The main biological significance of senescence is:
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It helps in recycling the mineral nutrients. There by enrich the nutrients in the soil so that it helps in the seed germination and the growth of new plants.
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It maintains the efficiency of the plants as the older organs does not require further nutrients so that these nutrients can be used by the young growing parts.
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The falling of leaf helps to reduce the transpiration so that they can survive under the adverse conditions.
