| Senescence | Ageing |
|---|---|
| $(1)$ It refers to all collective,progressive,and deteriorative processes which ultimately lead to a complete loss of organization and function. | $(1)$ It includes all the chemical and structural changes that occur during the life span of a plant or its organ. |
| $(2)$ It includes only degenerative and deteriorative changes in a plant or its parts. | $(2)$ It is the sum total of metabolic changes that occur in a plant or its parts. |
| $(3)$ Senescence occurs as a result of ageing and leads to death. | $(3)$ Ageing is a permanent feature of all living organisms. |
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