Question

Which of the following is a parameter of senescence or old age?

• A. Slowing of metabolism
• B. The end of juvenile phase
• C. The end of reproductive phase
• D. Both A and B

Answer 1

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.

Final answer
Both A and B