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Question

Which among the following can be considered as a sign of a senescent phase in humans?
i) Slowing of metabolism
ii) End of reproductive phase
iii) No increase in height

A
Only ii
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B
Both ii and iii
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C
Both i and ii
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D
Both i and iii
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Solution

The correct option is C Both i and ii
The phase during which an organism is unable to reproduce and grows old is termed as a senescent phase. It is the last phase of life cycle. In humans, the senescent phase or old age can be marked by the end of the reproductive phase. Another change occurring during the same time is the slowing of metabolism.
Increase in height is limited in organisms like humans. It stops after a certain age much before the senescent phase. Hence, it is not considered as a sign of a senescent phase in humans.

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