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

auxin

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cytokinin

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gibberellin

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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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