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Tissues in Action

Chapter 3. Tissues in Action

Cells are the basic units of life, but in multicellular organisms, similar cells work together to perform specific functions. Such groups of similar cells form tissues. Different tissues combine to form organs, organ systems and finally a complete organism. This chapter explains the organisation of plant and animal tissues, their structure, functions and importance in maintaining life processes.

Chapter Overview

• Hierarchy of Organisation – Cells combine to form tissues, tissues form organs, organs form organ systems, and organ systems together form an organism.
• Tissues – A tissue is a group of similar cells that work together to perform a specific function.
• Division of Labour – Different tissues perform specialised functions, making the body more efficient.
• Plant and Animal Tissues – Plants and animals possess different tissues because their lifestyles and functions are different.
• Meristematic Tissue – These are actively dividing tissues responsible for the growth of plants.
• Types of Meristematic Tissue – Apical, lateral and intercalary meristems help plants grow in length, girth and regeneration.
• Permanent Tissue – Formed when meristematic cells lose the ability to divide and become specialised.
• Simple Permanent Tissue – Parenchyma, collenchyma and sclerenchyma provide storage, flexibility and mechanical support.
• Complex Permanent Tissue – Xylem transports water and minerals, while phloem transports food throughout the plant.
• Tissue Systems – Dermal, ground and vascular tissue systems work together to protect, support and conduct materials in plants.
• Animal Tissues – Animal tissues are classified into epithelial, connective, muscular and nervous tissues.
• Epithelial Tissue – Covers body surfaces, protects organs and performs absorption, secretion and exchange.
• Connective Tissue – Supports, connects and protects body parts. Blood, bone, cartilage, tendon and ligament are its major types.
• Muscular Tissue – Responsible for movement and includes skeletal, smooth and cardiac muscles.
• Nervous Tissue – Receives, processes and transmits nerve impulses through neurons.
• Musculoskeletal System – Bones, muscles, tendons, ligaments and joints work together to provide movement and support.

Key Terms to Remember

Term	Meaning
Tissue	Group of similar cells performing a specific function.
Meristematic Tissue	Actively dividing tissue responsible for plant growth.
Permanent Tissue	Specialised tissue formed after differentiation.
Xylem	Conducts water and minerals.
Phloem	Conducts prepared food.
Epithelial Tissue	Protective covering of the body and organs.
Connective Tissue	Supports and connects body parts.
Muscular Tissue	Produces movement.
Nervous Tissue	Controls coordination and communication.
Neuron	Structural and functional unit of the nervous system.

Learning Outcomes

• Understand the organisation of cells into tissues and organs.
• Differentiate between plant tissues and animal tissues.
• Explain the structure, location and functions of different plant tissues.
• Describe the characteristics and functions of animal tissues.
• Understand the role of tissue systems in plants.
• Relate the structure of tissues with their specialised functions.
• Explain how muscles, bones and nerves work together for movement.
• Apply the concept of tissues to daily life and biological processes.

Why This Chapter is Important

• Forms the foundation for higher studies in Plant Physiology and Human Physiology.
• Frequently tested in CBSE Board examinations through competency-based and case-study questions.
• Helps understand growth, repair, movement and coordination in living organisms.
• Builds the basic concepts required for Genetics, Biotechnology and Medical Science.

ATP Education Quick Revision

• Cells → Tissues → Organs → Organ Systems → Organism
• Plant Tissues → Meristematic and Permanent Tissues.
• Permanent Tissues → Simple and Complex.
• Animal Tissues → Epithelial, Connective, Muscular and Nervous.
• Xylem → Water Transport.
• Phloem → Food Transport.
• Neuron → Carries Nerve Impulses.
• Skeletal Muscle → Voluntary Movement.
• Smooth Muscle → Involuntary Movement.
• Cardiac Muscle → Heartbeat.

