alleryIn a drought a hormone closes the stomata and is called the stress hormone. It is:
AAbscisic acid
BGibberellic acid
CIndole acetic acid
DKinetin purine
Answer & Solution
Correct answer: A. Abscisic acid
1. ABA stimulates stomatal closure.
2. It raises tolerance to many stresses.
3. So ABA is the stress hormone.
_Source: syllabus Biology, Chapter 15, Plant Growth and Development._
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