Multiple choice

Which one of the following is produced during water stress and causes closure of stomata?

  1. Abscisic acid

  2. Auxin

  3. Gibberellin

  4. Ethylene
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Abscisic acid (ABA, Option A) is a plant hormone produced during water stress conditions. It accumulates in guard cells and triggers stomatal closure to prevent further water loss. This is a crucial drought response mechanism. Auxin (B) and Gibberellin (C) are growth hormones. Ethylene (D) is involved in fruit ripening and stress responses but not primarily in stomatal closure.

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