertilizer or microorganism, especially their association with different plant types or their unique functions like nitrogen fixation or protective properties.

 

III. Match the following:

Answer: 1-a, 2-d, 3-c, 4-b
This means: Paddy straw Mushroom with Volvariella volvacea, Lingzhi Mushroom with Ganoderma lucidum, Oyster Mushroom with Pleurotussps, and Button Mushroom with Agaricus bisporus. These are the scientific names for different types of edible mushrooms, used in various culinary and medicinal contexts.
In simple words: This shows us the proper scientific names for common mushrooms. For example, a Button mushroom is called Agaricus bisporus.

🎯 Exam Tip: When matching common names to scientific names, pay close attention to genus and species. Knowing the classification helps in understanding diversity.

 

IV. Match the following:

Answer: 1-c, 2-d, 3-b, 4-a
This means: Bargur with Indigenous Draft breeds, Tharparkar with Dual-purpose breeds, Murrah with Buffalo breeds, and Gir with Indigenous dairy breeds. These match various animal breeds with their primary classification or use.
In simple words: This helps us put different animal types into their correct groups. For instance, Murrah is a type of buffalo, and Gir is a local cow breed known for milk.

🎯 Exam Tip: Classifications like 'indigenous,' 'draft,' 'dairy,' and 'dual-purpose' are crucial when studying animal husbandry. Know which breeds fall into each category.

 

IV. Say True or False. If False, Correct the Statement:

Question 1. Edible mushrooms are valuable source of supplementary lipids.
Answer: False.
Correct statement: Edible mushrooms are a valuable source of supplementary proteins. They are also known for their rich fiber content and essential vitamins and minerals.
In simple words: This statement is false. Edible mushrooms are very good for getting extra protein, not mainly fats.

🎯 Exam Tip: Remember the primary nutritional benefits of different foods. Edible mushrooms are celebrated for protein, fiber, and micronutrients, rather than being a significant lipid source.

 

Question 2. The yield of greenhouse is very high compared to outdoor cultivation.
Answer: True.
Greenhouses offer controlled environments that protect plants from harsh weather and pests, leading to higher productivity. This also allows for year-round cultivation, further increasing total yield.
In simple words: This is true. Growing plants in a greenhouse usually gives a lot more produce than growing them outside in a field.

🎯 Exam Tip: Understand the advantages of controlled environment agriculture, such as greenhouses. Key benefits include higher yields due to optimized conditions and protection from external factors.

 

Question 3. Rhizobium fix atmospheric nitrogen and convert them to nitrates.
Answer: False.
Correct statement: Rhizobium bacteria fix atmospheric nitrogen and convert it into ammonia. This process is called nitrogen fixation, which is crucial for plant growth.
In simple words: This is false. Rhizobium changes nitrogen from the air into ammonia, not nitrates.

🎯 Exam Tip: Differentiate between the products of nitrogen fixation. Rhizobium converts nitrogen gas into ammonia, which plants can then use to make proteins.

 

Question 4. The roots in hydroponic plant absorb water and nutrients but do not perform the anchoring function.
Answer: True.
In hydroponics, plants grow without soil, so their roots are mainly for absorbing water and dissolved nutrients. While they don't anchor the plant in soil, they can still provide some structural support by holding onto the system's inert medium.
In simple words: This is true. In hydroponics, plant roots take in water and food but they don't hold the plant steady in the ground because there is no soil.

🎯 Exam Tip: Understand the specialized function of roots in hydroponics. They prioritize nutrient and water absorption, as mechanical anchoring is less critical without a soil medium.

 

Question 5. Spawn is prepared by growing fungal mycelium in grains under fertile conditions.
Answer: False.
Correct statement: Spawn is prepared by growing fungal mycelium in grains under sterile conditions. Sterility prevents contamination from other fungi or bacteria, which is vital for successful mushroom cultivation.
In simple words: This is false. Spawn is made by growing mushroom roots (mycelium) on grains in a very clean, germ-free environment.

🎯 Exam Tip: Sterilization is critical in mushroom cultivation. Emphasize "sterile conditions" when explaining spawn preparation to ensure no unwanted growth interferes.

 

Question 6. Local breed animals show excellent resistance to diseases.
Answer: True.
Indigenous breeds have adapted over generations to local environmental conditions, including common pathogens, which often gives them a natural resistance to prevailing diseases. This resilience is a valuable trait for sustainable farming.
In simple words: This is true. Animals that grew up in the local area are often very good at fighting off sicknesses that are common there.

🎯 Exam Tip: Recognize the advantage of indigenous breeds in terms of disease resistance and adaptability to local climates, which is a key factor in their sustainability.

 

Question 7. Milk production of Buffaloes are less than that of cow.
Answer: False.
Correct statement: Milk production of Buffaloes are more than that of cows in certain regions, especially in India, where buffaloes are significant dairy animals. Buffalo milk often has higher fat and protein content.
In simple words: This is false. Buffaloes actually make more milk than many cows, especially in countries like India.

🎯 Exam Tip: Be aware of regional differences in dairy farming. While cows are globally popular, buffaloes are major milk producers in many parts of Asia, often yielding milk with higher fat content.

 

Question 8. The salinity of brackish water ranges from 30-35 ppt.
Answer: False.
Correct statement: The salinity of brackish water ranges from 1-32 ppt (parts per thousand). Brackish water is a mix of fresh and saltwater, so its salinity is between that of freshwater (below 1 ppt) and seawater (around 35 ppt).
In simple words: This is false. Brackish water has salt levels from 1 to 32 parts per thousand, which is less salty than the ocean.

🎯 Exam Tip: Clearly distinguish between the salinity ranges of freshwater, brackish water, and marine water. Brackish water represents a transition zone, vital for specific aquatic ecosystems.