ATP Education Exam Tip: Focus on the differences between plant and animal tissues, meristematic and permanent tissues, xylem and phloem, epithelial and connective tissues, and the characteristics of skeletal, smooth and cardiac muscles. These concepts are highly important for objective, competency-based and descriptive questions. The chapter emphasizes that specialised tissues perform specialised functions, making multicellular organisms more efficient. :contentReference[oaicite:0]{index=0}

Tissues in Action

Chapter 3. Tissues in Action

This section explains why tissues are needed in multicellular organisms, the concept of division of labour, and the different types of plant tissues. It also introduces meristematic tissues, which are responsible for the growth of plants.

1. What is a Tissue?

In multicellular organisms, millions of cells perform different activities. Cells that have a similar structure and perform the same function group together to form a tissue. This organisation increases the efficiency of the organism.

Definition

A tissue is a group of similar cells having a common origin that work together to perform a specific function.

Characteristics of Tissues

• Similar Cells – Cells in a tissue have a similar structure and function.
• Common Function – All cells work together to perform one specific activity.
• Division of Labour – Different tissues perform different specialised functions.
• Higher Efficiency – Specialisation makes multicellular organisms more efficient.

Importance of Tissues

• Efficient Body Functions – Different tissues perform different tasks simultaneously.
• Growth and Repair – Help in growth, healing and replacement of damaged cells.
• Better Coordination – Different tissues coordinate to keep the organism alive.
• Formation of Organs – Tissues combine to form organs and organ systems.

2. Levels of Organisation

Living organisms are organised in different levels. Similar cells form tissues, tissues form organs, organs work together as organ systems, and organ systems together make a complete organism.

Organisation Sequence

Cell → Tissue → Organ → Organ System → Organism

Example

• Muscle Cell → Muscle Tissue
• Muscle Tissue → Heart
• Heart → Circulatory System
• Circulatory System → Human Body

3. Difference Between Plant and Animal Tissues

Plants and animals have different lifestyles. Plants remain fixed at one place, whereas animals move from one place to another. Therefore, their tissues differ in structure and function.

Plant Tissues	Animal Tissues
Growth is limited to specific regions.	Growth occurs throughout the body.
Many tissues provide mechanical support.	Many tissues help in movement.
Cells usually have a cell wall.	Cells do not have a cell wall.
Less energy is required.	More energy is required due to movement.
Examples: Xylem, Phloem.	Examples: Muscle, Nerve.

4. Plant Tissues

Plant tissues are groups of similar cells that perform specific functions such as growth, support, storage and transport of water and food.

Classification of Plant Tissues

• Meristematic Tissue – Responsible for the growth of plants.
• Permanent Tissue – Performs specialised functions after growth.

5. Meristematic Tissue

Meristematic tissues consist of actively dividing cells. These tissues are found in growing regions of plants and are responsible for increasing the length and thickness of the plant.

Definition

Meristematic tissue is a tissue made up of actively dividing cells that help plants grow.

Characteristics

• Actively Dividing Cells – Cells divide continuously.
• Thin Cell Wall – Primary cell wall is thin.
• Dense Cytoplasm – Cytoplasm is dense with a prominent nucleus.
• No Intercellular Spaces – Cells are tightly packed together.
• Small Vacuoles – Vacuoles are absent or very small.

Functions

• Plant Growth – Increases the size of the plant.
• Formation of New Cells – Produces permanent tissues.
• Healing – Helps repair damaged plant parts.

6. Types of Meristematic Tissue

Meristematic tissues are classified according to their location in the plant body.

Apical Meristem

• Location – Present at the tips of roots and shoots.
• Function – Increases the length of the plant (primary growth).

Intercalary Meristem

• Location – Present at the base of leaves or internodes.
• Function – Helps in rapid growth and regeneration, especially in grasses.

Lateral Meristem

• Location – Present along the sides of stems and roots.
• Function – Increases the thickness (secondary growth) of the plant.

Difference Between Types of Meristem

Type	Location	Function
Apical	Root and shoot tips	Increase in length
Intercalary	Leaf base and internodes	Rapid growth and regeneration
Lateral	Sides of stems and roots	Increase in thickness

7. Differentiation

As plants grow, meristematic cells gradually lose their ability to divide and become specialised for different functions. This process is known as differentiation.

