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Which of the following plant hormone causes a delay in leaf senescence?

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Which of the following plant hormone causes a delay in leaf senescence?

(a) Abscisic acid

(b) Ethylene

(c) Auxin

(d) Cytokines

I had been asked this question by my school principal while I was bunking the class.

I'm obligated to ask this question of Plant Hormones in portion Plant Physiology of Life Sciences

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The correct choice is (d) Cytokines

For explanation: Senescence is an aging process which is an energy driven genetic program. Presence of cytokines delay in leaf senescence.

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