 

Question 9. Fish meal is used as a feed for cattle and poultry farming animals.
Answer: True.
Fish meal is a protein-rich feed ingredient derived from fish and is commonly used in animal agriculture to enhance the nutritional value of feed for livestock and poultry. Its high protein content makes it very beneficial for growth and development.
In simple words: This is true. Fish meal is a good food source for farm animals like cows and chickens.

🎯 Exam Tip: Understand the role of high-protein supplements like fish meal in animal nutrition. It's a common ingredient in feeds to promote healthy growth in farm animals.

 

Question 10. Earthworm feeds on inorganic wastes and excrete it in digested form known as castings.
Answer: False.
Correct statement: Earthworms feed on organic wastes and excrete them in a digested form known as castings. These castings are rich in nutrients and improve soil quality, which is why they are so valuable in vermicomposting.
In simple words: This is false. Earthworms eat natural, organic waste, not inorganic waste, and turn it into rich soil called castings.

🎯 Exam Tip: Remember that earthworms are decomposers; they process organic matter. Their castings are beneficial for soil because they convert waste into nutrient-rich humus.

 

Question 11. Medicinal plants contain compounds that can be used for therapeutic purposes.
Answer: True.
Medicinal plants synthesize various bioactive compounds, such as alkaloids, flavonoids, and terpenes, which possess pharmacological properties and are used to treat diseases. These compounds are the basis of many traditional and modern medicines.
In simple words: This is true. Plants used in medicine have special chemicals that can help heal sicknesses.

🎯 Exam Tip: Focus on the concept of secondary metabolites in plants. These compounds are often responsible for the medicinal properties of plants, serving various therapeutic uses.

 

Question 12. Anthraquinones is obtained from Ocimum sanctum.
Answer: False.
Correct statement: Anthraquinones are typically obtained from plants like Aloe vera, not Ocimum sanctum (Tulsi). Ocimum sanctum is known for compounds like eugenol, while Aloe vera is a common source of anthraquinones, which are used for their laxative properties.
In simple words: This is false. Anthraquinones come from plants like Aloe vera, not from Tulsi.

🎯 Exam Tip: It's important to associate specific medicinal compounds with their correct plant sources. Knowing key plant-compound relationships helps avoid common misconceptions.

 

Question 13. Aquaponics is a technique of growing plants with their root supplied with moisture present in the air.
Answer: False.
Correct statement: Aeroponics is a technique of growing plants with their roots supplied with moisture present in the air. Aquaponics, on the other hand, combines aquaculture (raising fish) with hydroponics (growing plants in water).
In simple words: This is false. Growing plants with air moisture is called aeroponics. Aquaponics is about growing plants with fish in water.

🎯 Exam Tip: Clearly differentiate between hydroponics, aeroponics, and aquaponics. Each method has unique characteristics, especially regarding how water and nutrients are delivered to plant roots.

 

V. Assertion and Reason:

Direction: In each of the following questions, a statement of Assertion is given and a corresponding statement of Reason is given just below it. Of statements, given below, mark the correct answer as
a. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
b. If both Assertion and Reason are true that Reason is not the correct explanation of Assertion.
c. If Assertion is true but Reason is false.
d. If Assertion is false but Reason is true.

Question 1. Assertion: Apiculture, vermiculture are gaining more importance. Reason: They have economical and commercial values.
Answer: (a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
In simple words: Both parts are true, and the reason explains why beekeeping and earthworm farming are becoming more popular. They are important because they bring money and have business benefits.

🎯 Exam Tip: For assertion-reason questions, first check if both statements are individually true. Then, determine if the reason directly explains the assertion. Look for a cause-and-effect relationship.

 

Question 2. Assertion: Foreign dairy breeds are preferred over local breeds. Reason: The foreign breeds have shorter lactation periods.
Answer: (c) Assertion is true but Reason is false
In simple words: It is true that people often like foreign dairy cow breeds more. But the reason given is wrong, because foreign breeds actually have longer periods of milk production, not shorter ones.

🎯 Exam Tip: Be precise with the characteristics of different breeds. Exotic dairy breeds are preferred for higher milk yield and longer lactation periods, making the given reason incorrect.

 

Question 3. Assertion: Bullocks are good draft animals in draft breeds. Reason: Cows are poor milk yielders in draft (or) Draught breeds.
Answer: (a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
In simple words: Both statements are true and linked. Bullocks from draft breeds are strong for farm work. This is because cows of these breeds are not very good at giving milk, so the focus is on their strength for labor.

🎯 Exam Tip: Understand the specialized roles of different cattle breeds. Draft breeds are selected for their strength and suitability for work, often at the expense of milk production in females.

 

Question 4. Assertion: Porous soil permits both aeration and quick absorption of water. Reason: The burrowing and soil feeding habits of earthworm make the soil porous.
Answer: (a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
In simple words: Both statements are correct, and the second one explains the first. Soil that has many holes lets air and water pass through easily. Earthworms help make these holes when they dig and eat through the soil.

🎯 Exam Tip: Recognize the vital role of earthworms in improving soil structure. Their actions directly lead to increased porosity, which enhances aeration and water absorption, benefiting plant growth.

 

Question 5. Assertion: Hydroponics can be defined as a soilless growing system in which plants grow in water. Reason: If a plant is provided with water, minerals and required nutrients, it will grow well and yield more even in the absence of soil.
Answer: (a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
In simple words: Both statements are true, and the reason clearly explains the assertion. Hydroponics means growing plants in water without soil. This works because plants only need water, minerals, and nutrients to grow well, which can all be given to them without soil.

🎯 Exam Tip: The core principle of hydroponics is nutrient delivery. If all necessary elements are provided, soil becomes a supporting medium, not an essential nutrient source itself.

 

Question 6. Assertion: Fish and other varieties of aquatic animals are used as food. Reason: Fish and other varieties of sea food constitute good source of nutrition.
Answer: (a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
In simple words: Both statements are true, and the reason tells us why. Fish and other water animals are eaten as food because they are very good sources of important nutrients for our body.

