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October 04, 2026

Tissue Class 9 Science Notes for SSC, RRB & Railway Exams

Tissue – Complete Study Notes for SSC, RRB & Other Competitive Exams

Introduction

Tissue is an important topic from Biology and is frequently useful in SSC, RRB, Railway, NTPC, Group D, SSC CGL, CHSL, GD, and other competitive examinations.

A tissue is a group of similar cells that work together to perform a particular function.

In multicellular organisms, cells are organized into tissues, tissues form organs, and organs work together to form an organ system.

Basic Organization

Cell → Tissue → Organ → Organ System → Organism

1. Plant Tissues

Plant tissues are mainly divided into:

Meristematic Tissue
Permanent Tissue

2. Meristematic Tissue

Meristematic tissues consist of actively dividing cells. They are responsible for the growth of plants.

Main Characteristics

Cells divide continuously.
Cells are generally small.
Cell walls are thin.
Cytoplasm is dense.
Nucleus is prominent.
Vacuoles are absent or very small.
Cells are closely packed.
Intercellular spaces are generally absent.

Types of Meristematic Tissue

There are three major types:

A. Apical Meristem

Found at the tips of roots and shoots.
Responsible for increase in the length of the plant.
It causes primary growth.

Exam Point: Apical meristem → Increase in length

B. Lateral Meristem

Found mainly along the sides of stems and roots.
Responsible for increase in girth or thickness.
Examples include cambium and cork cambium.

Exam Point: Lateral meristem → Increase in girth

C. Intercalary Meristem

Found at the bases of leaves or internodes, particularly in grasses.
Helps in the growth of internodes.
It also helps grasses regenerate after being cut or grazed.

Exam Point: Intercalary meristem → Growth of internodes

3. Permanent Tissue

Permanent tissues are formed from meristematic cells that lose their ability to divide and become specialized for particular functions.

Permanent tissues are broadly classified into:

Simple Permanent Tissue
Complex Permanent Tissue

4. Simple Permanent Tissue

Simple permanent tissue consists of similar types of cells.

The three main types are:

Parenchyma
Collenchyma
Sclerenchyma

A. Parenchyma

Parenchyma consists of living cells with thin cell walls.

Functions

Storage of food.
Storage of water in some plants.
Helps in photosynthesis when chloroplasts are present.

Parenchyma containing chloroplasts is called chlorenchyma.

Parenchyma with large air spaces, commonly found in aquatic plants, is called aerenchyma.

Exam Points

Parenchyma → Storage

Chlorenchyma → Photosynthesis

Aerenchyma → Buoyancy in aquatic plants

B. Collenchyma

Collenchyma consists of living cells whose cell walls are unevenly thickened at the corners.

Functions

Provides mechanical support.
Provides flexibility to young stems and leaves.
Allows plant parts to bend without breaking easily.

Exam Point: Collenchyma → Flexibility and support

C. Sclerenchyma

Sclerenchyma provides strength and mechanical support to plants.

Its cells are generally dead at maturity and have thick, lignified walls.

Functions

Provides strength.
Provides rigidity and protection.

Examples include fibres and sclereids.

Exam Point: Sclerenchyma → Strength and rigidity

5. Complex Permanent Tissue

Complex permanent tissues consist of different types of cells that work together to perform a common function.

The two main complex tissues are:

Xylem
Phloem

6. Xylem

Xylem is mainly responsible for the transport of water and minerals from roots to other parts of the plant.

Components of Xylem

Tracheids
Vessels
Xylem parenchyma
Xylem fibres

Important Point: Most components of xylem are dead except xylem parenchyma, which is living.

Main Function: Xylem → Transport of water and minerals

7. Phloem

Phloem transports food prepared by leaves to different parts of the plant.

Components of Phloem

Sieve tubes
Companion cells
Phloem parenchyma
Phloem fibres

Important Point: Most phloem components are living except phloem fibres, which are dead.

