Which of the following is a parameter of senescence or old age?
A
Slowing of metabolism
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B
The end of juvenile phase
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C
The end of reproductive phase
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D
Both A and B
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Solution
The correct option is D Both A and B Phases in the life of sexually reproducing organisms
Phases in sexually reproducing organisms are:
1) Juvenile phase - It is the phase between birth during which the organism undergoes developmental changes that will lead him to attain sexual maturity. It is followed by the reproductive phase.
2) Reproductive phase - It is the phase during which the organism can reproduce after attaining sexual maturity.
3) Senescent phase- This phase marks the end of the reproductive phase. In this phase the organism starts ageing and loses the ability to reproduce. The metabolic rate of the organism slows down.