Question

write an essay on scencescence​

Answer 1

Explanation:

Senescence (/sɪˈnɛsəns/) or biological aging is the gradual deterioration of functional characteristics. The word senescence can refer either to cellular senescence or to senescence of the whole organism. Organismal senescence involves an increase in death rates and/or a decrease in fecundity with increasing age, at least in the latter part of an organism's life cycle.

Supercentenarian Ann Pouder (8 April 1807 – 10 July 1917) photographed on her 110th birthday. A heavily lined face is common in human senescence.

Senescence is the inevitable fate of all multicellular organisms with germ-soma separation,[1][2] but it can be delayed. The discovery, in 1934, that calorie restriction can extend lifespan by 50% in rats, and the existence of species having negligible senescence and potentially immortal organisms such as Hydra, have motivated research into delaying senescence and thus age-related diseases. Rare human mutations can cause accelerated aging diseases.

Environmental factors may affect aging, for example, overexposure to ultraviolet radiation accelerates skin aging. Different parts of the body may age at different rates. Two organisms of the same species can also age at different rates, making biological aging and chronological aging distinct concepts.

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Answer 2

Answer:

Senescence is the orderly, age‐induced breakdown of cells and their components, leading to the decline and ultimate death of a plant or plant part. 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 before shriveling and dropping off, while the leaves of deciduous plants last through long growing seasons before senescing.

Senescence is a metabolic process; therefore, it requires energy. It is not simply the ending of growth. Leaves, for example, move the products of photosynthesis—and their own structural substances—out of leaf tissue into stem and root tissue during senescence and before their vascular connections are severed at abscission. One of the first materials to degrade is the energy‐converting pigment chlorophyll. As the bright green color of chlorophyll fades, the yellow‐orange colors of the carotenoids become prominent and combine with the red‐blue anthocyanins to produce the vivid colors of autumn in the trees and shrubs of the northern deciduous forest.