Definition

Differentiation is the process by which meristematic cells become permanent tissues with specialised functions.

Importance

• Formation of Permanent Tissues – Produces specialised tissues.
• Division of Labour – Different tissues perform different functions.
• Efficient Plant Body – Helps plants carry out various life processes efficiently.

ATP Education Tip

Remember this sequence for examinations: Meristematic Tissue → Differentiation → Permanent Tissue. Also remember that Apical Meristem increases length, Lateral Meristem increases thickness, and Intercalary Meristem helps in rapid growth of grasses. These concepts are frequently asked in CBSE objective, competency-based and descriptive questions.

Tissues in Action

Chapter 3. Tissues in Action

This section explains permanent tissues found in plants. After completing growth, meristematic cells undergo differentiation and become permanent tissues. These tissues perform specialised functions such as storage, photosynthesis, protection and transportation.

8. Permanent Tissue

Meristematic cells divide continuously, but after a certain stage they lose the ability to divide and become specialised. These specialised tissues are known as permanent tissues.

Definition

Permanent tissue is a tissue formed from meristematic tissue after differentiation. Its cells lose the power of division and perform specific functions.

Characteristics

• Mature Cells – Cells are fully developed.
• No Cell Division – Cells generally do not divide.
• Large Vacuoles – Vacuoles are well developed.
• Specialised Functions – Each tissue performs a particular function.

Classification of Permanent Tissue

• Simple Permanent Tissue – Made up of only one type of cells.
• Complex Permanent Tissue – Made up of more than one type of cells working together.

9. Simple Permanent Tissue

Simple permanent tissues consist of similar cells performing the same function. They mainly provide storage, support and protection to plants.

Types of Simple Permanent Tissue

• Parenchyma
• Collenchyma
• Sclerenchyma

10. Parenchyma

Parenchyma is the most common living tissue in plants. It is found in leaves, stems, roots and fruits. These cells mainly store food and water.

Definition

Parenchyma is a simple permanent living tissue made up of thin-walled cells.

Characteristics

• Living Cells – Cells remain alive.
• Thin Cell Wall – Made of cellulose.
• Large Vacuole – Stores water and nutrients.
• Intercellular Spaces – Spaces are present between neighbouring cells.

Functions

• Storage – Stores food and water.
• Photosynthesis – Chlorenchyma contains chlorophyll and prepares food.
• Buoyancy – Aerenchyma helps aquatic plants float.
• Healing – Helps repair injured plant parts.

Types of Parenchyma

• Chlorenchyma – Contains chlorophyll and performs photosynthesis.
• Aerenchyma – Contains large air spaces that help aquatic plants float.

11. Collenchyma

Collenchyma provides flexibility and mechanical support to young stems and leaves. It allows plants to bend without breaking.

Definition

Collenchyma is a simple permanent living tissue that provides mechanical support and flexibility.

Characteristics

• Living Cells – Cells remain alive.
• Unevenly Thickened Walls – Cell corners are thickened.
• Flexible Tissue – Allows bending without breaking.
• Little Intercellular Space – Cells remain closely packed.

Functions

• Mechanical Support – Supports growing plant parts.
• Flexibility – Prevents stems and leaves from breaking.
• Protection – Strengthens young tissues.

12. Sclerenchyma

Sclerenchyma is a dead tissue that provides maximum strength and rigidity to mature plant parts.

Definition

Sclerenchyma is a simple permanent dead tissue with thick, lignified cell walls.

Characteristics

• Dead Cells – Cells lose their living contents at maturity.
• Very Thick Walls – Cell walls contain lignin.
• No Intercellular Spaces – Cells remain tightly packed.
• Hard Tissue – Provides great mechanical strength.

Functions

• Mechanical Strength – Makes plant parts hard and strong.
• Protection – Protects seeds and fruits.
• Support – Helps plants remain upright.

