Q.State, in one sentence, what is meant by 'senescence' in the developmental sequence of a plant cell or organ.

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Senescence is the genetically programmed, orderly decline in metabolic activity leading to the death of a cell, organ or plant. …

Senescence is the terminal step in the developmental sequence of a plant cell, tissue or organ (and, in an annual plant, of the entire individual) -- a genetically programmed, generally orderly decline in metabolic activity, chlorophyll and nutrient content, and structural integrity, occurring after maturation and ultimately leading to death. It is distinguished from sudden, non-programmed cell death (such as death caused by an external injury) by being an internally regulated process, one that plant growth regulators such as cytokinin (which delays it) and ethylene (which acc …

State senescence as the programmed final phase of the developmental sequence, follo …

Describing senescence simply as 'a plant dying' without the key qualifier that it is a genetically programmed, orderly …