Maharashtra Board Class 9 Science Chapter 17 Introduction to Biotechnology Solutions

Std 9 Science Chapter 17 Introduction To Biotechnology Question Answer Maharashtra Board

Class 9 Science Chapter 17 Introduction To Biotechnology Question Answer Maharashtra Board

Question 1. Each of the following statements is wrong. Rewrite them correctly by changing either one or two words.
a. Simple squamous epithelium is present in the respiratory tract.
b. Glandular epithelium is present in kidneys.
c. Chlorenchyma helps the plant to float in water.
d. Striated muscles are also called involuntary muscles.
e. Chloroplast is present in permanent tissue.
Answer:
a. False. Ciliated columnar epithelium is present in respiratory tract.
b. False. Cuboidal epithelium is present in kidneys.
c. False. Aerenchyma helps the plant to float in water.
d. False. Striated muscles are also called voluntary muscles.
e. False. Chlorenchyma is present in permanent tissue.
In simple words: This question tests your understanding of basic tissue types and their functions in plants and animals. Each original statement is incorrect and needs a specific word or two changed to make it biologically accurate.

🎯 Exam Tip: Pay close attention to the specific names and locations of different tissues. Accuracy in biological terminology is crucial for scoring well.

 

Question 2. Identify the odd word and explain why it is odd.
a. Xylem, phloem, permanent tissue, meristematic tissue.
Answer:
Meristematic tissue. It has the ability to divide whereas the others have lost the ability to divide.
In simple words: Meristematic tissue is unique because its cells can divide, unlike the other listed tissues which are permanent and have lost this ability.

🎯 Exam Tip: Understanding the fundamental characteristics of plant tissues, especially their division capabilities, is key. Distinguish between dividing (meristematic) and non-dividing (permanent) tissues.

 

b. Epithelium, Muscle fibre, nerve fibre, the epidermis.
Answer:
Epidermis. It is a plant tissue whereas the others are animal tissues.
In simple words: Epidermis is a plant tissue, while epithelium, muscle fiber, and nerve fiber are all types of animal tissues.

🎯 Exam Tip: Clearly differentiate between plant and animal tissues. Knowledge of examples for each category is important.

 

c. Cartilage, bone, tendon, cardiac muscle.
Answer:
Cardiac muscle. It is a muscular tissue whereas the others are connective tissues.
In simple words: Cardiac muscle is a type of muscular tissue, distinct from cartilage, bone, and tendon, which are all types of connective tissues.

🎯 Exam Tip: Be able to classify different body components into their respective tissue types (e.g., muscular, connective, epithelial, nervous).

 

Question 3. Write the names of the following tissues.
a. Tissue lining inner surface of mouth.
Answer:
Squamous epithelium.
In simple words: The inner surface of the mouth is lined by squamous epithelium, a protective tissue layer.

🎯 Exam Tip: Memorize the specific locations of different epithelial tissues. Knowing examples of where each type is found helps in recall.

 

b. Tissue joining muscles and bones.
Answer:
Tendon
In simple words: Tendons are strong connective tissues that attach muscles to bones, facilitating movement.

🎯 Exam Tip: Understand the roles of tendons (muscle to bone) and ligaments (bone to bone) as key connective tissues in the body.

 

c. Tissue responsible for increasing height of plants.
Answer:
Apical meristem.
In simple words: Apical meristem, found at the tips of roots and shoots, is responsible for the primary growth of plants, leading to an increase in height.

🎯 Exam Tip: Relate each type of meristematic tissue to its specific growth function (e.g., apical for height, lateral for girth).

 

d. Tissue responsible for increasing girth of stem.
Answer:
Lateral meristem.
In simple words: Lateral meristem, located along the sides of stems and roots, causes an increase in the stem's diameter or girth.

🎯 Exam Tip: Distinguish between apical and lateral meristems and their respective roles in plant growth (length vs. width).

 

Question 4. Write the differences.
Simple tissue and complex tissues in plants.
Answer:

Simple Tissue in plants	Complex Tissues in plants
(i) They are made up of only one type of cells.	(i) They are made up of more than one type of cells.
(ii) They are found in all parts of the plant.	(ii) They are found in the vascular regions of the plant.
(iii) They perform different functions like storage of food, support, giving strength etc.	(iii) They mainly perform the function of conduction of water and food.
(iv) Examples - Parenchyma, Collenchyma, Sclerenchyma.	(iv) Example - Xylem and phloem.

In simple words: Simple tissues in plants are made of one cell type and are found broadly, performing general functions like storage, while complex tissues are made of multiple cell types, found in vascular regions, and specialized for transport of water and food.

🎯 Exam Tip: When differentiating tissues, focus on key aspects like cell composition (one type vs. multiple types), location, and primary functions to create a clear comparison.

 

Question 5. Write short notes.
a. Meristematic tissue.
Answer:

• Meristematic tissue is present in specific parts of a plant where growth takes place.
• Cells of meristematic tissue contain thick cytoplasm, a conspicuous nucleus and a thin cell wall and are compactly packed together.
• Vacuoles are usually absent in these cells and they are highly active.
• The main function of meristematic tissue is to bring about plant growth.
• According to the location, meristematic tissues are of three types: Apical meristem, intercalary meristem and lateral meristem.

In simple words: Meristematic tissue, found in growing regions of plants, consists of active, compactly packed cells that enable plant growth and are classified into apical, intercalary, and lateral types based on their location.

🎯 Exam Tip: When writing short notes, include defining characteristics, location, cell properties, and main functions. Listing types is also beneficial.

 

b. Xylem
Answer:

• Xylem is a complex permanent tissue in plants.
• It consists of thick-walled dead cells.
• The type of cells in xylem are trachieds, vessels, xylem fibres (dead cells) and xylem parenchyma (living cells).
• Its structure is like interconnected tubes conduct water and minerals only in upward direction.

In simple words: Xylem is a plant tissue primarily composed of dead, thick-walled cells that form interconnected tubes, responsible for transporting water and minerals upwards from roots to the rest of the plant.

🎯 Exam Tip: For complex tissues like xylem, remember their classification (complex permanent), the types of cells they contain (dead/living), and their specific transport function and direction.

 

c. Striated muscles.
Answer:

• The cells of striated muscles are long, cylindrical, multinucleate and have no branches.
• These are alternate dark and light bands on these muscles.
• As they are attached to bones, they are also called skeletal muscles.
• They move as per our will, hence they are called voluntary muscles.
• Striated muscles bring about movements of arms and legs, running, speaking etc.

In simple words: Striated muscles are long, cylindrical, voluntary muscles attached to bones, characterized by alternating dark and light bands, and are responsible for controlled body movements like walking and speaking.

🎯 Exam Tip: Focus on the structural features (shape, nucleus, bands), location (attached to bones), and control mechanism (voluntary) when describing striated muscles.

 

d. Agro-complementary business.
Answer:
(i) The business that are complementary to agriculture and generate supplementary income for the farmers are called agro-complementary business.
(ii) These include:

• Animal Husbandry: It is practiced for milk production and for using the cattle as help in farming operations, e.g. cows and buffaloes are raised for milk whereas bulls and male buffaloes for pulling heavy loads.
• Poultry farming: It is the rearing of egg and meat yielding chickens. Chickens raised for eggs are called layers while those raised for meat are called broilers.
• Sericulture: It is the rearing of silkworms (moths) for silk production. The silk fibres obtained are processed, reeled and then woven into fabric.

In simple words: Agro-complementary businesses are activities like animal husbandry, poultry farming, and sericulture that support agriculture and provide additional income to farmers.

🎯 Exam Tip: Provide clear examples and brief descriptions for each type of agro-complementary business to show comprehensive understanding.

 

e. Genetic engineering
Answer:

• Genetic engineering is the deliberate modification of the characteristics of an organism by manipulating its genetic material.
• An organism that is generated through genetic engineering is called a genetically modified organism (GMO).
• Genetic engineering is applied in many fields like research, agriculture, industrial biotechnology and medicine.
• In agriculture, genetic engineering is used in the production of cash crops, improvement in varieties of cash crops, increase in ability of plants to withstand environmental stresses.
• In medicine, genetic engineering is used for vaccine production, early diagnosis of congenital disease, organ transplant, cancer research, production of artificial skin, cartilage etc. in laboratories.

In simple words: Genetic engineering involves intentionally changing an organism's genetic material to alter its traits, creating genetically modified organisms (GMOs), and has wide applications in agriculture, medicine, and research for various improvements.

🎯 Exam Tip: Define genetic engineering precisely, mention GMOs, and cite specific applications in different sectors like agriculture and medicine, with examples.

 

f. Sericulture
Answer:

• Sericulture is the rearing of silkworms (moths) for production of silk.
• Bombyx mori is the most commonly used variety of silkworm for this purpose.
• The life cycle of silkworm consist of four stages namely egg, larva, pupa and adult.
• Thousands of eggs deposited by female moths are incubated artificially to shorten the incubation period.
• Larvae hatching out of eggs are released on mulberry plants.
• Larvae are nourished by feeding on mulberry leaves.
• After feeding for 3-4 days, larvae move to branches of mulberry plant.
• The silk thread is formed from the secretion of their salivary glands.
• Larvae spin this thread around themselves to form a cocoon. The cocoon may be spherical in nature.
• Ten days before the pupa turns into an adult, all the cocoons are transferred into boiling water.
• Due to the boiling water, the pupa dies in the cocoon and silk fibres become loose.
• These fibres are unwound, processed and reeled. Various kinds of fabric is woven from silk threads.

In simple words: Sericulture is the cultivation of silkworms, primarily Bombyx mori, to produce silk, involving rearing the worms, feeding them mulberry leaves, and processing the silk threads from their cocoons through a detailed life cycle management.

🎯 Exam Tip: Detail the key steps in the silkworm life cycle and the process of silk extraction, including why cocoons are boiled, to demonstrate a full understanding of sericulture.

 

Question 6. Explain the meaning of biotechnology and its impact on agricultural management with suitable examples.
Answer:
The techniques of bringing about improvements in living organisms by artificial genetic changes and by hybridization for the welfare of human beings, are together called biotechnology. Impact of biotechnology on agricultural management:

• Genetically modified crops (GM crops) are being produced by introducing changes in DNA of natural crops.
• Normally such varieties are not found in nature.
• Thus, new varieties are produced artificially Different useful characters are introduced in such varieties.
• Some naturally occurring varieties cannot withstand environmental stress like frequently changing temperature.
• Wet and dry famines, changing climates etc. However, GM crops can grow in any of such adverse conditions.
• As GM crops are resistant to insect pests, pathogens, chemical weedicides, etc. the use of harmful chemicals like pesticides can be avoided.
• Due to use of seeds of GM crops, there is improvement in nutritive value and decrease in loss of crops.

