Question

Assertion (A): Abscisic acid is called stress hormone.
Reason (R): Abscisic acid increases the tolerance of plants to various kinds of stresses.

• A. \( (A) \text{ and } (R) \text{ are correct. } (R) \text{ is the correct explanation of } (A) \)
• B. \( (A) \text{ and } (R) \text{ are correct, but } (R) \text{ is not the correct explanation of } (A) \)
• C. \( (A) \text{ is correct but } (R) \text{ is not correct} \)
• D. \( (A) \text{ is not correct but } (R) \text{ is correct} \)

Hint:

Abscisic acid plays a major role in stress responses such as drought and cold, and its action is critical in maintaining plant homeostasis during adverse environmental conditions.

Answer 1

The Correct Option is A

Step 1: The assertion states that abscisic acid is a stress hormone, which is true as it is known to regulate responses to stress in plants.
Step 2: The reason provided, that abscisic acid increases the tolerance of plants to various kinds of stresses, is also true. Abscisic acid plays a significant role in plant stress tolerance by inducing various protective mechanisms like stomatal closure, etc.
Step 3: Since both (A) and (R) are true and (R) explains why (A) is true, the correct option is (1).