1(v)
Assertion (A): Abscisic acid promotes stomatal closure during a drought.
Reason (R): Abscisic acid helps the plant to conserve water during stress.
- (a)(A) is true and (R) is false
- (b)(A) is false and (R) is true
- (c)Both (A) and (R) are true and (R) is the correct explanation of (A).
- (d)Both (A) and (R) are true and (R) is not the correct explanation of (A).
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Both (A) and (R) are true and (R) is the correct explanation of (A).
Reason — During drought stress, abscisic acid signals the guard cells to close stomata, which reduces transpiration and prevents excessive water loss.
Therefore, Both (A) and (R) are true (R) is the correct explanation of (A).