🎯 Exam Tip: Connect food sources with their nutritional value. Seafood is recognized for being rich in proteins, healthy fats, vitamins, and minerals, making it a valuable part of the diet.

 

Question 7. Assertion: The production of food from animal sources has increased greatly in the last few decades. Reason: Operation flood and blue revolution production has increased in recent years.
Answer: (b) Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
In simple words: Both parts are true: more animal food is being made, and programs like Operation Flood (for milk) and Blue Revolution (for fish) have boosted production. However, the reason doesn't explain the *entire* increase in animal food production, but only specific parts.

🎯 Exam Tip: Be careful when evaluating if a reason fully explains an assertion. While the Blue Revolution and Operation Flood contribute to increased animal food production, they are not the sole or exhaustive reasons for the overall global increase.

 

VI. Define the Following:

Question a. Pisciculture
Answer: Pisciculture, also known as fish culture, is the process of breeding and rearing fish in controlled environments such as ponds, reservoirs (dams), lakes, rivers, and paddy fields. This practice helps in providing food and economic benefits.
In simple words: Pisciculture means growing and raising fish in places like ponds or rivers.

🎯 Exam Tip: Define key terms clearly. Pisciculture specifically refers to fish farming, emphasizing controlled breeding and rearing for food or other products.

 

Question b. Apiculture
Answer: Apiculture is the practice of rearing honey bees, usually for their honey and other products like beeswax, propolis, and royal jelly. This is also called beekeeping and plays an important role in pollination.
In simple words: Apiculture is when people raise honey bees to get honey and other bee products. It's also known as beekeeping.

🎯 Exam Tip: When defining apiculture, mention both the rearing of bees and the main products obtained (honey, beeswax). The term "beekeeping" is a useful synonym to include.

 

Question c. Vermiculture
Answer: Vermiculture involves the artificial rearing or cultivation of earthworms to produce vermicompost, a nutrient-rich organic fertilizer, from natural organic wastes. Earthworms break down waste, improving soil quality.
In simple words: Vermiculture is farming earthworms to make compost from trash, which helps plants grow.

🎯 Exam Tip: For vermiculture, emphasize the role of earthworms in converting organic waste into vermicompost, highlighting its value as a natural fertilizer.

 

Question d. Mariculture (or) Marine water aquaculture
Answer: Mariculture, also known as marine water aquaculture, is the cultivation of aquatic organisms like fish, shellfish, and seaweeds in seawater environments, such as oceans, lagoons, or coastal ponds. This practice helps to meet the increasing demand for seafood and other marine products.
In simple words: Mariculture is farming sea animals and plants in ocean water, like growing fish or oysters in the sea.

🎯 Exam Tip: Specify "seawater" when defining mariculture to distinguish it from other forms of aquaculture. Include examples of organisms cultivated, like fish and shellfish.

 

Question e. Floriculture (or) Flower Farming
Answer: Floriculture is the art and science of cultivating flowering and ornamental plants in gardens or commercial settings, primarily for aesthetic appeal, floristry, or landscape design. This involves careful breeding and growth techniques to produce beautiful flowers.
In simple words: Floriculture is growing flowers and other pretty plants, either in gardens or for selling.

🎯 Exam Tip: When defining floriculture, highlight its focus on flowering and ornamental plants. Mention its primary purpose: beauty, decoration, and floristry.

 

Question f. Compost
Answer: Compost is a rich organic material produced from the decomposition of organic matter, such as plant remains and food scraps, through natural biological processes. It acts as a soil conditioner and a fertilizer, enriching the soil with nutrients.
In simple words: Compost is a type of rich soil made from old plant parts and food waste, which helps other plants grow better.

🎯 Exam Tip: Define compost as decomposed organic matter. Emphasize its dual role as a soil conditioner and a nutrient-rich fertilizer, improving soil health.

 

Question g. Pomiculture
Answer: Pomiculture is the branch of horticulture that focuses on the cultivation, development, and enhancement of fruit-bearing plants, specifically fruit trees. This field involves techniques to improve fruit quality and yield.
In simple words: Pomiculture is the study and practice of growing fruit trees and improving the fruits they produce.

🎯 Exam Tip: Clearly state that pomiculture deals with fruit cultivation, especially fruit trees. Connect it to horticulture as a specific sub-discipline.

 

Question h. Pinning
Answer: In mushroom cultivation, pinning refers to the stage where tiny white buds, called pins, start to develop from the mycelium. These pins are the initial forms that will eventually grow into mature mushrooms.
In simple words: Pinning is when small white dots, like tiny buds, start to appear on the mushroom roots (mycelium). These are the first signs of new mushrooms growing.

🎯 Exam Tip: Define pinning in the context of mushroom development. It's the critical first visible stage of mushroom formation from the mycelial network.

 

VII. Very Short Answer Questions:

Question 1. Name the main classes of Horticulture.
Answer: The four main classes of Horticulture are:
1. Pomology (fruit farming)
2. Olericulture (vegetable farming)
3. Floriculture (flowers farming)
4. Landscape gardening.
In simple words: Horticulture has four main parts: growing fruits, growing vegetables, growing flowers, and designing gardens.

🎯 Exam Tip: List all four classes accurately and briefly mention what each category entails (e.g., pomology for fruits). This shows a comprehensive understanding of horticulture's scope.

 

Question 2. What is Floriculture?
Answer: Floriculture is the art and science of cultivating flowering and ornamental plants in gardens or commercial nurseries, mainly for their beauty or for use in floristry (flower arrangements). It involves growing plants for decoration and display.
In simple words: Floriculture is growing flowers and other pretty plants for decoration or for selling in flower shops.

🎯 Exam Tip: A good definition of floriculture emphasizes both the cultivation aspect and the purpose (beauty, ornament, floristry). Avoid simply stating "flower farming" without further detail.