In simple words: Biotechnology refers to methods used to improve organisms through genetic alteration and hybridization for human benefit. In agriculture, it leads to genetically modified (GM) crops that are resilient to environmental stresses, resistant to pests, and have improved nutritional value, reducing reliance on harmful chemicals.

🎯 Exam Tip: Define biotechnology clearly and then elaborate on its multi-faceted impact on agriculture, providing specific advantages of GM crops to score comprehensive marks.

 

Draw neat and labelled diagrams of the following:
ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र पैरेन्काइमा ऊतक की अनुप्रस्थ और अनुदैर्ध्य काट को दर्शाता है। इसमें कोशिकाएँ ढीली व्यवस्थित होती हैं, जिनके बीच अंतराकोशिकीय स्थान, साइटोप्लाज्म, एक केंद्रक, मध्य पटलिका, क्लोरोप्लास्ट और एक बड़ी रिक्तिका दिखाई गई है। यह पादप में भोजन के भंडारण और सहायता के लिए महत्वपूर्ण है।

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र कॉलेनकाइमा ऊतक की अनुप्रस्थ और अनुदैर्ध्य काट को दर्शाता है। इसकी कोशिकाओं में मोटी दीवारें होती हैं, विशेषकर कोनों पर, और एक कोशिका भित्ति होती है। इसमें अंतराकोशिकीय स्थान, साइटोप्लाज्म, एक केंद्रक, क्लोरोप्लास्ट और एक रिक्तिका भी दिखाई गई है। यह पादप को लचीलापन और यांत्रिक सहायता प्रदान करता है।

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक तंत्रिका कोशिका (न्यूरॉन) को दर्शाता है। इसमें एक केंद्रक युक्त कोशिका काय, डेंड्राइट्स (शाखाएँ जो संकेत प्राप्त करती हैं), और एक लंबा एक्सॉन (जो संकेतों को दूर ले जाता है) शामिल हैं। यह शरीर में विद्युत आवेगों के संचरण के लिए जिम्मेदार है।

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र स्क्लेरेन्काइमा ऊतक की अनुप्रस्थ और अनुदैर्ध्य काट को दर्शाता है। इसमें कोशिकाएँ संकीर्ण लुमेन और लिग्निफाइड मोटी दीवारों के साथ दिखाई गई हैं। ये मृत कोशिकाएँ होती हैं जो पादप को यांत्रिक शक्ति और दृढ़ता प्रदान करती हैं।

 

Question 7. Which two main techniques are used in biotechnology? Why?
Answer:

• The two main techniques used in biotechnology are - Genetic engineering and tissue culture.
• These techniques are used to bring about improvements in living organisms by artificial genetic changes and by hybridization for the welfare of human beings.
• Its uses are in the production of cash crops, improvement in varieties of cash crops, early diagnosis of congenital diseases, organ transplant, cancer research, production of artificial skin, cartilage etc. in laboratories.

In simple words: Biotechnology primarily uses genetic engineering to modify genetic material and tissue culture to grow cells or tissues, both aiming to improve living organisms for human welfare, with applications in developing better crops, diagnosing diseases, and medical research.

🎯 Exam Tip: Clearly name the two main techniques and then explain their collective purpose and diverse applications, especially highlighting both agricultural and medical uses.

 

Question 8. Discuss 'Agritourism' in the class and write a project on an agrotourism centre nearby. Present it in the class in groups.
Answer:

• In agritourism, plantlets of flowering, medicinal, ornamental, vegetable plants and fruit trees are produced on a large scale by tissue culture technique.
• By growing some of the plants fully, an agritourism centre can be developed.
• If sufficient land is available, the emerging field of agritoursim would be a good business.
• An agritourism centre consists of following:
  (a) Mango, chikoo (sapota), guava, coconut, custard apple and some other regional fruit trees.
  (b) Shade giving local or exotic attractive plants.
  (c) Ornamental and flowering plants.
  (d) Butterfly garden.
  (e) Medicinal plant garden.
  (f) Organic vegetables and fruits.

• People visit places with such attraction in large numbers.
• Selling plantlets/seedlings, fruits, vegetables at such places can be quite profitable.

In simple words: Agritourism involves developing farm-based attractions where people can experience rural life, often featuring plant nurseries, fruit orchards, medicinal gardens, and organic farms, creating an enjoyable experience for visitors and a profitable venture for farmers.

🎯 Exam Tip: When discussing agritourism, emphasize its dual benefits-recreational for visitors and economic for farmers-and list diverse components that make up such a center.

 

Question 9. Define the term tissue and explain the concept of tissue culture.
Answer:
A group of cells having the same origin, same structure and same function is called tissue. Concept of tissue culture:

• Ex vivo growth of cells or tissues in an aseptic and nutrient-rich medium is called tissue culture.
• Nowadays, a complete organism can be developed from a single cell or from tissue with the help of the tissue culture technique.
• A liquid, solid or gel-like medium prepared from agar, which supplies nutrients and energy necessary for tissue culture is used in this technique.
• Tissue culture can be used to grow plants on a large scale, which bear flowers, fruits of excellent quality, in shorter durations and are disease free.
• The various processes involved in tissue culture are:

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र ऊतक संवर्धन की विभिन्न प्रक्रियाओं को दर्शाता है, जिसमें स्रोत पौधे से एक बल्ब/कॉर्न लेना, प्राथमिक उपचार, प्राथमिक दृढ़ता, शूट और जड़ विकास, प्रजनन/गुणा, और द्वितीयक दृढ़ता शामिल है। यह एक चक्रीय प्रक्रिया है जिसके द्वारा एक पौधे के छोटे हिस्से से पूरे पौधे विकसित किए जा सकते हैं।

In simple words: Tissue is a group of cells with a shared origin, structure, and function. Tissue culture is a technique for growing cells or tissues outside an organism in a sterile, nutrient-rich medium, allowing for the large-scale production of whole organisms, especially plants with desired traits and disease resistance.

🎯 Exam Tip: Provide a concise definition of tissue, then thoroughly explain tissue culture, including its environment, medium, and key advantages like rapid propagation and disease-free plant production.

 

Question 10. 'Rearing of sheep is a livestock'. Justify this statement.
Answer:

• The term livestock refers to animals reared for profit or for use.
• Sheep provides us with wool, skin, meat and milk.
• Therefore, rearing of sheep is a livestock.

In simple words: Rearing sheep is considered livestock farming because they are animals kept for economic gain, providing valuable products like wool, skin, meat, and milk.

🎯 Exam Tip: Clearly define "livestock" and then provide specific examples of products obtained from sheep to justify why they fall under this category.

 

Class 9 Science Chapter 17 Introduction To Biotechnology Intext Questions And Answers

 

Question 1. Which components bring about important processes in the living organisms?
Answer:
Cells, tissues, organs, organ systems bring out important processes in living organisms.
In simple words: In living organisms, cells, tissues, organs, and organ systems work together in a hierarchical manner to perform all essential life processes.

🎯 Exam Tip: Understand the levels of organization in living organisms, from cells to organ systems, and how they contribute to overall biological functions.

 

Question 2. Which is the smallest structural and functional unit of the body of living organisms?
Answer:
Cell is the smallest structural and functional unit of the body of living organisms.
In simple words: The cell is the fundamental unit of life, responsible for all basic functions and building blocks of any living organism.

🎯 Exam Tip: Remember the basic definition of a cell as the fundamental unit of life, a core concept in biology.

 

Question 3. Which type of muscle is the diaphragm of the respiratory system?
Answer:
Diaphragm is a skeletal muscle. It is an involuntary muscle that regulates breathing, although some voluntary control can be achieved.
In simple words: The diaphragm, a crucial muscle for breathing, is a skeletal muscle that primarily functions involuntarily but can be consciously controlled to a limited extent.

🎯 Exam Tip: Identify the diaphragm as a unique skeletal muscle due to its dual voluntary and involuntary control, essential for respiratory function.

 

Question 4. What is the main difference between the growth of animals and plants?
Answer:

• Growth in animals is uniform whereas the growth in plants occurs in specific parts of the body.
• Growth in animals occurs for a certain period of life whereas the growth in plants occur throughout their life.

In simple words: Animals show uniform growth for a limited period, while plants exhibit localized growth in specific areas (meristems) throughout their entire life.

🎯 Exam Tip: Highlight the two primary distinctions: uniform vs. localized growth, and limited vs. continuous growth, to clearly differentiate plant and animal development.

 

Question 5. Why does the growth of a plant occur only at specific parts of the plant body?
Answer:
Growth of a plant occurs only at specific parts of the body due to the presence of meristematic tissues which contain dividing cells.
In simple words: Plant growth is localized because only specific regions contain meristematic tissues, which are composed of actively dividing cells.

🎯 Exam Tip: The key concept here is meristematic tissue. Explain its role in cell division and localized growth to fully answer the question.

 

Question 6. Suppose you want to grow a garden like the one shown in the picture, around your home or school. What would you do to achieve that? By which methods will you cultivate the seedlings?
ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र केले के पौधों की ऊतक संवर्धन द्वारा खेती को दर्शाता है, जिसमें छोटे पौधे ग्रीनहाउस जैसी संरक्षित परिस्थितियों में विकसित हो रहे हैं, और फिर उन्हें खेत में रोपा जा रहा है। यह उच्च गुणवत्ता वाले पौधों के बड़े पैमाने पर उत्पादन की एक विधि है।

Answer:

• To grow a garden around the school or home, one must cultivate seedlings of different plants and those seedlings must be watered regularly and nurtured properly.
• Seedlings can be cultivated by the following methods:
  (a) Seed sowing: Seeds are sown, watered and allowed to germinate.
  (b) Transplantation: Seeds are sown somewhere else and then the seedlings are transplanted in the garden.

In simple words: To create a garden, one would cultivate various plant seedlings through seed sowing or transplantation, ensuring regular watering and care.

🎯 Exam Tip: When describing cultivation methods, include both traditional (seed sowing, transplantation) and the importance of ongoing care for successful gardening.