13. Comparison of Simple Permanent Tissues

Feature	Parenchyma	Collenchyma	Sclerenchyma
Nature	Living	Living	Dead
Cell Wall	Thin	Unevenly Thickened	Very Thick and Lignified
Intercellular Space	Present	Very Little	Absent
Main Function	Storage	Support & Flexibility	Strength & Protection
Example	Fruit Pulp	Leaf Stalk	Coconut Husk

14. ATP Education Concept Builder

Easy Memory Trick

• Parenchyma → Packing & Storage Tissue.
• Collenchyma → Flexible Support Tissue.
• Sclerenchyma → Strong Mechanical Tissue.

ATP Education Tip

CBSE frequently asks students to compare Parenchyma, Collenchyma and Sclerenchyma. Remember that Parenchyma stores food, Collenchyma provides flexibility, and Sclerenchyma provides maximum strength. This comparison is important for objective, competency-based and descriptive questions.

Tissues in Action

Chapter 3. Tissues in Action

This section explains the complex permanent tissues of plants and the different types of animal tissues. It also describes how these tissues help in transport, protection, support, movement and coordination in living organisms.

15. Complex Permanent Tissue

Complex permanent tissues are made up of more than one type of cells. All these cells work together to perform a common function, mainly the transportation of water, minerals and food throughout the plant.

Definition

Complex permanent tissue is a tissue composed of different kinds of cells working together to perform a specific function.

Types of Complex Permanent Tissue

• Xylem – Transports water and minerals from the roots to different parts of the plant.
• Phloem – Transports prepared food from leaves to all parts of the plant.

16. Xylem

Xylem is the conducting tissue responsible for carrying water and dissolved minerals from the roots to the stem, leaves and other plant parts.

Definition

Xylem is a complex permanent tissue that transports water and minerals upward in the plant.

Components of Xylem

• Tracheids – Conduct water and provide support.
• Vessels – Main conducting elements in flowering plants.
• Xylem Fibres – Provide mechanical strength.
• Xylem Parenchyma – Stores food and helps in lateral transport.

Functions

• Transport of Water – Carries water from roots to leaves.
• Transport of Minerals – Supplies essential minerals throughout the plant.
• Mechanical Support – Makes the plant strong and upright.

17. Phloem

Phloem transports the food prepared in the leaves to all growing and storage regions of the plant.

Definition

Phloem is a complex permanent tissue responsible for transporting food in plants.

Components of Phloem

• Sieve Tubes – Main food-conducting cells.
• Companion Cells – Help sieve tubes in food transport.
• Phloem Parenchyma – Stores food.
• Phloem Fibres – Provide mechanical support.

Functions

• Food Transport – Carries prepared food to different plant parts.
• Storage – Stores food materials.
• Support – Strengthens plant tissues.

18. Difference Between Xylem and Phloem

Xylem	Phloem
Transports water and minerals.	Transports prepared food.
Mainly upward movement.	Transport may occur in both directions.
Mostly dead cells.	Mostly living cells.
Provides mechanical support.	Mainly transports food.

19. Animal Tissues

Animal tissues are specialised groups of cells that perform different functions such as protection, support, movement and coordination. Unlike plants, animals require tissues that help them move and respond quickly to their surroundings.

Classification of Animal Tissues

• Epithelial Tissue
• Connective Tissue
• Muscular Tissue
• Nervous Tissue

20. Epithelial Tissue

Epithelial tissue forms the protective covering of the body and lines internal organs and cavities. It protects the body from injury, infection and dehydration.

Definition

Epithelial tissue is a protective tissue that covers body surfaces and lines internal organs.

Functions

• Protection – Protects internal organs.
• Absorption – Absorbs nutrients in the intestine.
• Secretion – Forms glands that produce useful substances.
• Exchange of Materials – Helps in the exchange of gases in the lungs.

21. Connective Tissue

Connective tissue connects, supports and protects different parts of the body. It is the most abundant tissue in animals.

Definition

Connective tissue is a tissue that binds, supports and connects different organs and tissues.

Types of Connective Tissue

• Blood – Transports oxygen, nutrients and waste materials.
• Bone – Provides support and protects internal organs.
• Cartilage – Provides flexibility at joints.
• Tendon – Connects muscles to bones.
• Ligament – Connects one bone to another bone.

