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

(a) Abscisic acid 

(b) Ethylene

(c) GA3 

(d) Indole acetic acid

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Ans : (a) Abscisic acid

Explanation:

Abscisic acid prepares plants to cope with stress conditions like drought etc. by inducing stomatal closure and other reactions. Hence it is named stress hormone.

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