Main Function: Phloem → Transport of food

The movement of food through phloem is called translocation.

8. Difference Between Xylem and Phloem

Xylem	Phloem
Transports water and minerals	Transports food
Mainly transports from roots upward	Transports food from source to sink
Most components are dead	Most components are living
Provides mechanical support	Mainly involved in food transport
Contains vessels and tracheids	Contains sieve tubes and companion cells

Easy Trick

Xylem = Water

Phloem = Food

9. Protective Tissue

Protective tissues protect plants from injury, infection, water loss and other external factors.

Epidermis

The epidermis is the outermost layer of cells in many plant parts.

Protection.
Reducing water loss.
Protecting against mechanical injury.
Allowing exchange of gases through specialized structures.

Stomata

Stomata are tiny pores mainly found on the epidermis of leaves.

Each stoma is surrounded by guard cells.

Functions of Stomata

Exchange of gases.
Regulation of water loss through transpiration.

Exam Point: Guard cells control the opening and closing of stomata.

10. Animal Tissues

Animal tissues are broadly divided into four major types:

Epithelial Tissue
Connective Tissue
Muscular Tissue
Nervous Tissue

11. Epithelial Tissue

Epithelial tissue forms the covering or lining of many parts of the body.

Functions

Protection.
Absorption.
Secretion.
Excretion.
Exchange of substances.

Cells of epithelial tissue are generally closely packed with very little intercellular space.

Types of Epithelial Tissue

A. Squamous Epithelium

It consists of thin and flat cells.

Location

Lining of alveoli of lungs.
Lining of blood vessels.

Function: Helps in diffusion and exchange of substances.

Exam Point: Alveoli → Squamous epithelium

B. Cuboidal Epithelium

Cells are cube-shaped.

Location

Kidney tubules.
Ducts of glands.

Function

Secretion.
Absorption.

Exam Point: Kidney tubules → Cuboidal epithelium

C. Columnar Epithelium

Cells are elongated and column-shaped.

Location

Lining of the intestine.

Function

Absorption.
Secretion.

D. Ciliated Epithelium

Cells possess hair-like structures called cilia.

Location

Respiratory tract.
Certain parts of the reproductive tract.

Cilia help move substances in a particular direction.

Exam Point: Cilia → Movement of materials

E. Glandular Epithelium

Specialized epithelial cells form glands.

Function: Secretion of substances such as enzymes, mucus and hormones.

12. Connective Tissue

Connective tissue connects, supports, binds or protects different parts of the body.

Examples include:

Areolar tissue
Adipose tissue
Tendon
Ligament
Cartilage
Bone
Blood

A. Areolar Tissue

Areolar tissue is found between the skin and muscles and around blood vessels and nerves.

Supports internal organs.
Fills spaces between tissues.
Helps in tissue repair.

B. Adipose Tissue

Adipose tissue stores fat.

Stores energy.
Provides insulation.
Protects certain organs.

Exam Point: Adipose tissue → Fat storage

C. Tendon

A tendon connects muscle to bone.

Easy Trick: Tendon = Muscle → Bone

D. Ligament

A ligament connects bone to bone.

Easy Trick: Ligament = Bone → Bone

E. Cartilage

Cartilage is a flexible connective tissue.

Location

Nose.
Ear.
Trachea.
Ends of bones at joints.

Function

Provides support and flexibility.
Reduces friction at joints.

F. Bone

Bone is a hard connective tissue.

Provides support.
Protects internal organs.
Helps in movement.
Provides attachment for muscles.
Bone marrow is associated with blood cell formation.

Exam Point: Bone → Hard connective tissue

G. Blood

Blood is a fluid connective tissue.

It consists of:

Plasma
Red blood cells (RBCs)
White blood cells (WBCs)
Platelets

Transport of oxygen.
Transport of nutrients.
Transport of hormones and waste products.
Defence against infection.
Blood clotting.

Exam Point: Blood → Fluid connective tissue

13. Muscular Tissue

Muscular tissue is responsible for movement of the body and movement of substances within the body.

