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Question

The plant hormone that slows plant growth and regulate stomata during adverse conditions is

A
Gibberellin
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B
IAA
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C
Abscisic acid
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D
Ethylene
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E
Phytochrome
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Solution

The correct option is D Abscisic acid
Abscisic acid is an inhibitory plant hormone which gives a response to the abiotic stress conditions. It induces dormancy in seeds by blocking germination and promoting the synthesis of storage proteins. It reduces the stomatal aperture in less water availability and causes the closing of stomata to reduce transpiration in winters. Another effect of ABA is to promote the development of winter buds; it mediates the conversion of the apical meristem into a dormant bud.

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