Question

Indole acetic acid (IAA) is involved in ...........

• A. gravitropism
• B. flowering
• C. ripening
• D. senescence

Hint:

IAA, a form of auxin, plays a key role in plant growth responses, particularly in gravitropism, where it helps the plant orient its growth according to gravity.

Answer 1

The Correct Option is A

Step 1: Understanding IAA.
Indole acetic acid (IAA) is a form of auxin, a plant hormone that regulates various processes in plants, including growth, elongation, and response to environmental stimuli. IAA is particularly involved in gravitropism, the plant's response to gravity.
Step 2: Analyzing the options.
(A) gravitropism: Correct — IAA is involved in gravitropism, which is the plant's growth response to gravity.
(B) flowering: Incorrect — Flowering is regulated by different hormones, such as gibberellins and florigen.
(C) ripening: Incorrect — Ripening is regulated by ethylene, not IAA.
(D) senescence: Incorrect — Senescence is regulated by other hormones like ethylene and abscisic acid.
Step 3: Conclusion.
The correct answer is (A) gravitropism, as IAA is directly involved in the plant's response to gravity.