Striated muscle
Smooth muscle
Cardiac muscle

A. Striated Muscle

Also called skeletal or voluntary muscle.

Long, cylindrical fibres.
Striations are present.
Usually multinucleate.
Under voluntary control.

Location: Attached mainly to bones.

Exam Point: Striated muscle → Voluntary movement

B. Smooth Muscle

Also called unstriated muscle.

No visible striations.
Spindle-shaped cells.
Usually single nucleus.
Involuntary in action.

Location:

Intestine.
Stomach.
Blood vessels.
Urinary bladder.

Exam Point: Smooth muscle → Involuntary movement

C. Cardiac Muscle

Cardiac muscle is found in the heart.

Striated.
Involuntary.
Branched fibres.
Rhythmic contraction.

Exam Point: Cardiac muscle → Heart

14. Nervous Tissue

Nervous tissue is specialized for receiving and transmitting information.

The basic structural and functional unit of nervous tissue is the neuron.

Main Parts of a Neuron

Cell body
Dendrites
Axon

Functions

Receives stimuli.
Transmits nerve impulses.
Helps coordinate body activities.

Exam Point: Neuron → Structural and functional unit of nervous tissue

15. Important Differences for Exams

Plant Tissue vs Animal Tissue

Plant Tissue	Animal Tissue
Plants are generally stationary	Animals generally show active movement
Many plant tissues provide support and growth	Animal tissues are highly specialized for movement and coordination
Meristematic tissue is responsible for growth	Growth occurs differently and is not restricted to meristematic regions
Vascular tissues include xylem and phloem	Blood and other connective tissues perform transport-related functions

16. Most Important One-Liners

Tissue is a group of similar cells performing a specific function.
Meristematic tissue is responsible for plant growth.
Apical meristem increases the length of plants.
Lateral meristem increases the girth of plants.
Intercalary meristem helps in the growth of internodes.
Parenchyma mainly performs storage functions.
Chlorenchyma helps in photosynthesis.
Aerenchyma helps aquatic plants in buoyancy.
Collenchyma provides flexibility and support.
Sclerenchyma provides strength and rigidity.
Xylem transports water and minerals.
Phloem transports food.
Stomata help in gaseous exchange and transpiration.
Guard cells regulate the opening and closing of stomata.
Epithelial tissue forms protective coverings and linings.
Blood is a fluid connective tissue.
Tendon connects muscle to bone.
Ligament connects bone to bone.
Adipose tissue stores fat.
Cartilage provides flexible support.
Bone is a hard connective tissue.
Striated muscles are generally voluntary.
Smooth muscles are involuntary.
Cardiac muscles are found in the heart.
Neuron is the basic unit of nervous tissue.

17. Quick Revision Table

Tissue	Main Function	Important Example/Location
Apical meristem	Increase in length	Root/shoot tips
Lateral meristem	Increase in girth	Cambium
Intercalary meristem	Growth of internodes	Grasses
Parenchyma	Storage	Plant organs
Collenchyma	Flexibility	Young stems/leaves
Sclerenchyma	Strength	Fibres
Xylem	Water transport	Vascular tissue
Phloem	Food transport	Vascular tissue
Squamous epithelium	Diffusion	Alveoli
Cuboidal epithelium	Absorption/secretion	Kidney tubules
Columnar epithelium	Absorption/secretion	Intestine
Adipose tissue	Fat storage	Under skin
Tendon	Muscle to bone	Joints
Ligament	Bone to bone	Joints
Bone	Support/protection	Skeleton
Cartilage	Flexible support	Ear, nose
Blood	Transport	Blood vessels
Striated muscle	Voluntary movement	Attached to bones
Smooth muscle	Involuntary movement	Intestine
Cardiac muscle	Heart contraction	Heart
Nervous tissue	Impulse transmission	Brain, spinal cord, nerves

