Question

What is senescence? Which hormone stops senescence?

Answer 1

Hint: Senescence is a face or period after the reproductive phase when a cell loses its ability to reproduce. Here, the cell may age and stop dividing, but it does not die. It can either happen at the cell level or it can affect the entire life-form.

Complete answer:
In this process, cells stay within the body and may cause various types of illness. Over time, a significant amount of such cells may accumulate in tissues, remain active and release harmful substances. These substances may cause inflammation and damage to the healthy cells near them. They can even give birth to metal diseases like cancer. In simple words, senescence is biological ageing. It refers to the state where cells can no longer divide. However, it is inevitable in every multicellular organism, be it a human, animal or a plant. Therefore, it pertains to biological ageing of every living thing and involves a gradual decline of morphological features and purpose of the cell for the whole organism. Furthermore, senescent phase entails detriment and benefit for organisms in which such cells live. Similar to humans, senescence is the process of ageing in plants. Flowers, fruits, leaves of plants show senescence; it prepares plants for dormancy. The plant shows both trees included and age-related senescence. Cytokinin is a plant hormone which prevents senescence.

Note: The senescent phase is a vital process in the life cycle of every living organism. Plants have both stress-induced and age-related developmental ageing. Leaf senescence has the important function of recycling nutrients, mostly nitrogen, to growing and storage organs of the plant.