 

Question 3. What is spawning?
Answer: Spawning in mushroom cultivation refers to the process of sowing or planting mushroom spawn (which acts as the mushroom "seed" and consists of fungal mycelium grown on grains) onto a prepared compost or substrate under sterile conditions. This initiates the growth of mushrooms.
In simple words: Spawning is like planting the "seeds" of mushrooms. We spread the mushroom roots (mycelium) that have grown on grains onto a special bed, so new mushrooms can start to grow.

🎯 Exam Tip: Clearly define spawn as the "seed" (mycelium on grains) and spawning as the act of planting it. Emphasize the importance of sterile conditions for successful mushroom growth.

 

Question 4. What is Vermicompost?
Answer: Vermicompost is a rich organic fertilizer and soil conditioner produced by earthworms through the process of vermicomposting. It is made from digested organic wastes and improves soil structure, aeration, and nutrient availability.
In simple words: Vermicompost is a special, very rich soil that earthworms make by eating waste. It's great for helping plants grow.

🎯 Exam Tip: Define vermicompost as the product of earthworm activity on organic waste. Highlight its key benefits: improving soil and providing nutrients.

 

Question 5. List the leguminous plants providing green manure.
Answer: Leguminous plants commonly used for green manure include:
• Sunhemp (Crotalaria juncea)
• Dhaincha (Sesbania aculeata)
• Sesbania (Sesbania speciosa)
These plants are excellent for enriching soil because they can fix atmospheric nitrogen.
In simple words: Some bean-family plants used to make green manure are Sunhemp, Dhaincha, and Sesbania.

🎯 Exam Tip: When listing examples, ensure they are accurate. Briefly explain *why* leguminous plants are good for green manure (nitrogen fixation) to show deeper understanding.

 

Question 6. Define: phytochemistry.
Answer: Phytochemistry is the scientific study of phytochemicals, which are the chemical substances produced by plants. This field explores the structure, function, and biological effects of these compounds, often focusing on their medicinal properties.
In simple words: Phytochemistry is the study of all the different chemicals that plants make.

🎯 Exam Tip: Define phytochemistry as the study of plant chemicals. Emphasize that these phytochemicals are responsible for many plant characteristics, including medicinal uses.

 

Question 7. Name any three edible mushrooms.
Answer: Three edible mushrooms are:
1. Button mushroom (Agaricus bisporus)
2. Oyster mushroom (Pleurotus spp.)
3. Paddy straw mushroom (Volvariella volvacea)
These mushrooms are widely cultivated and consumed for their taste and nutritional value.
In simple words: Three mushrooms we can eat are Button mushrooms, Oyster mushrooms, and Paddy straw mushrooms.

🎯 Exam Tip: Provide both the common and scientific names for edible mushrooms if possible, as it demonstrates a more complete knowledge. Ensure you list distinct types.

 

Question 8. Mention the main problems of harvesting mushrooms.
Answer: The main problems during mushroom harvesting include:
1. Discoloration: Mushrooms can change color, affecting their market appeal.
2. Weight and flavor loss: Improper handling can lead to a reduction in both weight and the desired taste. Careful harvesting ensures product quality.
In simple words: When picking mushrooms, main problems are that they might change color or lose some of their weight and good taste.

🎯 Exam Tip: Focus on practical post-harvest issues for mushrooms. Discoloration and quality loss are common concerns that impact marketability and consumer satisfaction.

 

Question 9. Name any three methods to increase mushroom life.
Answer: Three methods to increase mushroom shelf life are:
1. Freezing: Storing mushrooms at very low temperatures to halt spoilage.
2. Vacuum Cooling: Rapidly removing heat and oxygen to preserve freshness.
3. Gamma radiation and storing at 15°C: Using radiation to extend shelf life, combined with cool storage. These methods slow down decay and microbial growth.
In simple words: To keep mushrooms fresh longer, you can freeze them, cool them quickly with vacuum, or use gamma radiation and keep them at 15°C.

🎯 Exam Tip: When discussing preservation, list methods that address different aspects of spoilage (temperature, microbial growth, metabolic activity). Each method plays a specific role.

 

Question 10. Write classification of cattle breeds.
Answer: Cattle breeds are generally classified into three main types based on their primary use:
1. Dairy breeds (raised for milk production)
2. Drought (or) Draft breeds (raised for farm work)
3. Dual-purpose breeds (raised for both milk and work).
In simple words: Cattle breeds are grouped into three types: those for milk, those for farm work, and those for both milk and work.

🎯 Exam Tip: Remember the three primary classifications of cattle based on their utility. This fundamental categorization helps understand their roles in agriculture.

 

Question 11. How is the Fish Meal prepared?
Answer: Fish meal is prepared from the wastes of fish oil production or by processing whole fish that are not suitable for human consumption. The process involves cooking, pressing, drying, and grinding the fish material. It is a vital protein source in animal feed.
In simple words: Fish meal is made from leftover parts of fish or whole fish that people don't eat. These parts are cooked, pressed, dried, and ground into a powder.

🎯 Exam Tip: Explain the source of fish meal (fish waste, whole fish not for human consumption) and the general processing steps. Emphasize its high protein content.

 

Question 12. List the methods employed in Prawn Culture,
Answer: The main methods employed in Prawn Culture are:
1. Seed collection and hatchery method: This involves collecting prawn larvae (seeds) from natural sources or producing them in controlled hatchery environments.
2. Paddy cum prawn culture method: This is an integrated farming system where prawns are cultivated in rice fields after the rice harvest, utilizing the residual water and nutrients.
In simple words: Two ways to farm prawns are by collecting their young or growing them in special hatcheries, and also by raising them in rice fields after the rice has been picked.

🎯 Exam Tip: When listing aquaculture methods, try to give a brief explanation for each. The "paddy cum prawn" method is a notable example of integrated farming.

 

Question 13. What is Bee wax?
Answer: Beeswax is a natural by-product secreted by the wax glands located on the abdomen of worker bees. These bees use the wax to construct the hexagonal combs of a beehive, which are used for storing honey and raising young.
In simple words: Beeswax is a natural substance that worker bees make from their bodies. They use it to build the honeycombs in their hive.

