Delay in senescence is caused by the spray of

IBA

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Cytokinin

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ABA

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Solution

The correct option is C Cytokinin
Senescence means aging. Cytokinin is a plant hormone. It plays major role in cell proliferation and cell division. During senescence, cytokinin levels are low. It delays in senescence of leaves when sprayed externally by delaying the destruction of chlorophyll and proteins in leaves.
Thus, the correct answer is option C.

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