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Solution


Q.

Which one of the following growth regulators is known as ‘stress hormone’           [2014]
1 Abscisic acid  
2 Ethylene  
3 GA3  
4 Indole acetic acid  

Ans.

(1)

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.