🎯 Exam Tip: Define beeswax as a secretion from worker bees and explain its primary function: building the comb structures within the hive.

 

Question 14. Mention the aim of operation Flood.
Answer: The aim of Operation Flood, also known as the White Revolution, was to increase the milk supply in urban areas across India by establishing a nationwide milk grid. This program empowered dairy farmers and made India the world's largest milk producer.
In simple words: Operation Flood's goal was to make sure cities had enough milk and to help milk farmers.

🎯 Exam Tip: Identify Operation Flood with the "White Revolution" and remember its core objective: increasing milk production and distribution, especially in urban centers.

 

Question 15. What does NDDB stand for?
Answer: NDDB stands for National Dairy Development Board. It is an organization in India that was founded to develop and promote the dairy industry in the country.
In simple words: NDDB means National Dairy Development Board.

🎯 Exam Tip: For acronyms, always provide the full form accurately. Knowing the function (dairy development) adds context.

 

VIII. Short Answer Questions:

Question 1. How is compost prepared?
Answer: Compost is prepared through the decomposition of organic matter, such as crop residues, animal wastes, food wastes, and industrial or municipal wastes, by microorganisms under controlled conditions. This process results in a nutrient-rich soil amendment.
In simple words: Compost is made by letting natural things like plant leftovers and animal waste break down with the help of tiny living things, in a controlled way.

🎯 Exam Tip: Focus on the key elements of compost preparation: organic materials, decomposition by microorganisms, and controlled conditions. This highlights the biological nature of the process.

 

Question 2. Mention the advantages of Green Manure.
Answer: The advantages of Green Manure are:
• Green Manure improves the soil structure, making it more stable and workable.
• It increases the soil's water holding capacity and reduces soil loss due to erosion.
• It also helps in reclaiming alkaline soils and reduces the growth of unwanted weeds. Green manure adds organic matter and nutrients to the soil.
In simple words: Green manure makes soil better by improving its structure, helping it hold more water, stopping it from washing away, and reducing weeds.

🎯 Exam Tip: When listing advantages, categorize them (soil structure, water retention, erosion control, nutrient addition). This provides a comprehensive overview of its benefits.

 

Question 3. Write short notes on Mushrooms;
Answer: Short notes on Mushrooms:
• A mushroom is a type of fungus that belongs to the group called basidiomycetes.
• It is highly nutritious, rich in proteins, dietary fibers, vitamins, and essential minerals.
• The cultivation of mushrooms generally takes one to three months to complete. They play a significant role in ecosystems as decomposers.
In simple words: Mushrooms are fungi, full of protein and vitamins. They take about 1 to 3 months to grow.

🎯 Exam Tip: When writing short notes, include key biological classification (fungus, basidiomycetes), nutritional value, and cultivation duration for a complete answer.

 

Question 4. Explain briefly about Aquaponics.
Answer: Aquaponics is an innovative system that combines conventional aquaculture (raising aquatic animals like fish) with hydroponics (cultivating plants in water) in a symbiotic environment. The fish waste provides nutrients for the plants, and the plants filter the water for the fish.
• Its two main parts are: (i) Aquaculture – for raising aquatic animals like fish, and (ii) Hydroponics – for raising plants.
In simple words: Aquaponics is a way to grow plants and fish together. The fish provide food for the plants, and the plants clean the water for the fish.

🎯 Exam Tip: Emphasize the symbiotic relationship in aquaponics: fish waste feeds plants, and plants filter water for fish. Clearly state its two integrated components.

 

Question 5. Write short notes on Intensive Cattle Development Programme.
Answer: The Intensive Cattle Development Programme (ICDP) aims to boost milk production by promoting cross-breeding of indigenous cows with exotic European breeds. This program also provides new methods and modern equipment for machine milking of cows.
• Intensive Cattle Development Programme is based on cross-breeding of indigenous cows with exotic European breeds to increase milk production.
• New methods and modern equipment are made available for machine milking of cows. These initiatives significantly improve the efficiency and output of dairy farming.
In simple words: This program helps make more milk by mixing local cows with European cows, and it teaches farmers new ways to milk cows using machines.

🎯 Exam Tip: Key points for ICDP include cross-breeding for higher yields and the introduction of modern milking technology. Focus on these two pillars of the program.

 

Question 6. Differentiate Extensive and Intensive Fish culture.
Answer:

In simple words: Extensive fish culture uses big spaces and natural food, while intensive culture uses smaller spaces with more fish and special feed. Both methods aim to produce fish for people to eat.

🎯 Exam Tip: When differentiating, always use a table format and highlight specific contrasting points clearly for each item to score full marks.

 

Question 7. What is green manure? How is it beneficial?
Answer: Green manure is made by collecting and breaking down green leaves, small tree branches, shrubs, and other plant materials found in empty lands or near farm boundaries. It is a natural way to make soil healthier and more productive for crops. Green manure makes the soil structure better, helps it hold more water, and stops soil from washing away. It also helps to improve salty soils and reduce unwanted weeds. This manure is obtained from plants like Sunhemp and Dhaincha which are not fully decomposed.
In simple words: Green manure is plant material dug into the soil. It makes the soil better by adding nutrients, holding water, and stopping erosion, helping plants grow stronger.

🎯 Exam Tip: Remember to name specific examples of plants used for green manure, like Sunhemp or Dhaincha, as this shows a deeper understanding.

 

Question 8. Enumerate the nutritional values of prawns.
Answer: Prawns are a very good source of nutrition, offering many important substances. They are rich in protein, which is vital for building and repairing body tissues. Prawns also provide vitamins A and D, important for vision and bone health, as well as glycogen and essential amino acids. Importantly, prawns contain very little fat, making them a healthy food choice. Farmed prawns also provide Poly Unsaturated Fatty Acid (PUFA), which is good for heart health.
In simple words: Prawns are full of good things like protein, vitamins A and D, and healthy fats, but have little unhealthy fat. They are a nutritious food.

