alleryWhich plant hormone is called the stress hormone because it increases plant tolerance to stress and causes stomatal closure during drought?
AAbscisic acid
BGibberellin
CCytokinin
DAuxin
Answer & Solution
Correct answer: A. Abscisic acid
1. Abscisic acid (ABA) is a growth inhibitor that regulates abscission and dormancy.
2. It raises plant tolerance to various kinds of stress, so it is called the stress hormone.
3. During water stress and drought it causes stomatal closure to limit water loss.
4. Cytokinin, gibberellin and auxin are growth promoters, so they are ruled out.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 16 Plant and Animal Hormones "Abscisic Acid", p.239_
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