 

Question 7. You must have seen flowers of same variety but of 2 or 3 different colours borne by same plant. How is this possible?
Answer:
1. The different coloured flowers borne by the same plant are due to the pigments like anthocyanins, carotenoids etc. according to the genetic makeup of the plant.
2. Also, by using the latest techniques of biotechnology and tissue culture, it is possible to manipulate the genes for flower colour and get the desired flower colour.
In simple words: Different colored flowers on the same plant can occur due to its genetic makeup producing various pigments or through biotechnology and tissue culture techniques that manipulate genes to achieve desired flower colors.

🎯 Exam Tip: Explain both natural genetic variation (pigments) and biotechnological interventions (gene manipulation) as reasons for multiple flower colors on a single plant.

 

Question 8. What keeps the various organs and organ systems separate from each other? Why?
Answer:
The epithelial tissue keeps the various organs and organ systems separate from each other by forming a layer on the organs.
In simple words: Epithelial tissue acts as a protective lining or covering, forming layers that compartmentalize and keep different organs and organ systems distinct within the body.

🎯 Exam Tip: Focus on the structural role of epithelial tissue as a covering/lining to explain how it maintains separation and integrity of organs.

 

Question 9. Why are epithelial tissues said to be simple tissues?
Answer:
Epithelial tissues are said to be simple tissues as they are made up of only one type of cells.
In simple words: Epithelial tissues are called simple tissues because they are composed of a single layer of identical cells, as opposed to complex tissues made of multiple cell types.

🎯 Exam Tip: The key differentiator for "simple tissue" is its composition of a single cell type. State this clearly.

 

Question 10. Why do slim persons feel more cold in winter than those who are obese?
Answer:

• Below the skin, there is a tissue called adipose tissue.
• The cells of these tissue are filled with fat droplets.
• Due to storage of fat, it acts as an insulator and helps to retain heat in the body.
• Obese people have more fat deposited in the adipose tissue as compared to slim persons. Therefore, slim persons feel more cold in winter than those who are obese.

In simple words: Slim persons feel colder than obese individuals because they have less adipose tissue, which stores fat and acts as an insulating layer to retain body heat.

🎯 Exam Tip: Explain the insulating property of adipose tissue (fat storage) and directly link the amount of fat to body heat retention, comparing slim and obese individuals.

 

Question 11. Why can bones not be folded?
Answer:

• Bone cells called osteocytes are embedded in solid ground substance made up of calcium phosphate.
• This makes the bone hard, rigid and non-flexible. Therefore, bones cannot be folded.

In simple words: Bones cannot be folded because their cells (osteocytes) are embedded in a hard, rigid matrix composed primarily of calcium phosphate, giving them their inflexible structure.

🎯 Exam Tip: The rigidity of bones is due to the calcium phosphate matrix. Focus on this structural component and its effect on flexibility.

 

Question 12. Which other industries can be started as an extension of the plant nursery business?
Answer:
Businesses like Agritourism, Ecotourism, forest resorts and organic fruit gardens, yoga and meditation centres can be started as an extension of the plant nursery business.
In simple words: Expanding a plant nursery business can include ventures like agritourism, ecotourism, forest resorts, organic fruit gardens, and wellness centers, leveraging the green environment and cultivation expertise.

🎯 Exam Tip: Think broadly about complementary businesses that benefit from a natural, plant-rich environment, connecting nursery skills with hospitality, wellness, or sustainable agriculture.

 

Question 13. To which places do people choose to go on vacation in order to relax when they are tired of crowds and stressful life?
Answer:
People choose to go to hill stations, beaches, forest resorts and places where there is lot of greenery to relax when they are tired of crowds and stressful life.
In simple words: To escape stress, people often vacation in serene natural settings like hill stations, beaches, or forest resorts, where abundant greenery offers relaxation away from city crowds.

🎯 Exam Tip: List a variety of natural retreats that offer peace and quiet, emphasizing the common element of natural beauty and distance from urban stress.

 

Question 14. What is the inter-relationship between the two questions (7 and 8) above?
Answer:
The inter-relationship between the above two questions is that businesses like agritourism, ecotourism, forest resorts etc. can fetch a huge profit as people look for these kind of places to relax, to be away from the hustle and bustle of city life and feel close to nature.
In simple words: Questions 7 and 8 are related because they both highlight how various nature-based businesses, such as agritourism and ecotourism, are becoming profitable as people seek relaxation and connection with nature away from urban stress.

🎯 Exam Tip: Connect the concepts of relaxation in nature (Q13) with the business opportunities (Q12) that cater to this demand, showing how market needs drive new ventures.

 

Question 15. Why are the cocoons transferred to boiling water before the pupa develops into an adult?
Answer:

• Once the pupa develops into an adult, it will secrete a fluid to dissolve the silk and emerge out.
• Hence the cocoons are transferred to boiling water before the pupa develops in to an adult to kill the silkworms before transformation is complete.

In simple words: Silkworm cocoons are boiled before the pupa fully develops into an adult moth to kill the pupa and prevent it from dissolving the silk threads when it emerges, thus preserving the valuable silk.

🎯 Exam Tip: Explain the dual purpose of boiling: preventing silk damage by the emerging moth and ensuring the continuity of the silk thread, which is crucial for quality silk production.

 

Question 16. Why we cannot see our organs like the heart, blood vessels and intestines?
Answer:
We cannot see our organs like the heart, blood vessels and intestines as they are located inside the body.
In simple words: We cannot see internal organs like the heart, blood vessels, and intestines because they are situated deep within the body, protected by outer layers.

🎯 Exam Tip: A simple answer is sufficient: internal organs are not visible because they are located inside the body for protection and functional positioning.

 

Question 17. What is meant by white revolution? Who was its pioneer? What benefits did it bring?
Answer:

• White revolution was the programme launched by the National Dairy Development Board to increase the milk production in India.
• Dr. Verghese Kurien was the pioneer of white revolution.
• It transformed India from a milk-deficient nation to the largest producer of milk. It also helped the dairy farmers in directing their own development and empowering them.

It also helped to reduce the malpractices carried out by milk traders and merchants.
In simple words: The White Revolution was an Indian program initiated by Dr. Verghese Kurien to boost milk production, successfully transforming India into the world's largest milk producer, empowering dairy farmers, and reducing unfair trade practices.

🎯 Exam Tip: Define White Revolution, name its pioneer, and elaborate on its key impacts, such as increased milk production, farmer empowerment, and reduction of market malpractices.

Answer the Following Questions:

Question 1. Collect information about GM varieties of crops in your area and make a note of them. Also find out if there are adverse effects of GM crops on human beings and environment.
Answer:

• Some of the GM crops are:
  (a) Maize: MON 810, MON 863
  (b) Rice: Golden rice
  (c) Brinjal: BT brinjal
  (d) Cotton: BT cotton
• Effects of GM Crops on human beings: GM crops may cause toxicity and allergic reactions in human.
• Effects of GM Crops on environment:
  (a) GM crops may be toxic to pollinators and non-target species like butterflies.
  (b) Many GM crops may be a threat to soil ecosystem as they secrete their toxins into the soil.

In simple words: Genetically Modified (GM) crops are engineered to possess specific traits like disease resistance or enhanced nutrition. While they offer benefits such as increased yield, concerns exist regarding potential toxicity, allergic reactions in humans, and negative impacts on pollinators and soil ecosystems.

🎯 Exam Tip: When discussing GM crops, always present both their advantages (e.g., higher yield, pest resistance) and potential disadvantages (e.g., environmental impact, health concerns) for a balanced answer.

 

Question 2. As shown in the figure, place an onion on each gas jar in such a way that its base (roots) will remain dipped in water. Measure and record the length of the roots of both onions on the first, second and third day. On the fourth day, cut off 1 cm of the roots of the onion in flask B Measure the length of the roots of both onions for the next five days and record your observations in the following table.
Answer:
ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र दो प्याज दिखाता है, जिनमें से प्रत्येक एक गैस जार में रखा गया है जिसमें पानी भरा है, ताकि प्याज की जड़ें पानी में डूबी रहें। जार 'A' में प्याज की जड़ें अनकटी हैं, जबकि जार 'B' में प्याज की जड़ों का निचला सिरा कटा हुआ दिखाया गया है। यह व्यवस्था प्याज की जड़ों की वृद्धि पर मेरिस्टेमेटिक ऊतक के प्रभाव को दर्शाती है।

Length (cm)	Day 1	Day 2	Day 3	Day 4	Day 5
Flask A	(Record observation)	(Record observation)	(Record observation)	(Record observation)	(Record observation)
Flask B	(Record observation)	(Record observation)	(Record observation)	(Record observation)	(Record observation)

(Students are expected to record their observation in the given table).
(a) Which onion has longer roots? Why?
Answer: The onion in jar A has longer roots as it continues to grow due to the presence of meristematic tissue at root tip which had dividing cells.
(b) Why did the roots of the onion in jar B stop growing?
Answer: The roots of onion in jar B stopped growing as the meristematic tissue present in the root tips were cut off.In simple words: This experiment demonstrates that meristematic tissue at the root tip is responsible for root growth. When this tissue is removed (in flask B), growth ceases, while roots with intact meristematic tissue (in flask A) continue to grow.

🎯 Exam Tip: Questions involving experimental setups often test your understanding of biological principles. Be sure to link observations to underlying biological reasons, such as the role of meristematic tissue in plant growth.

 

Question 3. Take a fresh and fleshy leaf of Rhoeo, lily or any other plant. Pull and press it, tearing it obliquely in such a way that its transparent epidermis will be visible at the cut margins. Take the transparent epidermis with the forceps and keep it in dilute safranin solution for 1 minute. Spread it on a slide, cover it with a cover-slip and observe it under a compound microscope.
Answer:

• The cells of the epidermis are flat and polygonal and there are no intercellular spaces between them.
• A single continuous layer is formed.
• The epidermis is covered by a waxy cuticle.

In simple words: Observing a plant's epidermis under a microscope reveals a tightly packed, single layer of flat, polygonal cells, often covered by a protective waxy cuticle, with no gaps between cells.

🎯 Exam Tip: Practical-based questions require knowledge of both procedure and expected observations. When describing microscopic observations, be precise about cell shape, arrangement, and any distinguishing features like the cuticle.

