Which of the following causes delaying of senescence?

Cytokinins

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Auxins

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IAA

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Ascorbic acid

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Solution

The correct option is A Cytokinins
Cytokinins retard the aging in plants. The effect is called as Richmond-Lang effect. Richmond-Lang effect is retardation of aging due to cytokinins which acts by retarding the rate of destruction of chlorophyll and yellowing of leaves.
Thus, the correct answer is option A.

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