🎯 Exam Tip: Focus on specific nutrients (protein, vitamins A & D, PUFA) and their general benefits to show a comprehensive understanding of nutritional value.

 

Question 9. List the important methods of vermicomposting.
Answer: Vermicomposting is the process of using earthworms to turn organic waste into a rich soil amendment called vermicompost. There are several ways to do this:

• Bin or Container Method: This involves setting up small bins or containers, either indoors or outdoors, where earthworms are introduced to organic waste. This method is suitable for home use or small-scale composting.
• Vermicomposting of Organic Wastes in Field Pits: For larger amounts of waste, organic materials are placed in pits dug in the ground. Earthworms are added to these pits to break down the waste.
• Vermicomposting of Organic Wastes on Ground Heaps: Organic waste is arranged in heaps directly on the ground, and earthworms are introduced. This method is often used for composting larger volumes of agricultural waste.

These methods allow for efficient decomposition, producing valuable compost for plants.
In simple words: Vermicomposting uses earthworms to make compost. You can do this in special bins, in pits in the ground, or in piles on the ground, depending on how much waste you have.

🎯 Exam Tip: When listing methods, briefly explain each one to show you understand how it works, not just its name.

 

Question 10. What do you know about AYUSH?
Answer: AYUSH is a ministry within the Government of India that focuses on traditional and alternative medical systems. The name AYUSH is an acronym that stands for Ayurveda, Yoga, Unani, Siddha, and Homeopathy. These are all ancient and holistic practices of healing and wellness. This ministry works to promote and develop these traditional forms of medicine, recognizing their importance alongside modern treatments.
In simple words: AYUSH is an Indian government group for traditional medicines like Ayurveda and Yoga. It helps these old healing methods grow.

🎯 Exam Tip: Clearly state what the acronym AYUSH stands for and mention its role as a government ministry for traditional medicine.

 

Question 11. Why do we call Haryana and Kankrej breed of cattle as dual-purpose breeds?
Answer: The Haryana and Kankraj breeds of cattle are known as dual-purpose breeds because they are useful for two main things. Firstly, these breeds are good for producing milk, providing a source of dairy products. Secondly, they are also strong and efficient for farm work, such as plowing fields or pulling carts. Because they offer both milk and labor, they are highly valued by farmers and considered to have a dual purpose. Many traditional cattle breeds in India were developed for such dual benefits.
In simple words: Haryana and Kankraj cows are called dual-purpose because they give milk and also help with farm work. They serve two important needs for farmers.

🎯 Exam Tip: Define "dual-purpose" by clearly stating the two benefits (milk production and farm work) that these breeds provide.

 

Question 12. How is the division of labour observed in honey bees?
Answer: Honey bee colonies show a clear division of labor, where different types of bees have specific roles.

• Queen Bee: This is the largest bee in the colony and is fertile. Her main job is to lay all the eggs, ensuring the colony grows.
• Drones: These are fertile male bees, which develop from unfertilized eggs. They are responsible for fertilizing the eggs laid by the Queen Bee.
• Worker Bees: These are sterile female bees, the smallest in the colony. They perform various tasks essential for the colony's survival, such as collecting honey, caring for the young bees, cleaning the honeycomb, defending the hive, and maintaining the hive's temperature.

This teamwork allows the colony to function efficiently.
In simple words: In a beehive, each bee has a special job. The Queen lays eggs, Drones help fertilize them, and Worker bees do everything else like collecting food and cleaning.

🎯 Exam Tip: Remember the three main types of bees (Queen, Drone, Worker) and at least two key functions for each to demonstrate understanding of their roles.

 

Question 13. What is the nutritional importance of fish liver oils? Name any two marine fishes which yield these oils.
Answer: Fish liver oils are very important nutritionally because they are packed with health benefits. They are considered to have great medicinal value. These oils are especially rich in essential vitamins, particularly Vitamin A, Vitamin D, and Vitamin E, which are crucial for overall health, vision, and immunity. Shark and Tuna are two marine fish that provide these valuable liver oils. These oils are often extracted and used as dietary supplements.
In simple words: Fish liver oils are good for you because they have lots of vitamins A, D, and E, helping your body stay healthy. You can get these oils from fish like Shark and Tuna.

🎯 Exam Tip: When discussing nutritional importance, specify the key vitamins (A, D, E) present in fish liver oils, and provide two correct examples of fish sources.

 

IX. Long Answer Questions

 

Question 1. Compare types of Bio fertilisers with their functions.
Answer:

In simple words: Biofertilisers are tiny living things that help plants grow better. Each type, like Rhizobium or Azolla, has a special job, mostly helping plants get more nitrogen or phosphorus from the soil. They are a natural boost for crops.

🎯 Exam Tip: When comparing, make sure to clearly state both the type of biofertiliser and its primary function. Adding an example or specific benefit for each enhances your answer.

 

Question 2. What are the types of honey bees found in a colony?
Answer: A honey bee colony is like a well-organized society with three different types of bees, each having a specific role. These are the Queen bee, the Drones, and the Worker bees. The Queen bee is the largest member and the only fertile female, responsible for laying all the eggs. Drones are fertile males that develop from unfertilized eggs. Worker bees are the smallest members and are sterile females, carrying out almost all the tasks needed for the colony to survive and thrive, from collecting food to maintaining the hive. This division of labor makes the colony very efficient.
In simple words: A bee colony has three kinds of bees: the Queen (lays eggs), Drones (males for mating), and Workers (do all the other jobs like collecting honey and building the hive).

🎯 Exam Tip: Clearly identify the three types of bees and briefly mention their primary role to fully answer what types are found in a colony.

