In plants,the Richmond-Lang effect is:

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(A) The Richmond-Lang effect refers to the phenomenon where the application of cytokinin delays the onset of senescence (aging) in detached leaves or

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delaying the onset of senescence by the application of cytokinin.

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(A) The Richmond-Lang effect refers to the phenomenon where the application of cytokinin delays the onset of senescence (aging) in detached leaves or plant tissues. Cytokinins promote cell division and delay the degradation of chlorophyll and proteins,thereby maintaining the greenness and metabolic activity of the leaves for a longer period. This effect was first demonstrated by $A$. Richmond and $A$. Lang in $1957$ using Xanthium leaves.

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