Discuss about menarche and menopause.

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Solution

Menarche
(i) It refers to beginning of menstruation at puberty in primate/human females. In human beings menstruation begins at about 13 years of age.
(ii) It marks the beginning of reproductive phase.
Menopause
(i) It refers to stoppage of menstruation and menstrual cycle, at the age of 45−55.
(ii) It marks the end of reproductive phase.

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