 

Question 3. Discuss various types of Honey bees with their functions.
Answer:

In simple words: A honey bee colony has a Queen (lays eggs, lives long), Drones (males, fertilize eggs, short life), and Workers (females, do all hive jobs, shortest life). Each bee type has a key role for the colony to thrive.

🎯 Exam Tip: A well-structured table is best for discussing different types and their functions. Include details like life span and how they are formed for a complete answer.

 

Question 4. Explain the structure of Honey Bee Comb.
Answer: The honey bee comb is a very special structure built by worker bees. It is mainly made from wax that the worker bees secrete from glands in their abdomen. The comb is a vertical sheet of wax that has two layers of hexagonal (six-sided) cells back-to-back. These hexagonal cells are efficient for storage and strength. The comb contains different types of cells:

• Storage Cells: These are found at the edges and top of the comb. They are used to store honey and pollen, which are food for the colony.
• Brood Cells: Located in the center and lower parts of the comb, these cells are where the young bees (larvae) grow. Brood cells are divided into smaller chambers for worker bees, drone bees, and queen bees, depending on which type of bee is being reared.

The organized structure of the comb allows the colony to store food efficiently and raise new bees.
In simple words: A honey bee comb is made of wax and has many six-sided cells. Some cells store honey and pollen, while others are used to grow baby bees.

🎯 Exam Tip: Describe the comb's material (wax), shape (hexagonal cells), and the two main types of cells (storage and brood), explaining what each is for.

 

Question 5. How is honey formed?
Answer: Honey is made by honey bees through a fascinating process. First, honey bees collect nectar, a sweet liquid, from various flowers using their long, tube-like tongues. When they suck up the nectar, it goes into a special stomach called the honey sac. Inside the honey sac, enzymes start to break down the nectar. Specifically, an enzyme called invertase changes the sucrose in the nectar into simpler sugars: fructose and glucose. After this change, the bees bring the modified nectar back to the hive and store it in the hexagonal cells of the comb. They then fan their wings to evaporate excess water, making the liquid thicker and turning it into honey. This concentrated honey is then sealed in the cells for later use.
In simple words: Bees collect sweet nectar from flowers. Inside their bodies, enzymes change the nectar into honey. They store this in the hive and fan it to make it thick.

🎯 Exam Tip: Explain the steps clearly: nectar collection, storage in the honey sac, enzymatic conversion of sucrose, water evaporation, and storage in the hive.

 

Question 6. Discuss the various nutrients present in Honey.
Answer: Honey is a thick, sweet, and edible natural food product packed with various nutrients. Its sweet taste comes mainly from dextrose (glucose) and sucrose. Honey is also a good source of protein, essential free amino acids, and several vitamins, including ascorbic acid (Vitamin C), though in smaller amounts. Various acids like citric acid, gluconic acid, and formic acid are found in honey, which contribute to its flavor and preservative qualities. It also contains important minerals such as calcium, iron, phosphorus, and manganese. Additionally, honey naturally contains the enzyme invertase, which helps in its formation. Honey is thus more than just a sweetener; it's a complex natural product with many beneficial compounds.
In simple words: Honey has sugar for sweetness, proteins, vitamins like C, and minerals such as calcium and iron. It also contains natural acids and an enzyme called invertase, making it a nutritious food.

🎯 Exam Tip: List the major nutrient categories (sugars, proteins, vitamins, minerals, acids, enzymes) and give at least one specific example for each to show a comprehensive understanding.

 

Question 7. Give an account on medicinal plants.
Answer: Medicinal plants are natural sources of various compounds used to treat illnesses and promote health.

1. Katralai (Aloe vera): This plant has fleshy herbal leaves. The drug derived from Aloe vera, anthraquinones, is an excellent treatment for skin problems, certain types of cancer, and helps wounds heal.
2. Tulsi (Ocimum sanctum): Also known as Holy Basil, Tulsi is a very important herb with medicinal properties found in its leaves. It is widely used as a best medicine for common cold and fever. It is also beneficial for cardiac diseases (heart conditions) and gynecological disorders.
3. Nilavembu (Andrographis paniculata): This herbal plant is valued for its medicinal properties found in its roots and leaves. It is considered a best tonic for dengue fever and is also used to treat diabetes and malaria. Nilavembu is also an effective remedy for ulcers, influenza, and Chikungunya.
4. Vepalai (Neem) - (Wrightia tinctoria): Every part of the Neem tree has medicinal value. It has antipyretic (fever-reducing), antibacterial, and antitumour properties. Neem also boosts immunity. It is used to treat urinary infections and skin diseases like Psoriasis. Additionally, it is good for respiratory disorders, diarrhea, and swellings.
5. Pappali (Carica papaya): Like neem, every part of the papaya plant offers medicinal benefits. It is an excellent medicine for dengue fever, helping to manage its symptoms. It also helps reduce the risk of heart diseases, diabetes, and cancer. Furthermore, papaya helps lower blood pressure and heals wounds.

These plants highlight the rich traditional knowledge of plant-based remedies.
In simple words: Many plants like Aloe vera, Tulsi, Nilavembu, Neem, and Papaya are used as medicines. They help treat many health problems like fevers, skin issues, diabetes, and dengue.

🎯 Exam Tip: For each medicinal plant, state its common name, scientific name (if given), the part used, and at least two key medicinal uses to provide a comprehensive answer.

 

Question 8. What are biofertilisers? Give examples. Why are biofertilisers better than other fertilisers?
Answer: Biofertilisers are substances that contain living microorganisms. When these are applied to plants or soil, they help promote plant growth by increasing the supply of primary nutrients to the host plant. They are a natural and effective way to enrich soil.
Examples of biofertilisers include:

1. Rhizobium
2. Azospirillum
3. Azotobacter
4. Mycorrhizae
5. Azolla

Advantages of Biofertilisers over chemical fertilisers:

• Biofertilisers are environmentally friendly because they do not cause pollution.
• They improve the quality of soil nutrients, making the soil richer.
• They help maintain the overall health of the soil over a long period.
• They enhance the soil's texture and structure, and its ability to hold water.
• Biofertilisers have no negative impact on plant growth or soil fertility; instead, they benefit both.

