Onset of menstruation is due to
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
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$A$ : Most birds possess only the left ovary and left oviduct for conveying the ovum released from the ovary.
$R$ : The avian ovary does not form a corpus luteum from the ruptured ovarian follicle which undergoes rapid shrinkage
$A$ : Most birds possess only the left ovary and left oviduct for conveying the ovum released from the ovary.
$R$ : The avian ovary does not form a corpus luteum from the ruptured ovarian follicle which undergoes rapid shrinkage
The best definition of the process of gastrulation is that, it is a process where the
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