Leaf abscission is caused by

ABA

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cytokinin

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auxin

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gibberellin

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Solution

The correct option is A ABA
A plant will abscise apart either to discard a membrane that is no longer necessary, such as a leaf during autumn or a flower following fertilization or for the purpose of reproduction. Most deciduous plants drop their leaves by abscission before winter, whereas evergreen plants continuously abscise their leaves.
So, the correct option is 'ABA'.

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