22. Muscular Tissue

Muscular tissue is responsible for all types of body movements. Muscle cells contract and relax to produce movement.

Types of Muscular Tissue

• Skeletal Muscle – Voluntary muscles attached to bones.
• Smooth Muscle – Involuntary muscles found in internal organs.
• Cardiac Muscle – Special involuntary muscle found only in the heart.

Muscle Type	Control	Location
Skeletal Muscle	Voluntary	Attached to bones
Smooth Muscle	Involuntary	Walls of internal organs
Cardiac Muscle	Involuntary	Heart

23. Nervous Tissue

Nervous tissue helps the body receive, process and respond to different stimuli. It controls coordination between different organs.

Definition

Nervous tissue is a specialised tissue responsible for transmitting nerve impulses.

Neuron

A neuron is the structural and functional unit of the nervous system.

Functions

• Receives Stimuli – Detects changes in the surroundings.
• Transmits Nerve Impulses – Carries messages between different body parts.
• Controls Coordination – Helps different organs work together.

24. ATP Education Quick Comparison

Plant Tissue	Main Function
Meristematic	Growth
Parenchyma	Storage
Collenchyma	Flexibility
Sclerenchyma	Mechanical Strength
Xylem	Water Transport
Phloem	Food Transport

ATP Education Tip

For CBSE examinations, remember these high-scoring concepts: Xylem transports water, Phloem transports food, Tendon connects muscle to bone, Ligament connects bone to bone, Blood is a connective tissue, and Neuron is the structural and functional unit of the nervous system. These topics are frequently asked in objective, competency-based and case-study questions.

Tissues in Action

Chapter 3. Tissues in Action

This section completes the chapter by explaining how different tissues work together in plants and animals. It also includes important comparison tables, real-life applications, exam tips and quick revision points for CBSE examinations.

25. How Tissues Work Together

No tissue works independently in a multicellular organism. Different tissues coordinate with one another to perform complex life processes such as transport, growth, movement, protection and reproduction.

In Plants

• Meristematic Tissue – Produces new cells for growth.
• Parenchyma – Stores food and performs photosynthesis.
• Collenchyma – Provides flexibility to young stems and leaves.
• Sclerenchyma – Gives mechanical strength to mature plant parts.
• Xylem – Carries water and minerals from roots to leaves.
• Phloem – Transports prepared food to all parts of the plant.

In Animals

• Epithelial Tissue – Protects body surfaces and internal organs.
• Connective Tissue – Connects, supports and protects body parts.
• Muscular Tissue – Produces movement.
• Nervous Tissue – Controls coordination and responses.

26. Real-Life Applications of Tissues

The study of tissues is not limited to textbooks. It has several practical applications in medicine, agriculture and biotechnology.

Applications in Daily Life

• Bone Fracture Treatment – Knowledge of bone tissue helps doctors repair fractures.
• Blood Donation – Blood, a connective tissue, saves countless lives.
• Plant Grafting – Meristematic tissues help plants regenerate after grafting.
• Crop Improvement – Tissue culture is used to produce disease-free plants.
• Sports Medicine – Tendons and ligaments are treated to restore movement after injuries.

27. Frequently Confused Terms

Term	Difference
Meristematic Tissue	Actively dividing tissue responsible for growth.
Permanent Tissue	Specialised tissue that has lost the power of division.
Xylem	Transports water and minerals.
Phloem	Transports prepared food.
Tendon	Connects muscle to bone.
Ligament	Connects bone to bone.
Skeletal Muscle	Voluntary muscle attached to bones.
Cardiac Muscle	Involuntary muscle found only in the heart.

28. Important Differences

Meristematic Tissue vs Permanent Tissue

Meristematic Tissue	Permanent Tissue
Cells divide continuously.	Cells do not divide.
Responsible for growth.	Performs specialised functions.
Small vacuoles.	Large vacuoles.
No intercellular spaces.	Intercellular spaces may be present.

Tendon vs Ligament

Tendon	Ligament
Connects muscle to bone.	Connects bone to bone.
Less elastic.	More elastic.
Provides stability during movement.	Stabilises joints.

