Which one of the following growth regulators is known as 'stress hormone'?

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Abscisic acid

Ethylene

GA₃

Indole acetic acid

answer is A.

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Detailed Solution

Abscisic acid acts as a general plant growth inhibitor and an inhibitor of plant metabolism. ABA inhibits seed germination. ABA stimulates the closure of stomata and increases the tolerance of plants to various kinds of stresses. Therefore, it is known as stress hormone.

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