Define senescence. How is it regulated in plants?

Senescence is a biological process that refers to the programmed deterioration of cells, tissues, and organs that ultimately leads to the death of an organism. This process is a natural and necessary phenomenon in the life cycle of all living organisms, including plants. In plants, senescence plays a vital role in a variety of physiological processes, such as the remobilization of nutrients from aging tissues to developing organs, the regulation of plant growth and development, and ____ ________ __________ ___ ______ ________ ________ ________ ____ _______.
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