Question

ASSERTION (A): Veins are thin
walled vessels and have valves
in them. REASON (R): Veins
distribute blood to various
parts of the body.
*

a) Both A and Rare true and Ris the
correct explanation of the assertion.
Both A and Rare true but Ris not
b) the correct explanation of the
assertion.

c) A is true but Ris false.

d) A is false but Ris true.​

Answer 1

c) A is true but R is false

Answer 2

Answer:

The most appropriate answer is c) A (assertion) is true but R (Reason) is false.

Explanation:

• Blood capillaries unite into small vessels called venules which in turn, join to form bigger vessels called veins.

• Veins have thin walls as compared to arteries. Since blood flow through it exerts no pressure on the walls of veins, they need no thick walls.

• To ensure a unidirectional one-way flow of blood in the heart, these are guarded by valves. Hence assertion is true & correct.

• Veins don't distribute blood to various body parts, it collects the deoxygenated blood from tissues or body parts and returns it to the heart after circulation. Hence reason is completely discarded.

Hence the correct option is c).

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