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

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

Plant Growth and Development

Solution:

$ABA$ (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.