The hormone which reduces transpiration rate by inducing stomatal closure is _________________.

ABA

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ethylene

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cytokinin

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gibberellin.

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Solution

The correct option is A ABA
ABA (Absisic acid) is a stress hormone which is synthesised by the plant during drought or other stress conditions. It causes rapid movement of $K^{+}$ ions out of the guard cells, closes stomatal pores and thus reduces the transpiration rate.

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