Which of the following can retard the ageing of plant organs?

Auxin

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Ethylene

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Cytokinin

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None of the above.

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Solution

The correct option is C Cytokinin
Cytokinins are a group of plant hormones, including kinetin, which acts synergetically with auxins to promote cell division.
Cytokinins can retard ageing of plant organs by controlling protein synthesis and mobilization of resources. Cut leaves dipped in cytokinins stay green longer than the control leaves.
Thus, the correct answer is option (C), 'Cytokinin'.

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