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Question

is a phytohormone which plays an important role in regulating abscission and dormancy.

A
auxin
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B
cytokinin
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C
gibberellin
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D
abscisic acid
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Solution

The correct option is D abscisic acid
Abscisic acid (ABA) is a plant growth inhibitor which plays an important role mostly in regulating abscission and dormancy. All others plant hormones like auxin, gibberellin and cytokinin are the plant growth promoters.

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