18. Important MCQs on Tissue

1. Which tissue is responsible for the growth of plants?

A. Permanent tissue
B. Meristematic tissue
C. Epithelial tissue
D. Connective tissue

Answer: B. Meristematic tissue

2. Which meristem increases the length of a plant?

A. Lateral meristem
B. Apical meristem
C. Intercalary meristem
D. Cork cambium

Answer: B. Apical meristem

3. Which tissue transports water and minerals in plants?

A. Phloem
B. Xylem
C. Parenchyma
D. Collenchyma

Answer: B. Xylem

4. Which tissue transports food in plants?

A. Xylem
B. Sclerenchyma
C. Phloem
D. Collenchyma

Answer: C. Phloem

5. Which plant tissue provides flexibility?

A. Sclerenchyma
B. Collenchyma
C. Xylem
D. Phloem

Answer: B. Collenchyma

6. Which tissue is mainly responsible for storage in plants?

A. Parenchyma
B. Sclerenchyma
C. Xylem
D. Phloem

Answer: A. Parenchyma

7. Which connective tissue connects muscle to bone?

A. Ligament
B. Tendon
C. Cartilage
D. Areolar tissue

Answer: B. Tendon

8. Which connective tissue connects bone to bone?

A. Tendon
B. Ligament
C. Adipose tissue
D. Blood

Answer: B. Ligament

9. Blood is classified as which type of tissue?

A. Muscular tissue
B. Nervous tissue
C. Fluid connective tissue
D. Epithelial tissue

Answer: C. Fluid connective tissue

10. Which tissue stores fat?

A. Areolar tissue
B. Adipose tissue
C. Cartilage
D. Bone

Answer: B. Adipose tissue

11. Which muscle tissue is found in the heart?

A. Smooth muscle
B. Striated muscle
C. Cardiac muscle
D. Skeletal muscle

Answer: C. Cardiac muscle

12. Which muscle is generally under voluntary control?

A. Smooth muscle
B. Cardiac muscle
C. Striated muscle
D. None of these

Answer: C. Striated muscle

13. Which tissue lines the alveoli of lungs?

A. Cuboidal epithelium
B. Squamous epithelium
C. Columnar epithelium
D. Glandular epithelium

Answer: B. Squamous epithelium

14. The structural and functional unit of nervous tissue is:

A. Nephron
B. Neuron
C. Alveolus
D. Platelet

Answer: B. Neuron

15. Which cells control the opening and closing of stomata?

A. Epidermal cells
B. Guard cells
C. Companion cells
D. Sieve cells

Answer: B. Guard cells

19. Super-Fast Revision Tricks

Plant Tissues

Meristematic = Growth

Apical = Length

Lateral = Girth

Intercalary = Internode

Parenchyma = Storage

Collenchyma = Flexibility

Sclerenchyma = Strength

Xylem = Water

Phloem = Food

Animal Tissues

Epithelium = Covering

Connective = Connecting/Supporting

Muscular = Movement

Nervous = Coordination

Important Connections

Tendon → Muscle to Bone

Ligament → Bone to Bone

Neuron → Nervous tissue

Cardiac muscle → Heart

Adipose → Fat storage

Blood → Fluid connective tissue

20. Exam Strategy

For SSC, RRB and Railway examinations, focus especially on:

Types of meristematic tissue.
Functions of apical, lateral and intercalary meristems.
Differences between parenchyma, collenchyma and sclerenchyma.
Functions of xylem and phloem.
Types of epithelial tissue and their locations.
Tendon vs ligament.
Bone, cartilage and blood.
Types of muscles.
Voluntary vs involuntary muscles.
Cardiac muscle.
Structure and function of neurons.
One-liner facts and tissue-based MCQs.

Final Revision Formula

Animal:
Epithelial → Covering | Connective → Support | Muscular → Movement | Nervous → Coordination

These points cover the most important concepts from the Tissue chapter for competitive-exam preparation and are especially useful for quick revision before SSC, RRB and Railway examinations.