The chief role of cytokinin is

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(D) Cytokinins are plant hormones that promote cell division. Their primary physiological roles include delaying senescence (aging) in leaves and othe

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To mobilise solutes to different parts of plant and check senescence

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(D) Cytokinins are plant hormones that promote cell division. Their primary physiological roles include delaying senescence (aging) in leaves and other plant organs,and promoting the mobilization of nutrients and solutes to various parts of the plant,which helps in maintaining the metabolic activity of the tissues. Therefore,option $D$ is the most comprehensive answer.

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