What is senescence? 

Senescence is the process of aging of a plant after it reaches maturity, leading eventually to its death. The timing of senescence is species-specific and varies among the organs of individual plants. Some species of plants produce short-lived flowers whose petals last for only a few hours, while the leaves of deciduous plants last through long growing seasons before they shed.

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the leaf which is going to fall,and that leaf will loos its minerals 

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 It is the ageing of any tissue , say if leaves undergo senescence, it means that the leaf tissues are ageing generally yellowing or death ( fallling of leaves).

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