 

Question 4. Establish your own plant nursery near your school or home. Prepare the seedlings of flowering plants, fruit plants, and ornamental plants being grown in your area. Can you start a business in the future with the help of this activity? Think it over.
Answer: (Students are expected to do this activity on their own.)
Yes, we can start a business of plant nursey in future. If sufficient land is available, the emerging field of agritourism would be a good business.In simple words: Starting a plant nursery is a practical way to learn about plant cultivation, and with enough land, it can evolve into a profitable agritourism business.

🎯 Exam Tip: For open-ended questions like this, emphasize practical steps and link them to real-world applications or entrepreneurial opportunities, showing a broader understanding.

 

Question 5. Observe the skin of the back of your hand with the help of a magnifying lens. Do you see the closely attached squarish and pentagonal shapes?
Answer: Yes, we can see the squarish and pentagonal shapes. This is the stratified squamous epithelium present on the outer layer of skin.In simple words: When observing the skin with a magnifying lens, the visible squarish and pentagonal shapes are the cells of the stratified squamous epithelium, which forms the protective outer layer of our skin.

🎯 Exam Tip: Relate everyday observations to specific biological structures. Knowing the types of epithelial tissues and their locations is crucial for such questions.

 

Question 6. Observe a permanent slide of blood smear under a compound microscope. What did you see?
Answer:

• A permanent slide of blood smear under a compound microscope shows different types of cells like RBCs, WBCs and platelets.
• The different types of WBCs that can be seen are eosin mphocytes.

In simple words: Under a microscope, a blood smear reveals various blood cells, including red blood cells (RBCs), white blood cells (WBCs), and platelets, with WBCs further categorized into types like eosinophils and lymphocytes.

🎯 Exam Tip: When describing microscopic observations of blood, ensure you name the key components (RBCs, WBCs, platelets) and can differentiate between major WBC types.

 

Question 7. Visit a modern cowshed nearby and record the following points - The number of cattle, their variety, total milk production, cleanliness in cattle-shed, arrangements for health care of cattle.
Answer: Students are expected to do this activity on their own.In simple words: This activity involves visiting a modern cowshed to observe and record details like cattle count, breeds, milk production, hygiene, and healthcare facilities.

🎯 Exam Tip: Field visit questions assess observational skills and ability to connect theoretical knowledge to real-world practices. Focus on systematic data collection and analysis.

 

Question 8. Collect more information about animal husbandry.
Answer:

• The branch of agriculture which deals with the feeding, shelter, health and breeding of domestic animals is called animal husbandry.
• It is a scientific and systematic management of livestock.
• Animal husbandry practices include:
  (a) Proper food and clean drinking water.
  (b) Proper shelter
  (c) Proper methods of breeding
  (d) Prevention and cure of disease.
• Animal husbandary practices serve as an alternative income for the farmers and help to satisfy the need of food for man.

In simple words: Animal husbandry is the scientific management of livestock, covering feeding, shelter, health, and breeding, which provides supplementary income for farmers and fulfills human food needs.

🎯 Exam Tip: Clearly define animal husbandry and list its key practices and benefits. Mentioning its role in farmer income and food security adds value to your answer.

 

Question 9. Find out from the internet the average daily milk yield from local and exotic varieties of cow.
Answer:

• Milk yield from local cow : 12-15 litres/day.
• Milk yield from exotic cow: 15-30 litres/day.

In simple words: Local cow varieties typically yield 12-15 litres of milk per day, whereas exotic cow varieties can produce a higher average of 15-30 litres per day.

🎯 Exam Tip: For factual data questions, ensure accuracy in numerical ranges. Differentiating between local and exotic varieties demonstrates attention to detail.

 

Question 10. Are the structure and functions of the bodies of plants and animals the same? No. The structure and functions of the bodies of plants and animals are not the same. Some differences between plants and animals:
Answer:

Plants	Animals
Plants continue to grow throughout their life.	Animals grow only for a specific period of life.
Growth in plants in not uniform.	Growth in animals is uniform.
Plants have dividing and non-dividing tissues.	Animals do not have different dividing and nondividing tissues.
Plants are sedentary.	Animals generally move from place to place in search of food, shelter and partners.
Energy needs of plants are less.	Energy needs of animals are greater.
Plants can prepare their own food by photosynthesis.	Animals cannot prepare their own food. They depend on plants and other animals for their food.

In simple words: Plants and animals exhibit fundamental differences in growth patterns, mobility, tissue organization, and nutritional strategies, reflecting their distinct evolutionary paths and ecological roles.

🎯 Exam Tip: When comparing plants and animals, focus on key biological distinctions like growth (determinate vs. indeterminate), movement, presence of specialized tissues, and modes of nutrition.

Class 9 Science Chapter 17 Introduction to Biotechnology Additional Important Questions and Answers

Choose and write the correct option:

 

Question 1. Protective coverings in the animal body are called tissues.
(a) meristematic
(b) muscular
(c) epithelial
(d) bone
Answer: (c) epithelialIn simple words: Epithelial tissues form the protective covering of animal bodies and line internal organs, providing a barrier against external factors and regulating substance exchange.

🎯 Exam Tip: Remember that epithelial tissue is primarily for covering, lining, and protection in animals.

 

Question 2. Epithelial tissue is present in
(a) skin
(b) inner surface of blood vessels
(c) walls of the alveoli
(d) all of these
Answer: (d) all of theseIn simple words: Epithelial tissue is versatile and can be found forming the skin, lining blood vessels, and covering the walls of alveoli, performing protective and exchange functions.

🎯 Exam Tip: Epithelial tissue is widespread throughout the body, covering surfaces and lining cavities, which makes 'all of these' a common correct option when diverse locations are listed.

 

Question 3. helps in selective transport of substances.
(a) Squamous epithelium
(b) Stratified epithelium
(c) Cuboidal epithelium
(d) Columnar epithelium
Answer: (a) Squamous epitheliumIn simple words: Squamous epithelium, being thin and flat, is ideally suited for selective transport of substances across its surface, facilitating processes like diffusion.

🎯 Exam Tip: Associate squamous epithelium with thin, flat cells specialized for diffusion and selective transport due to their minimal thickness.

 

Question 4. helps in secretion of digestive juice, absorption of nutrients.
(a) Glandular epithelium
(b) Columnar epithelium
(c) Cuboidal epithelium
(d) Ciliated epithelium
Answer: (b) Columnar epitheliumIn simple words: Columnar epithelium, with its elongated cells and often microvilli, plays a crucial role in secretion, such as digestive juices, and efficient absorption of nutrients in areas like the intestine.

🎯 Exam Tip: Columnar epithelium is characterized by tall cells adapted for secretion and absorption, often found lining the digestive tract.

 

Question 5. supports internal organs
(a) Areolar tissue
(b) Adipose tissue
(c) Lymph
(d) Tendon
Answer: (a) Areolar tissueIn simple words: Areolar tissue is a loose connective tissue that fills spaces between organs, providing support and acting as a packing material.

🎯 Exam Tip: Identify areolar tissue as the primary packing tissue that supports and connects various organs within the body.

 

Question 6. tissue helps in insulation, supply of
Answer: (b) Adipose tissueIn simple words: Adipose tissue, composed of fat cells, is specialized for storing energy, providing insulation against cold, and cushioning organs.

🎯 Exam Tip: Recall that adipose tissue is the main tissue for fat storage, which consequently provides insulation and energy reserves.

 

Question 7. connect muscles to bones.
(a) Ligaments
(b) Tendons
(c) Cartilages
(d) Nerves
Answer: (b) TendonsIn simple words: Tendons are strong, fibrous connective tissues that efficiently attach muscles to bones, enabling movement.

🎯 Exam Tip: Remember the mnemonic "Muscles to Bones = Tendons" and "Bones to Bones = Ligaments" to distinguish between these connective tissues.

 

Question 8. join two bones to each other.
(a) Cartilages
(b) Tendons
(c) Ligaments
(d) Muscles
Answer: (c) LigamentsIn simple words: Ligaments are tough, elastic connective tissues that bind bones together at joints, providing stability and limiting excessive movement.

🎯 Exam Tip: Differentiate ligaments from tendons by their function: ligaments connect bones to bones, while tendons connect muscles to bones.

 

Question 9. meristem increases the length of root and stem.
(a) Intercalary
(b) Apical
(c) Lateral
(d) Permanent
Answer: (b) ApicalIn simple words: Apical meristem is found at the tips of roots and stems and is responsible for their primary growth, leading to an increase in length.

🎯 Exam Tip: Apical meristem is key for primary growth, i.e., increase in length of a plant, while lateral meristem is for girth.

 

Question 10. showed that cells and tissues can be grown ex vivo.
(a) Frederick Campion Steward
(b) Gregor Johann Mendel
(c) Frederick Miescher
(d) Robert Brown
Answer: (a) Frederick Campion StewardIn simple words: Frederick Campion Steward was a pioneering scientist who demonstrated that plant cells and tissues could be successfully cultured outside a living organism, a foundational step for tissue culture.

🎯 Exam Tip: Associate Frederick Campion Steward with his significant contribution to plant tissue culture, a key concept in biotechnology.

 

Question 11. is an example of genetically modified maize.
(a) Vaishali
(b) Vistive Gold
(c) MON 810
(d) Amflora
Answer: (c) MON 810In simple words: MON 810 is a well-known genetically modified maize variety engineered to produce an insecticide, offering resistance against certain pests.

🎯 Exam Tip: Remember specific examples of GM crops like MON 810 for maize and BT cotton to demonstrate knowledge of biotechnology applications.

 

Question 12. is an exotic variety of cow.
(a) Holstein
(b) Gir
(c) Sahiwal
(d) Dangi
Answer: (a) HolsteinIn simple words: Holstein is a widely recognized exotic variety of dairy cow, known globally for its high milk production capabilities.

🎯 Exam Tip: Be able to differentiate between common local and exotic breeds of livestock, especially for milk and meat production.

 

Question 13. is a layer chicken.
(a) Brahma
(b) Leghorn
(c) Cochin
(d) Aseel
Answer: (b) LeghornIn simple words: Leghorn is a popular breed of chicken primarily raised for its high egg-laying capacity, making it a classic 'layer' chicken.

🎯 Exam Tip: Understand the distinction between 'layer' chickens (for eggs) and 'broiler' chickens (for meat) and be familiar with examples of each.

 

Question 14. is a broiler chicken.
(a) Leghorn
(b) Lehman
(c) Aseel
(d) Minorca
Answer: (c) AseelIn simple words: Aseel is an indigenous Indian chicken breed known for its robust build and meat quality, commonly raised as a 'broiler' for meat production.

