CBSE Class 9 Science Chapter 3: Tissues in Action — Assertion & Reason
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The following Assertion and Reason questions are based on Chapter 3: Tissues in Action from the NCERT Class 9 Science textbook. Each question has four options — read both the Assertion (A) and Reason (R) carefully before selecting your answer.
How to attempt Assertion & Reason questions:
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is NOT the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is NOT the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Assertion & Reason Questions
1
Assertion (A): Plants and animals have different tissue structures because of their different modes of life.
Reason (R): Plants are fixed and need rigid support, whereas animals move and require flexible tissues for locomotion.
Reason (R): Plants are fixed and need rigid support, whereas animals move and require flexible tissues for locomotion.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The difference in mobility and support requirements is a primary reason plant and animal tissues differ in structure.
2
Assertion (A): Roots of a plant continue to grow in length even if their tips are cut off.
Reason (R): The apical meristem responsible for length increase is located only at the nodes of the stem.
Reason (R): The apical meristem responsible for length increase is located only at the nodes of the stem.
Answer: (d)
A is false, and R is false. (Note: Under standard options, if A is false, the answer is generally marked as such. Here, Roots stop growing in length if their tips are cut because the apical meristem, which causes this growth, is located exactly at the root and shoot tips, not the nodes).
3
Assertion (A): The stem of a dicot plant increases in diameter or girth over time.
Reason (R): Lateral meristem cells divide and produce new cells inside and outside in a concentric manner.
Reason (R): Lateral meristem cells divide and produce new cells inside and outside in a concentric manner.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Lateral meristems are arranged in a ring and are specifically responsible for increasing the girth of the plant.
4
Assertion (A): Grass can quickly grow back after being mowed or grazed by animals.
Reason (R): The intercalary meristem located at the nodes helps the plant regenerate parts that are cut.
Reason (R): The intercalary meristem located at the nodes helps the plant regenerate parts that are cut.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Intercalary meristems at the base of the internodes or nodes enable this rapid regrowth in grasses.
5
Assertion (A): Cells of meristematic tissues generally lack vacuoles.
Reason (R): Meristematic cells are dead cells that only provide mechanical support to the plant.
Reason (R): Meristematic cells are dead cells that only provide mechanical support to the plant.
Answer: (c)
A is true, but R is false. Meristematic cells lack vacuoles because they are tightly packed and actively dividing, but they are very much living cells, not dead ones.
6
Assertion (A): The epidermis in desert plants is often covered by a thick layer of cuticle.
Reason (R): The thick cuticle reduces water loss during the process of transpiration.
Reason (R): The thick cuticle reduces water loss during the process of transpiration.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The waxy cutin layer protects against excessive water loss in dry habitats.
7
Assertion (A): A fresh twig can bend without breaking, but a dry twig breaks easily.
Reason (R): Collenchyma tissue consists of living cells with pectin deposition that provides support and flexibility.
Reason (R): Collenchyma tissue consists of living cells with pectin deposition that provides support and flexibility.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Collenchyma allows parts of the plant like stems and tendrils to bend flexibly.
8
Assertion (A): The hard covering of seeds and nuts like coconut husks is made of sclerenchyma.
Reason (R): Sclerenchyma cells have thick walls due to the deposition of pectin.
Reason (R): Sclerenchyma cells have thick walls due to the deposition of pectin.
Answer: (c)
A is true, but R is false. Sclerenchyma cells have thick walls due to the deposition of lignin, not pectin. Pectin is found in collenchyma.
9
Assertion (A): Xylem and phloem are called complex permanent tissues.
Reason (R): They are composed of more than one type of cell working together to perform a specific function.
Reason (R): They are composed of more than one type of cell working together to perform a specific function.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Complex tissues consist of multiple cell types, unlike simple tissues which consist of only one type.
10
Assertion (A): Phloem primarily transports water and minerals from the roots to the leaves.
Reason (R): Phloem is mostly made up of living cells like sieve tubes and companion cells.
Reason (R): Phloem is mostly made up of living cells like sieve tubes and companion cells.
Answer: (d)
A is false, but R is true. Phloem transports food prepared in the leaves to other parts of the plant. Xylem is responsible for transporting water and minerals.
11
Assertion (A): Epithelial tissue forms the outer covering of the body and lines internal organs.
