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In each of the following cases (A, B, C and D), choose the correct option as given below: (i) Both (A) and (R) are true and (R) is the correct explanation of (A). (ii) Both (A) and (R) are true, but (R) is not the correct explanation of (A). (iii) (A) is true, but (R) is false. (iv) (A) is false, but (R) is true. A. Assertion: Epithelium is well-suited for gas exchange in the lungs. Reason: It consists of multiple layers of tall cells that slow down diffusion. B. Assertion: Cardiac muscle can contract continuously without fatigue. Reason: Cardiac muscle cells have a high number of mitochondria and an abundant blood supply. C. Assertion: Tendons connect bone to bone and allow joint movement. Reason: Tendons are made of tough connective tissue that transmits force from muscle to bone. D. Assertion: In a hinge joint, movement occurs primarily in one plane. Reason: The bone ends are shaped to allow sliding in all directions
A.(iii) Epithelium supports gas exchange, but lungs have thin simple epithelium, not multiple tall layers. B. (i) Cardiac muscles resist fatigue because of many mitochondria and rich blood supply. C. (iv) Tendons connect muscles to bones, not bones to bones. D. (iii) Hinge joints move mainly in oneRead more
A.(iii) Epithelium supports gas exchange, but lungs have thin simple epithelium, not multiple tall layers.
B. (i) Cardiac muscles resist fatigue because of many mitochondria and rich blood supply.
C. (iv) Tendons connect muscles to bones, not bones to bones.
D. (iii) Hinge joints move mainly in one plane, but they do not allow sliding in all directions like ball and socket joints.
For more NCERT Solutions of Class 9 Science Exploration Chapter 3 Tissues in Action Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-3/
See lessCoconut husk fibres are used for mats which are tough and fibrous. Which tissue has structural features suitable for providing this strength? Explain why living parenchyma couldn’t serve the same purpose.
Coconut husk fibres contain sclerenchyma tissue, which has thick, lignified and dead cells that provide great strength, hardness and durability. These characteristics make the fibres suitable for tough mats and ropes. Parenchyma tissue could not serve this purpose because its living cells have thinRead more
Coconut husk fibres contain sclerenchyma tissue, which has thick, lignified and dead cells that provide great strength, hardness and durability. These characteristics make the fibres suitable for tough mats and ropes. Parenchyma tissue could not serve this purpose because its living cells have thin walls, soft texture and mainly perform storage and photosynthesis instead of providing rigid mechanical support.
For more NCERT Solutions of Class 9 Science Exploration Chapter 3 Tissues in Action Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-3/
See lessTissues in Action. Explain.
“Tissues in Action” describes how cells divide, specialise and organise themselves into tissues organs and organ systems. Similar cells work together to perform specific functions like movement, protection, transport and coordination. In plants and animals, tissues create division of labour, makingRead more
“Tissues in Action” describes how cells divide, specialise and organise themselves into tissues organs and organ systems. Similar cells work together to perform specific functions like movement, protection, transport and coordination. In plants and animals, tissues create division of labour, making body functions more efficient. The chapter explains growth, tissue structure, functions and coordination in living organisms for survival and development.
For more NCERT Solutions of Class 9 Science Exploration Chapter 3 Tissues in Action Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-3/
See lessHow is the study of cells and tissues significant for understanding the life processes and human welfare?
Studying cells and tissues helps scientists understand important life processes like growth, reproduction, movement, healing and transport of substances. This knowledge supports medical treatments organ repair, tissue culture, genetic engineering and disease control. It also improves agriculture thrRead more
Studying cells and tissues helps scientists understand important life processes like growth, reproduction, movement, healing and transport of substances. This knowledge supports medical treatments organ repair, tissue culture, genetic engineering and disease control. It also improves agriculture through better crops and plant regeneration methods. Therefore, understanding cells and tissues is essential for scientific progress, healthcare development and human welfare.
For more NCERT Solutions of Class 9 Science Exploration Chapter 3 Tissues in Action Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-3/
See lessHow are tissues in plants and animals different and why?
Plant and animal tissues differ in structure and function because plants and animals have different lifestyles. Plants are fixed and need supporting, conducting and growing tissues. Animals move actively and require muscular, nervous and flexible tissues for movement and coordination. Plants prepareRead more
Plant and animal tissues differ in structure and function because plants and animals have different lifestyles. Plants are fixed and need supporting, conducting and growing tissues. Animals move actively and require muscular, nervous and flexible tissues for movement and coordination. Plants prepare food through photosynthesis, while animals digest food. Therefore, their tissues develop differently according to their functional needs.
For more NCERT Solutions of Class 9 Science Exploration Chapter 3 Tissues in Action Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-3/
See less