Richmond Lang effect is due to .........................

Cytokinin

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Auxin

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ABA

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All of the above

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Solution

The correct option is A Cytokinin
Cytokinins are the phytohormones which can delay plant senescence by the stimulation of cell division. Cytokinins also prevent the destruction of chlorophyll and consequently the plant parts do not turn yellow. This is known as Richmond Lang effect after the workers who discovered it.

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