A. (iii) Assertion true, Reason false.
B. (i) Both true, Reason explains Assertion.
C. (iv) Assertion false, Reason true.
D. (iii) Assertion true, Reason false.
These answers depend on tissue structure, muscle function and joint movement characteristics.
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
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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/