🎯 Exam Tip: Learn key examples for both layer and broiler chicken breeds, as they are frequently tested in objective questions.

 

Question 15. is a broiler chicken.
(a) Minroca
(b) Ancona
(c) Leghorn
(d) Cochin
Answer: (d) CochinIn simple words: Cochin is a large, heavily feathered chicken breed primarily raised for its meat, categorizing it as a broiler chicken.

🎯 Exam Tip: Keep a list of different chicken breeds and categorize them as either layers or broilers for quick recall.

 

Question 16. Cartilage is found
(a) all around the cells in body
(b) in nose, ear, larynx, trachea
(c) between the muscles and skin
(d) around the blood vessels
Answer: (b) in nose, ear, larynx, tracheaIn simple words: Cartilage is a flexible connective tissue primarily located in structures requiring support with some elasticity, such as the nose, ears, larynx, and trachea.

🎯 Exam Tip: Focus on the specific locations of cartilage, which are often associated with flexible support rather than rigid structural roles like bone.

 

Question 17. Which of the following is an exotic variety of COW?
(a) Plymouth Rock
(b) New Hampshire
(c) Black Rock
(d) Brown Swiss
Answer: (d) Brown SwissIn simple words: Brown Swiss is a well-known exotic breed of dairy cattle, highly valued for its excellent milk production and hardiness.

🎯 Exam Tip: Familiarize yourself with both common Indian and exotic livestock breeds for various agricultural products.

 

Question 18. epithelium is present in the inner surface of respiratory tract.
(a) Stratified
(b) Columnar
(c) Ciliated
(d) Cuboidal
Answer: (c) CiliatedIn simple words: Ciliated epithelium, characterized by hair-like cilia, lines the respiratory tract to trap and move mucus and trapped particles away from the lungs.

🎯 Exam Tip: Recognize ciliated epithelium by its cilia and its primary function of moving substances along a surface, crucial in the respiratory and reproductive tracts.

 

Question 19. Bones consist of osteocytes embedded in solid ground substance made up of
(a) calcium bicarbonate
(b) calcium carbonate
(c) calcium phosphate
(d) calcium sulphate
Answer: (c) calcium phosphateIn simple words: Bones derive their hardness and rigidity from osteocytes embedded within a solid matrix primarily composed of calcium phosphate.

🎯 Exam Tip: Key components of bone are osteocytes and calcium phosphate, which give bone its strength and structure.

 

Question 20. helps in growth of branches, formation of leaves and flowers.
(a) Lateral meristem
(b) Apical meristem
(c) Intercalary meristem
(d) Xylem
Answer: (c) Intercalary meristemIn simple words: Intercalary meristem, located at the base of leaves and internodes, is responsible for the growth of branches, leaves, and flowers, contributing to overall plant development.

🎯 Exam Tip: Differentiate the functions of apical, lateral, and intercalary meristems; intercalary meristem is particularly important for lengthening internodes and leaf growth.

 

Question 21. tissue is present in the hard coat of seeds, outer covering of coconut.
(a) Parenchyma
(b) Xylem
(c) Collenchyma
(d) Sclerenchyma
Answer: (d) SclerenchymaIn simple words: Sclerenchyma tissue, characterized by thick, lignified cell walls, provides structural rigidity and protection, forming the hard coats of seeds and the tough outer covering of coconuts.

🎯 Exam Tip: Sclerenchyma is a permanent tissue known for providing strength and hardness due to its lignified cell walls.

 

Question 22. The cells of tissue are dead.
(a) Parenchyma
(b) Collenchyma
(c) Sclerenchyma
(d) All of these
Answer: (c) SclerenchymaIn simple words: Sclerenchyma cells are dead at maturity, with thick, lignified walls that provide mechanical support to the plant.

🎯 Exam Tip: Remember that sclerenchyma consists of dead cells that primarily function in providing mechanical strength to plant parts.

 

Question 23. Cuboidal epithelium is found in
(a) inner surface of mouth, blood vessels
(b) inner layer of skin
(c) tubules of kidney, salivary gland
(d) inner surface of respiratory tract
Answer: (c) tubules of kidney, salivary glandIn simple words: Cuboidal epithelium, composed of cube-shaped cells, is typically found in structures like kidney tubules and salivary glands, where its functions include secretion, absorption, and protection.

🎯 Exam Tip: Associate cuboidal epithelium with secretory and absorptive functions, commonly found in glands and kidney tubules.

Find the odd man out:

 

Question 1. Cell body, muscle fibre, axon, dendrites.
Answer: Muscle fibre. It is a muscle cell whereas the others are parts of nerve cell.In simple words: Muscle fibre is the odd one out because cell body, axon, and dendrites are all components of a neuron (nerve cell), while muscle fibre is a distinct type of cell involved in contraction.

🎯 Exam Tip: Understand the basic components of a neuron and how they differ from other cell types, such as muscle cells.

 

Question 2. Tracheids, vessels, companion cells, xylem fibres.
Answer: Companion cells. It is an element of phloem whereas the others are elements of xylem.In simple words: Companion cells are unique to phloem, assisting sieve tube elements, while tracheids, vessels, and xylem fibres are all integral components of xylem tissue, involved in water transport.

🎯 Exam Tip: Clearly distinguish between the components of xylem and phloem, understanding their respective roles in plant transport systems.

 

Question 3. Sieve tubes, tracheids, phloem parenchyma, phloem fibres.
Answer: Tracheids. It is an element of xylem whereas the others are elements of phloem.In simple words: Tracheids are part of the xylem tissue, responsible for water conduction, whereas sieve tubes, phloem parenchyma, and phloem fibres are all components of the phloem tissue, involved in food transport.

🎯 Exam Tip: Be able to identify the specific cellular components that make up xylem (water transport) and phloem (food transport) tissues.

 

Question 4. Holstein, Brown swiss, Bombyx mori, Jersey.
Answer: Bombyx mori. It is a variety of silkworm whereas the others are varieties of cows.In simple words: Bombyx mori is the scientific name for the domestic silkworm, used for silk production, making it distinct from Holstein, Brown Swiss, and Jersey, which are all breeds of cows.

🎯 Exam Tip: Categorize organisms and breeds based on their species or agricultural product to correctly identify the odd one out.

Complete the analogy:

 

(1) Inner surface of mouth : Squamous epithelium :: Inner surface of intestine :
Answer: Columnar epitheliumIn simple words: Just as squamous epithelium lines the mouth, columnar epithelium lines the inner surface of the intestine, reflecting their respective functions in protection and absorption.

🎯 Exam Tip: Analogies test your understanding of relationships. Here, the relationship is tissue type to location/function.

 

(2) Glandular epithelium : Secretion of sweat, oil :: Cuboidal epithelium:
Answer: Secretion of salivaIn simple words: Glandular epithelium secretes substances like sweat and oil, while cuboidal epithelium, often found in glands, is responsible for secreting substances like saliva.

🎯 Exam Tip: Relate the function of glandular epithelium (secretion) to the specific secretory role of cuboidal epithelium in glands.

 

(3) Respiratory tract: Ciliated columnar epithelium :: Kidney tubules:
Answer: Cuboidal epitheliumIn simple words: The respiratory tract is lined by ciliated columnar epithelium for moving mucus, similar to how cuboidal epithelium lines kidney tubules for absorption and secretion.

🎯 Exam Tip: Connect specific epithelial types to their characteristic locations and primary functions within the body's organ systems.

 

(4) Outer layer of skin : Stratified epithelium :: Inner layer of skin :
Answer: Glandular epitheliumIn simple words: While the outer skin layer has stratified epithelium for protection, the inner layer contains glandular epithelium responsible for various secretions like sweat and oil.

🎯 Exam Tip: Understand that skin layers have different epithelial types corresponding to their functions: protective on the outside, secretory within.

 

(5) Muscular tissue : Movement :: Nervous tissue :
Answer: Conduction of excitationIn simple words: Muscular tissue is essential for movement, just as nervous tissue is specialized for the conduction of electrical impulses or excitation throughout the body.

🎯 Exam Tip: Clearly link each tissue type to its primary physiological function: muscles for movement, nerves for communication.

 

(6) Tendons : Join muscles to bones :: Ligaments :
Answer: Join two bones to each otherIn simple words: Tendons connect muscles to bones, facilitating movement, whereas ligaments connect bones to other bones, stabilizing joints.

🎯 Exam Tip: This analogy reinforces the distinct roles of tendons (muscle-bone) and ligaments (bone-bone) in the musculoskeletal system.

Match the columns:

 

Question 1.

Column 'A'	Column 'B'
(1) Squamous epithelium	(a) Secretion of digestive juice
(2) Cuboidal epithelium	(b) Selective transport of substances
(3) Columnar epithelium	(c) Protection of organs
(4) Stratified epithelium	(d) Secretion of saliva

Answer:(1 – b), (2 – d), (3 – a), (4 - c)In simple words: This matching exercise correctly links squamous epithelium to selective transport, cuboidal to saliva secretion, columnar to digestive juice secretion, and stratified to organ protection, highlighting their specialized roles.

🎯 Exam Tip: For matching questions, understand the unique structure and primary function of each epithelial tissue type to ensure accurate pairing.

 

Question 2.

Column 'A'	Column 'B'
(1) Brahma	(a) Local variety of cow
(2) Jersey	(b) Layer chicken
(3) Devni	(c) Exotic variety of cow
(4) Lehman	(d) Broiler chicken

Answer:(1 – d), (2 – c), (3 – a), (4 – b)In simple words: This matching correlates Brahma with broiler chicken, Jersey with exotic cow, Devni with local cow, and Lehman with layer chicken, distinguishing between breeds and their uses.

🎯 Exam Tip: Familiarize yourself with common breeds of livestock and poultry, classifying them by type (e.g., local/exotic cow, layer/broiler chicken).

 

Question 3.

Column 'A'	Column 'B'
(1) Potato	(a) Vistive Gold
(2) Maize	(b) Amflora
(3) Soybean	(c) Vaishali
(4) Tomato	(d) MON 863

Answer:(1-b), (2-d), (3-a), (4-c)In simple words: This matching pairs GM varieties with their respective crops: Amflora with potato, MON 863 with maize, Vistive Gold with soybean, and Vaishali with tomato.

🎯 Exam Tip: For biotechnology questions, it's important to remember examples of genetically modified crops and their associated names or identifiers.