Chemical fertilisers can sometimes harm the environment and soil health, making biofertilisers a safer and more sustainable choice.
In simple words: Biofertilisers are tiny living things that help plants get more food from the soil, like Rhizobium. They are better than chemical fertilisers because they don't pollute, make the soil healthy, and help plants grow well naturally.

🎯 Exam Tip: Clearly define biofertilisers and list at least three examples. When comparing with chemical fertilisers, provide three distinct advantages of biofertilisers.

 

Question 9. Write short notes on
(a) Importance of greenhouses
(b) Uzhavan mobile Application
(c) Major floriculture zones
(d) Azospirillum
Answer:
(a) Importance of Greenhouses: Greenhouses are structures that allow for controlled plant growth environments. They enable the continuous production of disease-free plants by protecting them from pests and harsh weather. Greenhouses require very little water and pesticides, making them efficient. They also provide very high yields and offer protection from unpredictable weather conditions, ensuring a steady supply of crops. This helps grow plants more effectively.
(b) Uzhavan Mobile Application: The Uzhavan mobile application was launched by the Government of Tamil Nadu. It is a digital tool designed to help farmers. The app provides valuable information about government subsidies, crop insurance schemes, and the availability of seeds and fertilizers. This helps farmers make informed decisions and access necessary resources easily.
(c) Major Floriculture Zones: Floriculture is the cultivation of flowering plants. Key floriculture zones in a region often specialize in growing different types of flowers. Some major floriculture zones mentioned include Hosurzone, Chennai zone, Madurai zone, Trichy zone, Coimbatore zone, Kanyakumari zone, and Hill area zone. These zones are important for commercial flower production.
(d) Azospirillum: Azospirillum is a type of bacteria that helps plants by fixing atmospheric nitrogen, meaning it converts nitrogen gas from the air into a form plants can use. It can transport these nitrogen nutrients to crop plants. This bacteria also helps increase the productivity of grains, such as cereals (by 5-20%), millets (by 30%), and fodders (by 50%). It's an important biofertiliser that naturally boosts crop yield.
In simple words: Greenhouses help grow healthy plants with less water and high yield. The Uzhavan app gives farmers info on subsidies and seeds. Major floriculture zones are places where many flowers are grown. Azospirillum is bacteria that helps plants get nitrogen from the air, making crops grow better.

🎯 Exam Tip: For "short notes" on multiple topics, provide concise, clear, and distinct points for each sub-part. Highlight their main function or importance.

 

Question 10. Explain the feeding management of dairy cattle.
Answer: Proper feeding management is crucial for healthy dairy cattle and good milk production.

1. Dairy cattle need a well-balanced diet that contains all the necessary nutrients in the right amounts. This includes carbohydrates, proteins, fats, vitamins, and minerals.
2. To ensure optimal health and productivity, food additives are often included in their diet. These additives typically contain essential minerals, vitamins, antibiotics (to prevent diseases), and hormones (to promote growth and milk yield).
3. The daily average feed ratio for a milking cow is specific. It usually includes about 15-25 kg of roughage, which can be dry grass and green fodder. Additionally, they require 4-5 kg of a green mixture for fresh nutrients. Finally, dairy cattle need a large amount of water, typically 100-150 liters per day, for hydration and milk production.

Following these guidelines helps ensure the cattle are healthy, produce good quality milk, and are protected from various diseases.
In simple words: To keep dairy cows healthy and producing good milk, they need a balanced diet with all nutrients, extra minerals and vitamins, and specific amounts of roughage, green mixture, and plenty of water daily.

🎯 Exam Tip: When explaining feeding management, focus on three key aspects: balanced diet, role of additives, and specific daily feed ratios (roughage, green mixture, water) for clarity.

 

X. Thinking Skills

 

Question 1. Arun and Akash were given fertilisers and earthworm compost both to be used in the fields. Akash preferred to use earthworm compost. Why did not select the fertilizers?
Answer: Akash likely chose earthworm compost over synthetic fertilizers because he understood the long-term benefits and potential harms. Inorganic fertilizers, while providing quick nutrients, can pollute the soil and water over time. They often contain harsh chemicals that are toxic to beneficial microorganisms in the soil and can lead to health problems for both plants and humans if not managed properly. Earthworm compost, on the other hand, is a natural alternative that enriches the soil, improves its structure, and introduces beneficial microbes without any harmful chemicals, making it a sustainable and healthier choice for farming. This choice shows an awareness of eco-friendly farming methods.
In simple words: Akash chose earthworm compost because it's natural and doesn't harm the soil or environment like chemical fertilizers do. Chemical fertilizers can pollute and cause health problems.

🎯 Exam Tip: When explaining Akash's choice, highlight the negative impacts of inorganic fertilizers (pollution, toxicity) and the positive impacts of earthworm compost (soil enrichment, natural). This shows critical thinking.

 

Question 2. What is pasturage and how is it related to honey production?
Answer: Pasturage refers to land covered with herbaceous vegetation, typically used for grazing livestock without strict regulation, often found in dry farming areas. For honey production, pasturage is very important because it represents the main source of nectar and pollen for honey bees. A rich and diverse pasturage, with many flowering plants, provides a better habitat for honey bees. The more flowers and nectar sources available in the pasturage, the more food the bees can collect. This directly leads to higher quality and quantity of honey produced by the bee colonies. Thus, good pasturage is essential for successful beekeeping and honey yields.
In simple words: Pasturage is land with lots of plants and flowers. It is important for honey because bees get nectar and pollen from these plants, which they use to make honey. Better pasturage means more honey.

🎯 Exam Tip: Define pasturage clearly, then explain the direct link to honey production by detailing how it provides nectar and pollen, which are essential for bees.