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2.Human Reproduction
normal
Onset of menstruation is due to
A
Fall in level of progesterone
B
Increase in level of progesterone
C
Increase in level of $FSH$
D
None of these
Solution
(a)The uterine lining dies due to the deficiency or reduced level of progesterone in blood and is sloughed off. Blood vessels rupture, causing bleeding.
Standard 12
Biology