Answer the following:

 

Question 1. Explain the different types of muscular tissues.
Answer:

Striated muscles

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र धारीदार मांसपेशियों की कोशिकाओं को दिखाता है, जो लंबी, बेलनाकार, बहु-केंद्रित और शाखाहीन होती हैं। इनमें वैकल्पिक गहरे और हल्के बैंड (धारियाँ) स्पष्ट रूप से दिखाई देते हैं। Muscle cells are long, cylindrical, multinucleate and have no branches.
Structure: There are alternate dark and light bands on these muscles. As they are attached to bones, they are also called skeletal muscles. They move as per our will, hence they are called voluntary muscles.
Function: These muscles bring about movements of arms and legs, running, speaking etc.

Non-Striated muscles

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र अरेखित मांसपेशियों की कोशिकाओं को दर्शाता है, जो छोटी, धुरी के आकार की, एकल-केंद्रित और शाखाहीन होती हैं। इनमें कोई धारियाँ दिखाई नहीं देती हैं। Muscle cells are short, spindle-shaped, uninucleate and have no branches.
Structure: Dark and light bands are absent. Not attached to bones. Their movements are not under the control of our will, hence they are called involuntary muscles. They are present in the alimentary canal, blood vessels, etc.
Function: Movements of eye lids, passage of food through alimentary canal, contraction and relaxation of blood vessels.

Cardiac muscles

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र हृदय की मांसपेशियों की कोशिकाओं को दिखाता है, जो बेलनाकार, एकल-केंद्रित और शाखाओं वाली होती हैं। इनमें भी धारियाँ मौजूद होती हैं और ये अनैच्छिक रूप से काम करती हैं। Muscle cells are cylindrical, uninucleate and branched.
Structure: Dark and light bands are present. The heart is made of these muscles. Their movements are not under the control of our will. They contract and relax rhythmically.
Function: Contraction and relaxation of the heart.In simple words: Muscular tissues are primarily of three types: striated (voluntary, skeletal, banded), non-striated (involuntary, smooth, unbanded), and cardiac (involuntary, heart-specific, branched, banded), each with distinct structures and functions related to movement.

🎯 Exam Tip: When explaining muscular tissues, remember to describe their key characteristics (shape, nucleus, striations, branching) and whether their action is voluntary or involuntary, along with their main locations and functions.

 

Question 2. Explain the types of complex permanent tissues.
Answer:

Name of tissue	Xylem	Phloem
Characteristics	Consists of thick-walled dead cells	Consists of cytoplasm containing living cells.
Types of cells	Tracheids, vessels and xylem fibres - dead cells. Xylem parenchyma – living cells.	Sieve tubes, companion cells, phloem parenchyma - living cells. Phloem fibres – dead cells.
Function	A structure like interconnected tubes, conduct water and minerals only in upward direction.	Tubes joined to each other, conduct sugar and amino acids from leaves to various parts in upward and downward direction

In simple words: Complex permanent tissues in plants are Xylem, which transports water and minerals upwards using dead cells like tracheids and vessels, and Phloem, which transports food (sugars and amino acids) in both directions using living cells like sieve tubes and companion cells.

🎯 Exam Tip: Clearly differentiate between xylem and phloem by their primary function (water vs. food transport), direction of transport, and the types of cells (living or dead) that comprise them.

 

Question 7. Phloem consists of thick-walled dead cells.
Answer: False. Phloem consists of living cells containing cytoplasm.
In simple words: Phloem is a plant tissue responsible for transporting sugars and other nutrients throughout the plant, and its main functional cells are alive, containing cytoplasm.

🎯 Exam Tip: Distinguish carefully between xylem and phloem; xylem (water transport) has many dead cells, while phloem (food transport) is primarily composed of living cells, a frequent point of confusion in exams.

 

Question 8. Stratified squamous epithelium is present in inner surface of mouth, oesophagus, blood vessels and alveoli.
Answer: False. Stratified squamous epithelium is present in the outer layer of skin.
In simple words: Stratified squamous epithelium forms the protective outer layer of the skin, providing multiple layers for protection, while simple squamous epithelium (single layer) lines structures like blood vessels and alveoli.

🎯 Exam Tip: The number of layers (simple vs. stratified) and cell shape (squamous, cuboidal, columnar) are crucial for identifying different epithelial tissues and their locations. Stratified tissues are built for protection in areas subject to wear and tear.

 

Question 9. Broiler chickens are raised for eggs.
Answer: False. Broiler chickens are raised for meat.
In simple words: Broiler chickens are specifically bred and raised for meat production due to their rapid growth and efficient feed conversion, whereas layer chickens are raised for egg production.

🎯 Exam Tip: Understanding the terminology in poultry farming, such as 'broiler' for meat and 'layer' for eggs, is important for questions on animal husbandry and agricultural practices.

 

Question 10. Non-striated muscles bring about contraction and relaxation of heart.
Answer: False. Cardiac muscles bring about contraction and relaxation of heart.
In simple words: The heart's rhythmic pumping is controlled by a specialized type of muscle called cardiac muscle, which is involuntary and unique in its structure, distinct from both non-striated (smooth) and striated (skeletal) muscles found elsewhere in the body.

🎯 Exam Tip: Know the three types of muscle tissue-skeletal (striated, voluntary), smooth (non-striated, involuntary), and cardiac (striated, involuntary)-and their specific functions and locations. Cardiac muscle is unique to the heart.

Name The Following:

 

Question 1. Tissue responsible for growth of branches, formation of leaves and flowers.
Answer: Intercalary meristem.
In simple words: Intercalary meristematic tissue, located at the base of leaves and internodes, is responsible for the growth and development of branches, leaves, and flowers in plants.

🎯 Exam Tip: Identify meristematic tissues by their function: apical meristem for length, lateral meristem for girth, and intercalary meristem for growth in specific regions like nodes and internodes, which contribute to branch and leaf development.

 

Question 2. Tissue that helps in insulation, supply of energy, storage of fats.
Answer: Adipose tissue.
In simple words: Adipose tissue, commonly known as body fat, is a connective tissue specialized in storing fat, which provides energy reserves, insulates the body, and cushions organs.

🎯 Exam Tip: Remember that adipose tissue is a type of connective tissue crucial for energy storage, thermal insulation, and protection of internal organs, making it a vital component in animals.

 

Question 3. Tissue present in outer layer of skin.
Answer: Glandular epithelium.
In simple words: The outer layer of skin is covered by stratified squamous epithelium, which protects the body, but it also contains glandular epithelium in structures like sweat and oil glands that are embedded within it.

🎯 Exam Tip: While stratified squamous epithelium forms the primary protective outer layer of skin, glandular epithelium is also associated with the skin, specialized in secretion functions like sweat and sebum. Be precise about the primary and secondary tissues present.

 

Question 4. Tissue present in nose, ear, larynx, trachea.
Answer: Cartilage.
In simple words: Cartilage is a flexible connective tissue found in various parts of the body such as the nose, ears, larynx, and trachea, providing support, shape, and flexibility without the rigidity of bone.

🎯 Exam Tip: Cartilage is a key connective tissue, distinguished by its flexibility and presence in areas needing both support and movement, contrasting with the hard, rigid structure of bone.

 

Question 5. Dead cells in xylem.
Answer: Tracheids, vessels and xylem fibres.
In simple words: In xylem, which transports water, the primary functional components like tracheids, vessels, and xylem fibers are dead cells with thick walls, forming continuous tubes for efficient water conduction.

🎯 Exam Tip: Understand that xylem tissue is unique because its primary water-conducting cells (tracheids and vessels) are dead, forming a hollow pipeline system. Xylem parenchyma, however, consists of living cells.

 

Question 6. Living cells in xylem.
Answer: Xylem parenchyma.
In simple words: While most of xylem's conducting elements are dead, xylem parenchyma cells are living cells that help in the storage of food and lateral conduction of water.

🎯 Exam Tip: Remember the exception: among the dead elements of xylem, xylem parenchyma stands out as the living component, playing a supportive role in storage and lateral transport.

 

Question 7. Living cells in phloem.
Answer: Sieve tubes, companion cells, phloem parenchyma.
In simple words: Phloem, the food-conducting tissue, primarily consists of living cells such as sieve tubes, companion cells, and phloem parenchyma, all working together to transport sugars.

🎯 Exam Tip: Unlike xylem, the functional components of phloem are predominantly living cells, which is essential for the active transport of food, a key differentiating factor between the two vascular tissues.

 

Question 8. Dead cells in phloem.
Answer: Phloem fibres.
In simple words: Among the predominantly living cells of phloem, phloem fibers are the only dead cells, providing mechanical support to the tissue.

🎯 Exam Tip: Phloem fibers are the exception in phloem tissue, being dead cells that offer structural reinforcement, distinguishing them from the living cells involved in nutrient transport.

 

Question 9. GM crops.
Answer: BT cotton, Amflora, Golden Rice.
In simple words: Genetically Modified (GM) crops are plants whose DNA has been altered using genetic engineering techniques to introduce new traits, such as pest resistance in BT cotton, modified starch in Amflora, or enhanced nutritional value in Golden Rice.

🎯 Exam Tip: When asked for examples of GM crops, recall those with clearly defined engineered traits, like herbicide tolerance, insect resistance (BT cotton), or improved nutrient content (Golden Rice).

 

Question 10. Local Indian varieties of cow.
Answer: Sahiwal, Sindhi, Lai kandhari, Devni, Khillari, Dangi.
In simple words: India has several native breeds of cows, such as Sahiwal, Sindhi, Lai kandhari, Devni, Khillari, and Dangi, which are well-adapted to local conditions and valued for milk production, draught power, or both.

🎯 Exam Tip: For animal husbandry topics, remember common indigenous breeds of livestock and their specific characteristics or uses, as they are often contrasted with exotic varieties.

 

Question 11. Exotic varieties of cow.
Answer: Jersey, Brown swiss, Holstein.
In simple words: Exotic cow breeds like Jersey, Brown Swiss, and Holstein are varieties originating from other regions, often known for their high milk yield and are cross-bred with local varieties to improve productivity.

🎯 Exam Tip: Be able to differentiate between local/indigenous and exotic breeds, especially noting the exotic ones known for high milk production, which are often used in cross-breeding programs.

 

Question 12. Layers.
Answer: Leghorn, Minorca, Ancona, Lehman.
In simple words: 'Layers' refer to breeds of chickens specifically raised for their ability to lay a high number of eggs, such as Leghorn, Minorca, Ancona, and Lehman.