29. Memory Tricks

• P → Parenchyma → Packing & Storage
• C → Collenchyma → Curved Stem (Flexibility)
• S → Sclerenchyma → Strength
• X → Xylem → Water "X" Moves Upward
• P → Phloem → Prepared Food
• T → Tendon → To Muscle
• L → Ligament → Links Bones

30. Flow Chart

Cell → Tissue → Organ → Organ System → Organism

Meristematic Tissue → Differentiation → Permanent Tissue → Simple & Complex Permanent Tissue

Animal Tissues → Epithelial → Connective → Muscular → Nervous

31. One-Day Before Exam Revision

• Tissue – Group of similar cells performing the same function.
• Meristematic Tissue – Responsible for plant growth.
• Parenchyma – Storage and photosynthesis.
• Collenchyma – Flexibility and support.
• Sclerenchyma – Mechanical strength.
• Xylem – Water and mineral transport.
• Phloem – Food transport.
• Epithelial Tissue – Protection.
• Connective Tissue – Support and connection.
• Blood – Fluid connective tissue.
• Bone – Hard connective tissue.
• Cartilage – Flexible connective tissue.
• Skeletal Muscle – Voluntary movement.
• Smooth Muscle – Involuntary movement.
• Cardiac Muscle – Heart muscle.
• Neuron – Structural and functional unit of the nervous system.

32. ATP Education Chapter Summary

Multicellular organisms become efficient because similar cells perform specialised functions by forming tissues. In plants, tissues help in growth, storage, protection and transport, whereas in animals they provide protection, support, movement and coordination. Understanding tissues helps explain how complex organisms survive, grow and respond to their environment.

ATP Education Exam Booster

• Remember the four animal tissues: Epithelial, Connective, Muscular and Nervous.
• Remember the two complex plant tissues: Xylem and Phloem.
• Know all comparison tables because CBSE frequently asks competency-based questions from them.
• Learn the functions of every tissue instead of only memorising names.
• Practice labelled diagrams of neuron, xylem, phloem and different muscle tissues for better board exam preparation.

Tissues in Action

Chapter 3. Tissues in Action

This assignment is based on the complete chapter and follows the latest CBSE competency-based pattern. It is designed to improve conceptual understanding, analytical ability and exam preparation.

Chapter Assignment

1. One Word Answer

1. A group of similar cells performing the same function.
2. Plant tissue responsible for growth.
3. Meristem present at the tip of roots and shoots.
4. Tissue that transports water and minerals.
5. Tissue that transports prepared food.
6. The living simple permanent tissue that stores food.
7. The dead tissue that provides mechanical strength.
8. The connective tissue that joins muscles to bones.
9. The connective tissue that joins one bone to another.
10. The structural and functional unit of the nervous system.

2. Fill in the Blanks

1. A tissue is a group of __________ cells.
2. Meristematic tissue is responsible for __________.
3. Parenchyma mainly stores __________.
4. Collenchyma provides __________ to plants.
5. Sclerenchyma cells are __________ at maturity.
6. Xylem transports __________ and minerals.
7. Phloem transports prepared __________.
8. Blood is a __________ tissue.
9. Cardiac muscles are found only in the __________.
10. Nerve impulses are transmitted by __________.

3. True or False

1. Meristematic cells divide continuously.
2. Parenchyma is a dead tissue.
3. Phloem transports water.
4. Sclerenchyma provides mechanical strength.
5. Epithelial tissue covers body surfaces.
6. Blood is a connective tissue.
7. Skeletal muscles work involuntarily.
8. Cardiac muscles are branched.
9. Neurons transmit nerve impulses.
10. Ligaments connect bone to bone.

