Q.

Stomatal closure is promoted by the following plant growth regulator.

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a

Ethylene

b

Cytokinin

c

Auxin

d

Abscisic acid

answer is D.

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Detailed Solution

Abscisic acid promotes the closure of stomata and decreasing rate of transpiration. It makes guard cells flaccid by promoting the exit of water from guard cells to subsidiary cells. Hence the hormone is described as anti-transpirant and stress hormone.

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