Question

what is meant by the following terms : ageing, senescence

Answer 1

Ageing is the process during which structural and functional changes accumulate in an organism as a result of the passage of time. The changes manifest as a decline from the organism's peak fertility and physiological functions until death.

Senescence is the process by which cells irreversibly stop dividing and enter a state of permanent growth arrest without undergoing cell death. Senescence can be induced by unrepaired DNA damage or other cellular stresses.

Answer 2

Ageing:

1. Ageing is progressive deterioration in the body of the organisms. There is general decline in metabolic processes.

2. It is not essential that ageing starts at the end of reproductive phase.

3. Ageing leads to senescence.

Senescence:

1. The terminal stage of ageing is called senescence. In plants it is characterized by yellowing of leaves and leaf fall.

2. Senescence (old age) starts at the end of reproductive phase.

3. Senescence leads to death.

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