🎯 Exam Tip: In poultry farming, remember the distinction between 'layers' (egg-laying breeds) and 'broilers' (meat-producing breeds) and be familiar with common examples of each.

 

Question 13. Broilers.
Answer: Brahma, Long, Cochin, Aseel.
In simple words: 'Broilers' are chicken breeds, like Brahma, Long, Cochin, and Aseel, that are selectively bred for rapid growth and efficient meat production.

🎯 Exam Tip: Knowing specific broiler breeds is useful when discussing meat production in poultry, complementing the knowledge of layer breeds for egg production.

 

Question 14. Chickens reared for both eggs and meat.
Answer: Rhode Island Red, New Hampshire, Plymouth Rock, Black Rock.
In simple words: Some chicken breeds, such as Rhode Island Red, New Hampshire, Plymouth Rock, and Black Rock, are dual-purpose, meaning they are suitable for both egg production and meat.

🎯 Exam Tip: Recognizing dual-purpose chicken breeds is important as they offer versatility in small-scale farming and are efficient for both egg and meat yield.

Give scientific reason.

 

Question 1. Blood is a complex tissue.
Answer:
• A complex tissue is made up of more than one type of cells.
• In blood, cells of different types, colour and shapes are mixed together.
• Blood contains erythrocytes (RBCs), leucocytes (WBCs) and platelets in a liquid plasma.
• Therefore, blood is a complex tissue.
In simple words: Blood is considered a complex tissue because it consists of various types of cells (red blood cells, white blood cells, platelets) all suspended in a liquid matrix called plasma, each with distinct functions working together.

🎯 Exam Tip: When explaining why blood is a complex tissue, emphasize its multi-cellular composition and the presence of a non-cellular matrix (plasma), highlighting how these diverse components work in concert for its transport and protective functions.

Define the following:

 

Question 1. Tissue
Answer: A group of cells having the same origin, same structure and same function is called tissue.
In simple words: A tissue is a collection of similar cells that come from the same place, look alike, and work together to perform a specific job in an organism.

🎯 Exam Tip: The definition of tissue is fundamental in biology; ensure you include the three key criteria: common origin, similar structure, and shared function for a complete understanding.

 

Question 2. Differentiation
Answer: When cells acquire a specific structure, shape and location and perform a specific function, it is called differentiation.
In simple words: Differentiation is the process where a less specialized cell, like a stem cell, becomes a more specialized cell type, acquiring a distinct shape, structure, and function for a particular role in the body.

🎯 Exam Tip: Differentiation is a core concept in developmental biology; link it to the specialization of cells to perform specific roles, emphasizing the change in structure, shape, and function.

 

Question 3. Biotechnology
Answer: The techniques of bringing about improvements in living organisms by artificial genetic changes and by hybridization for the welfare of human beings, are together called 'Biotechnology'.
In simple words: Biotechnology is the use of living organisms or their components to create or modify products and processes for specific uses, often involving genetic manipulation or hybridization to benefit humans.

🎯 Exam Tip: When defining biotechnology, highlight its core aspects: manipulation of living organisms (or parts) using artificial genetic changes and hybridization, with the ultimate goal of improving human welfare.

 

Question 4. Tissue culture
Answer: Ex vivo growth of cells or tissues in an aseptic and nutrient-rich medium' is called tissue culture.
In simple words: Tissue culture is a method where cells, tissues, or organs are grown outside of their natural environment in a sterile, nutrient-rich liquid or gel, allowing for their multiplication or study under controlled conditions.

🎯 Exam Tip: Focus on the keywords 'ex vivo' (outside the body), 'aseptic' (sterile), and 'nutrient-rich medium' when defining tissue culture, as these are critical conditions for successful cultivation.

Write short notes

 

Question 1. Animal husbandry
Answer:
• In India, animal husbandry is practised for milk production and for using the cattle as help in farming operations.
• Example - Cows and buffaloes are raised for milk and bulls and male buffaloes for pulling the heavy loads.
• Local Indian varieties of cows like Sahiwal, Sindhi, Gir, Lai kandhari, Devni, Khillari, Dangi, etc. and exotic varieties like Jersey, Brown swiss, Holstein, etc. are kept for their milk.
• Proper care of cattle is necessary for a clean and high yield of milk which includes:
(a) A balanced diet, i.e. all constituents of food should be given to cattle. It must include fibre- rich coarse food, fodder, and sufficient water.
(b) The cattle-shed should be clean and dry with proper ventilation and a roof.
(c) Cattle should be regularly vaccinated.
In simple words: Animal husbandry is the scientific management of livestock, including feeding, breeding, housing, and disease control, to improve animal products like milk, eggs, or meat, and to utilize them for farm labor.

🎯 Exam Tip: When writing about animal husbandry, cover its purpose (milk, meat, labor), examples of local and exotic breeds, and the essential management practices like proper diet, housing, and health care.

 

Question 2. Poultry farming.
Answer:
• Rearing of egg and meat yielding chickens is called poultry farming.
• Chickens raised for laying eggs are called layers . e.g. Leghorn, Minorca, Ancona, Lehman.
• Chickens raised for meat are called broilers, e.g. Brahma, Long, Cochin, Aseel.
• Rhode Island Red, New Hampshire, Plymouth Rock, Black Rock are varieties of chicken reared for both eggs as well as meat.
• The objectives behind development of new hybrid varieties from a cross between Indian varieties like Aseel and exotic varieties like Leghorn are to produce good quality chickens in large numbers.
• To develop the ability to withstand high temperature, to use by-products of agriculture as poultry feed, etc.
In simple words: Poultry farming involves raising domesticated birds like chickens, ducks, and turkeys for meat (broilers) or eggs (layers), focusing on improving breeds and providing optimal conditions for high productivity.

🎯 Exam Tip: A comprehensive answer on poultry farming should differentiate between layers and broilers with examples, discuss dual-purpose breeds, and mention the goals of hybrid development, such as improved yield and disease resistance.

Distinguish between:

 

Question 1. Xylem and Phloem
Answer:

Xylem	Phloem
(i) Consists of mostly thick-walled dead cells.	(i) Consists of mostly living cells containing cytoplasm.
(ii) The types of cells include dead cells-tracheids, vessels and xylem fibres and living cells-Xylem parenchyma.	(ii) The types of cells include living cells - Sieve tubes, companion cells, phloem parenchyma and dead cells - phloem fibres.
(iii) Structure like interconnected tubes, conduct water and minerals only in upward direction.	(iii) Tubes joined to each other, conduct sugar and amino acids from leaves to various parts in both upward and downward direction.

In simple words: Xylem primarily transports water and minerals from roots to leaves using mostly dead cells, forming a one-way pipeline, while phloem transports food (sugars) from leaves to all parts of the plant using mostly living cells, allowing two-way movement.

🎯 Exam Tip: For distinguishing xylem and phloem, focus on the primary substance transported, the direction of transport, and the living/dead nature of their constituent cells. Using a table format for your answer can effectively highlight these differences.

 

Question 2. Striated muscles and Non-striated muscles.
Answer:

Striated muscles	Non-striated muscles
(i) Muscle cells are long, cylindrical, multinucleate and have no branches.	(i) Muscle cells are short, spindle-shaped, uninucleate and have no branches.
(ii) There are alternate dark and light bands on these muscles and they are attached to bones.	(ii) Dark and light bands are absent. Not attached to bones.
(iii) They move as per our will, hence they are called voluntary muscles.	(iii) They are not under the control of our will, hence they are called involuntary muscles.
(iv) These muscles bring about movements of arms and legs, running, speaking etc.	(iv) These muscles bring about movement of eyelids, passage of food through alimentary canal, contraction and relaxation of blood vessels etc.

In simple words: Striated muscles are voluntary muscles attached to bones, appearing striped, and responsible for conscious body movements, whereas non-striated (smooth) muscles are involuntary, lack stripes, and control internal organ functions like digestion and blood vessel constriction.

🎯 Exam Tip: When differentiating muscle types, consider their appearance (striated vs. non-striated), control (voluntary vs. involuntary), location (skeletal vs. internal organs), and specific functions. A table format is ideal for clearly presenting these distinctions.

 

Question 3. Cartilage and Bone
Answer:

Cartilage	Bone
(i) They are present in nose, ear, larynx, trachea.	(i) They form the skeleton of the body.
(ii) They contain cells supported by fibrous, flexible, jelly-like ground substance.	(ii) They contain osteocytes embedded in solid ground substance made up of calcium phosphate.
(iii) Lubricates the surface of bones, gives support and shape to organs.	(iii) Supports and protects different organs, helps in movement.

In simple words: Cartilage is a flexible, smooth connective tissue found in areas like the nose and ears, providing support and reducing friction, while bone is a hard, rigid connective tissue that forms the body's skeleton, providing strong support, protection, and aiding movement.

🎯 Exam Tip: Focus on the rigidity, composition (calcium phosphate in bone vs. flexible matrix in cartilage), and primary functions (structural support and protection by bone vs. flexible support and friction reduction by cartilage) to distinguish between these two connective tissues.

Answer the following questions:

 

Question 1. Close your eyes and try to identify different objects by feeling them with your hand. Why is it possible for you to identify things like a note-book, text-book, bench, compass-box, etc. only by touching them?
Answer:
• We can identify objects just by touching them because of the memory that we retain in our brain.
• The nervous tissue enables us to respond to the stimuli of touch.
In simple words: We can identify objects by touch because our sense of touch, facilitated by specialized nervous tissues in our skin, sends signals to the brain, which then matches these sensations with stored memories of textures, shapes, and sizes.

🎯 Exam Tip: When explaining sensory perception like touch, highlight the role of nervous tissue in detecting stimuli and the brain's function in interpreting and recalling information based on those sensations.

