Which of the following plant hormones reduces transpiration rate by inducing stomatal closure

Ethylene

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Gibberellin

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ABA

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Cytokinin

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Solution

The correct option is C ABA
ABA (abscisic acid) is a plant hormone. It is also called as stress hormone as its concentration increases during stress condition. During adverse environmental conditions like drought, it induces stomatal closure. This results in reduced transpiration rate during water stress condition.
Thus, the correct answer is option C.

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