The regulator which retards ageing senescence of plant parts is

Cytokinin

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Auxin

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Gibberellin

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Abscisic acid

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Solution

The correct option is A Cytokinin
Cytokinins is a plant hormone. It retards ageing senescence of plant parts and thus keep them productive for longer duration. This is called as Richmond Lang effect. It delays destruction of chlorophyll. It has an effect on protein synthesis and mobilizing nutrients.
Thus, the correct answer is option A.

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