Leaf abscission is prevented by

Gibberellin

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Ethylene

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Abscisic acid

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Auxin

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Solution

The correct option is D Auxin
Leaf abscission is a detachment or fall of older leaves.It occurs at the base of the petiole. When auxin is applied to the base of petiole of young leaf, the abscission is greatly suppressed. Also, it is observed that the intact leaf does not fall off because it synthesizes auxin.
Thus, the correct answer is option D.

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