4. Match the Following

Column A	Column B
Parenchyma	Storage
Collenchyma	Flexibility
Sclerenchyma	Mechanical Strength
Xylem	Water Transport
Phloem	Food Transport
Blood	Fluid Connective Tissue
Tendon	Muscle to Bone
Ligament	Bone to Bone
Cardiac Muscle	Heart
Neuron	Nerve Impulse

5. Very Short Answer Questions

1. Define tissue.
2. Why do multicellular organisms need tissues?
3. Name the two main types of plant tissues.
4. What is differentiation?
5. State one function of parenchyma.
6. Why is collenchyma called a supporting tissue?
7. What is the main function of xylem?
8. Name the four main types of animal tissues.
9. What is the function of epithelial tissue?
10. What is a neuron?

6. Short Answer Questions

1. Explain the importance of division of labour in multicellular organisms.
2. Differentiate between meristematic tissue and permanent tissue.
3. Describe the structure and functions of parenchyma.
4. Write the characteristics of collenchyma.
5. Explain the functions of sclerenchyma.
6. Differentiate between xylem and phloem.
7. Explain the functions of epithelial tissue.
8. Describe the different types of connective tissues.
9. Differentiate between tendon and ligament.
10. Compare skeletal, smooth and cardiac muscles.

7. Long Answer Questions

1. Describe the classification of plant tissues with suitable examples.
2. Explain the structure and functions of simple permanent tissues.
3. Describe the structure and functions of xylem and phloem.
4. Explain the different types of animal tissues and their importance.
5. Describe the structure and functions of connective tissue.
6. Explain the different types of muscular tissues with suitable examples.
7. Describe the structure and functions of nervous tissue.
8. Differentiate between plant tissues and animal tissues.
9. Explain how different tissues work together in multicellular organisms.
10. Discuss the importance of tissues in plants and animals.

8. Case Study Questions

Case Study 1

A gardener cuts the tip of a plant. After a few days, new branches begin to grow from the sides of the stem.

1. Which tissue is responsible for the growth of the plant?
2. Which type of meristem is present at the tip of the shoot?
3. Why does growth continue after cutting the tip?
4. What is the importance of meristematic tissue?

Case Study 2

A farmer notices that a coconut shell is extremely hard, while the pulp inside is soft and stores food.

1. Which tissue makes the coconut shell hard?
2. Which tissue stores food inside the coconut?
3. State one function of sclerenchyma.
4. Why is parenchyma called a living tissue?

Case Study 3

A doctor explains that oxygen, nutrients and hormones are transported throughout the body by a fluid tissue.

1. Name the tissue.
2. To which category of animal tissue does it belong?
3. State two functions of this tissue.
4. Why is it called a connective tissue?

Case Study 4

A football player injures the tissue connecting his muscles to the bones during a match.

1. Which connective tissue is injured?
2. What is its function?
3. How is it different from a ligament?
4. Why is this tissue important for movement?

Case Study 5

A person quickly removes his hand after touching a hot utensil.

1. Which tissue carries the nerve impulse?
2. What is the structural and functional unit of this tissue?
3. Which tissue helps in the movement of the hand?
4. Why is coordination important in such situations?

9. Competency-Based Questions

1. Why do plants require both meristematic and permanent tissues?
2. How does the structure of parenchyma help in its function?
3. Why is sclerenchyma absent in young growing plant parts?
4. How do xylem and phloem work together in maintaining plant life?
5. Why is epithelial tissue considered a protective tissue?
6. How does blood act as a connective tissue?
7. Why are cardiac muscles different from skeletal muscles?
8. How do neurons help maintain body coordination?
9. Why is the division of labour important in multicellular organisms?
10. How does the structure of tissues determine their functions?

10. HOTS Questions

1. What would happen if plants had no meristematic tissue?
2. Why do aquatic plants contain aerenchyma while desert plants generally do not?
3. How would a plant be affected if xylem stopped functioning?
4. Why are bones hard but cartilage flexible, even though both are connective tissues?
5. What problems would arise if ligaments were replaced by tendons?
6. Why are smooth muscles unsuitable for voluntary movement?
7. How would the human body be affected if nervous tissue stopped transmitting impulses?
8. Explain why tissue specialisation is essential for large multicellular organisms.
9. How do different tissues work together to produce coordinated movement?
10. Do you think the structure of a tissue always determines its function? Justify your answer with suitable examples.