Reason (R): The cells of epithelial tissue have large intercellular spaces to allow germs to enter freely.
Reason (R): The cells of epithelial tissue have large intercellular spaces to allow germs to enter freely.
Answer: (c)
A is true, but R is false. Epithelial cells are closely packed with very little space between them specifically to prevent the entry of germs and reduce water loss.
12
Assertion (A): Blood and bone are both classified as connective tissues.
Reason (R): Blood has a soft, fluid matrix whereas bone has a hard, rigid matrix.
Reason (R): Blood has a soft, fluid matrix whereas bone has a hard, rigid matrix.
Answer: (b)
Both A and R are true, but R is NOT the correct explanation of A. They are both connective tissues because they connect and support other tissues, not because their matrices differ.
13
Assertion (A): Cartilage provides flexibility and cushions the ends of bones.
Reason (R): Cartilage has a rigid matrix containing calcium and phosphorus compounds.
Reason (R): Cartilage has a rigid matrix containing calcium and phosphorus compounds.
Answer: (c)
A is true, but R is false. Cartilage has a soft, jelly-like matrix. Bones have the rigid matrix containing calcium and phosphorus.
14
Assertion (A): Ligaments connect muscles to bones and bring about movement.
Reason (R): Tendons connect bones to bones and prevent excessive movement at the joints.
Reason (R): Tendons connect bones to bones and prevent excessive movement at the joints.
Answer: (d)
A is false and R is false. The functions are swapped: Tendons connect muscles to bones, while ligaments connect bones to bones.
15
Assertion (A): We can consciously control the movement of our arms and legs.
Reason (R): The skeletal muscles attached to our bones are voluntary muscles under conscious control.
Reason (R): The skeletal muscles attached to our bones are voluntary muscles under conscious control.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Skeletal muscles bring about voluntary movements.
16
Assertion (A): Smooth muscles help in slow, continuous movements like the passage of food in the intestines.
Reason (R): Smooth muscle cells are spindle-shaped, unstriated, and function involuntarily.
Reason (R): Smooth muscle cells are spindle-shaped, unstriated, and function involuntarily.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Their involuntary nature allows continuous internal organ movements without conscious effort.
17
Assertion (A): Cardiac muscles work tirelessly and rhythmically throughout a person's life without fatigue.
Reason (R): Cardiac muscles are a type of skeletal muscle attached to the rib cage.
Reason (R): Cardiac muscles are a type of skeletal muscle attached to the rib cage.
Answer: (c)
A is true, but R is false. Cardiac muscles are found exclusively in the heart, not attached to the skeletal rib cage.
18
Assertion (A): The shoulder joint allows arm movement in forward, backward, sideways, and circular directions.
Reason (R): The shoulder forms a hinge joint with the collarbone.
Reason (R): The shoulder forms a hinge joint with the collarbone.
Answer: (c)
A is true, but R is false. The shoulder allows this wide range of movement because it is a ball and socket joint, not a hinge joint.
19
Assertion (A): The neck features a pivot joint connecting the skull to the backbone.
Reason (R): This pivot joint allows the head to move side to side like a doorknob turning in its socket.
Reason (R): This pivot joint allows the head to move side to side like a doorknob turning in its socket.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The specific structure of the pivot joint permits this turning movement.
20
Assertion (A): The bones of the skull are connected by fixed joints.
Reason (R): Fixed joints do not allow movement, which is essential to keep the delicate brain safe and protected.
Reason (R): Fixed joints do not allow movement, which is essential to keep the delicate brain safe and protected.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Fixed joints ensure the protective casing of the skull remains rigid.
❓ Frequently Asked Questions
What is covered in CBSE Class 9 Science Chapter 3 Tissues in Action?
This chapter covers all key topics from Tissues in Action as per CBSE 2026-27 syllabus.
Is this Assertion & Reason useful for CBSE board exams?
Yes, designed for CBSE Class 9 board exam preparation covering the complete syllabus.
Are these CBSE Class 9 Science Assertion & Reason updated for 2026-27?
Yes, all content at eBookPublisher is updated as per the latest 2026-27 CBSE syllabus.
How many chapters are in CBSE Class 9 Science?
All chapters of CBSE Class 9 Science are covered at eBookPublisher with free Assertion & Reason for each chapter.
Can I study Tissues in Action online for free?
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