Answer in detail:

 

Question 1. Write the location, structure and function of following epithelial tissues:
(a) Squamous epithelium
(b) Stratified epithelium
(c) Glandular epithelium
(d) Columnar epithelium
(e) Ciliated epithelium
(f) Cuboidal epithelium
Answer:

ℹ️ चित्र व्याख्या (Diagram Explanation): यह तालिका विभिन्न प्रकार के उपकला ऊतकों (epithelial tissues) को उनके नाम, आरेखीय उपस्थिति, स्थान, संरचना और कार्यों के साथ दर्शाती है। इसमें स्क्वैमस, स्तरीकृत (stratified), ग्रंथीय (glandular), स्तंभी (columnar), सिलिअटेड (ciliated) और घनाकार (cuboidal) उपकला ऊतक शामिल हैं, जो शरीर के विभिन्न हिस्सों में पाए जाते हैं और विशिष्ट कार्य करते हैं।

Name	Appearance (diagrammatic)	Location	Sturcture	Function
Squamous epithelium		Inner surface of mouth, oesophagus, blood-vessels, alveoli	Thin, small, flat cells form semipermeable membrane.	Selective transport of substances.
Stratified epithelium		Outer layer of skin	Many layers of cells	Prevention of wearing of organs, protection of organs.
Glandular epithelium		Inner layer of skin, etc.	Cells contain vesicles packed with secretory material	Secretion of sweat, oil (sebum), mucus, etc.
Columnar epithelium		Inner surface (mucosa) of intestine, alimentary canal	Column-like tall cells. Upper free surface bears folds made of these cells at places of absorption	Secretion of digestive juice, absorption of nutrients
Ciliated Epithelium		Inner surface of respiratory tract	Upper free surface of cells bears minute hair-like processes	Push mucus and air forward to keep the air passage free
Cuboidal epithelium		Tubules of kidney (nephron), salivary gland	Cells are cuboidal	Reabsorption of useful materials from urine, secretion of saliva

In simple words: Epithelial tissues are protective coverings that line body surfaces and cavities, with different types like squamous (flat), cuboidal (cube-shaped), and columnar (column-shaped) each specialized for functions such as protection, secretion, absorption, or filtration, found in various organs depending on their role.

🎯 Exam Tip: When describing epithelial tissues, always include their specific location, unique structural features (cell shape, layers, specializations like cilia), and their corresponding functions, as these elements are crucial for a complete answer.

 

Question 2. Write the structure and function of the following connective tissues:
(a) Blood
(b) Lymph
(c) Areolar tissue
(d) Adipose tissue
(e) Cartilage
(f) Bones
(g) Tendons and ligaments
Answer:

ℹ️ चित्र व्याख्या (Diagram Explanation): यह तालिका विभिन्न प्रकार के संयोजी ऊतकों (connective tissues) को उनकी उपस्थिति (आरेखीय), स्थान, संरचना और कार्यों के साथ दर्शाती है। इसमें रक्त, लसीका (lymph), एरियोलर ऊतक, वसा ऊतक (adipose tissue), उपास्थि (cartilage), हड्डियाँ (bones), और कण्डरा एवं स्नायु (tendons and ligaments) शामिल हैं, जो शरीर में विभिन्न सहायक, परिवहन और संरचनात्मक भूमिकाएँ निभाते हैं।

Type	Appearance (diagrammatic)	Location	Structure	Function
Blood		Closed circulatory system	Erythrocytes, leucocytes and platelets in a liquid plasma	Transport of oxygen nutrients, hormones and waste.
Lymph		All around the cells in the body.	Fluid oozed out of blood capillaries, contains leucocytes and liquid ground substance	Protection of body from infections.
Areolar Tissue		Between the skin and muscles, around blood vessels	Different types of cells loosely arran-ged and supported by a jelly-like ground substance and elastic fibres	Supports internal organs
Adipose Tissue		Below the skin and around internal organs.	Cells filled with fat droplets, jelly-like ground substance	Insulation, supply of energy, storage of fats
Cartilage		Nose, ear, larynx, trachea	Cells supported by fibrous, flexible Jelly-like ground substance	Lubricates the surfaces of bones, gives support and shape to organs
Bones		Skeleton (A specific structure extending throughout the body	Osteocytes embedded in solid ground substance made up of calcium phosphate	Supports and protects different organs, helps in movement
Tendons and liga-ments		At the joints	Tendons: fibrous, strong, less elastic Ligaments: strong and highly flexible	Tendons: join muscles to bones Ligaments: join two bones to each other

In simple words: Connective tissues like blood, lymph, areolar, adipose, cartilage, bone, tendons, and ligaments provide support, connect other tissues, store fat, protect organs, and transport substances throughout the body, each having unique structures and functions.

🎯 Exam Tip: When describing connective tissues, categorize them by their main components (cells, fibers, ground substance) and their primary role (e.g., transport for blood, support for bone, flexibility for cartilage, connection for tendons/ligaments), ensuring you list their specific locations and functions for each type.

 

Question 2. Describe the structure of nervous tissue with the help of a neat labelled diagram.
Answer:
• Nervous tissue enables us to respond to stimuli like touch, sound, odour, colour, etc.
• Cells of the nervous tissue are specifically made to become excited and conduct the excitation from one part of the body to another.
• The main part of the nerve cell is the cell body which contains the cytoplasm and the nucleus.
• Numerous, small, branched fibres called dendrites arise from the cell body.
• One of the fibres, is extremely long and is called the axon.
• The length of the nerve cell may be up to one metre.
• Many nerve cells are bound together with the help of connective tissue to form a nerve.
• Nervous tissue is present in the brain, spinal cord and the network of nerves spread all throughout the body.
• In most animals, action in response to a stimulus occurs due to the integrated functioning of the nervous tissue and muscular tissue.
ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र प्याज की जड़ों में होने वाले परिवर्तनों को दर्शाता है। एक जार (A) में, जड़ें पानी में डुबोई गई हैं और बढ़ती रहती हैं, जबकि दूसरे जार (B) में, जड़ों के सिरे काट दिए गए हैं, जिससे उनकी वृद्धि रुक जाती है। यह मेरिस्टेमेटिक ऊतक की उपस्थिति और कार्य को स्पष्ट करता है।
In simple words: Nervous tissue is made of specialized cells called neurons, which have a cell body, branching dendrites to receive signals, and a long axon to transmit signals, allowing rapid communication throughout the body for perceiving stimuli and coordinating responses.

🎯 Exam Tip: When describing nervous tissue, focus on the neuron's key parts (cell body, dendrites, axon) and their roles in receiving, processing, and transmitting electrical signals. Emphasize its function in coordinating body responses and its widespread presence in the nervous system.

 

Question 3. Explain the types of simple permanent tissues in plants.
Answer: Types of simple permanent tissues.
In simple words: Simple permanent tissues in plants are made of only one type of cells that have lost the ability to divide and are specialized for functions like storage, support, or protection, including parenchyma, collenchyma, and sclerenchyma.

🎯 Exam Tip: When asked to explain simple permanent tissues, ensure you list and briefly describe the three main types: parenchyma (storage, photosynthesis), collenchyma (flexible support), and sclerenchyma (rigid support), highlighting their distinct cell characteristics and functions.

 

Question 4. Explain types, location and function of Meristematic tissue in tabular form:
Answer:

Types	Apical	Intercalary	Lateral
Location	At tip of the root and stem	At the base of the petiole of leaves and branches	At sides of root and stem
Function	Increase the length of the root and stem	Growth of branches, the formation of leaves and flowers	Increases diameter of the root and stem

In simple words: Meristematic tissues are plant growth tissues with actively dividing cells, categorized into apical (for length at tips), intercalary (for growth at nodes and leaf bases), and lateral (for girth increase) meristems, each contributing to different aspects of plant development.

🎯 Exam Tip: When detailing meristematic tissues, a table is excellent for clearly presenting the three types-apical, intercalary, and lateral-along with their specific locations and roles in primary and secondary plant growth.

 

Question 5. Explain the types of simple permanent tissues in plants.
Answer: Types of simple permanent tissues.

Name of Tissue	Parenchyma	Collenchyma	Sclerenchyma
Structure of cells	Living cells with thin cell wall and intercellular spaces.	Elongated living cells with thickened cell wall at corners due to cellulose and pectin.	Dead and fibrous cells with tapering ends, cell wall contains lignin.
Location	All parts like roots, stem, leaves, flowers and seeds.	At the base of leaf petiole, branches and stem	Stem, veins of leaves, hard coats of seeds, outer covering of coconut.
Functions	Support, storage of food and filling vacant spaces.	Support and flexibility to various parts.	Give strength and rigidity to parts of the plants.
Sub types	Chlorenchyma: Leaves, perform photosynthesis. Aerenchyma: Helps aquatic plants, leaves and stem to float.

In simple words: Simple permanent tissues, which are non-dividing and specialized, include parenchyma (for storage, photosynthesis, buoyancy), collenchyma (for flexible support in growing parts), and sclerenchyma (for rigid, strong support in mature parts).

🎯 Exam Tip: When discussing simple permanent tissues, organize your answer by type (parenchyma, collenchyma, sclerenchyma), clearly stating their cell characteristics (living/dead, wall thickness), typical locations, and primary functions to demonstrate a comprehensive understanding.

 

Question 6. Write down the applications of biotechnology (tissue culture) in floriculture, nurseries and forestry.
Answer: Applications of biotechnology (tissue culture) in floriculture, nurseries and foresty:
• Tissue culture can be used to grow those plants on a large scale which bear flowers, fruits of excellent quality.
• Fully grown plants can be produced in shorter durations.
• Plants can be grown on a large scale even if means of pollination or germinating seeds are not available.
• For example, orchids or pitcher plants do not germinate but these plants can easily be produced by means of tissue culture.
• In a bioreactor, cells can be grown in a more nutritive medium and protected from pathogens.
• Bioreactors are useful for producing plantlets on a very large scale.
• A large number of seedlings/plantlets can be produced in a short time using minimum resources and materials.
• Usually, plants produced by tissue culture and genetic modification techniques are disease-free.
• Plantlets produced by tissue culture technique of the meristem are virus-free.
• Embryos produced using conventional hybridization technique between two or more varieties may not grow fully for some reasons.
• However, embryos produced by tissue culture technique always complete their growth.
• Rare and endangered plants can be grown using tissue culture technique and can thus be protected from extinction.
• Similarly, various parts and seeds of such plants can be preserved by tissue culture and those varieties can be protected.
In simple words: Tissue culture, a biotechnology technique, is widely used in floriculture, nurseries, and forestry to rapidly produce large numbers of high-quality, disease-free plants, including difficult-to-germinate species, and to conserve rare or endangered plant varieties.

🎯 Exam Tip: When outlining applications of tissue culture, emphasize its benefits like mass propagation, production of disease-free plants, faster maturity, cultivation of difficult species, and conservation of rare plants, making sure to relate these to floriculture, nurseries, and forestry.

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