Assertion : Corpus luteum degenerates in the absence of fertilization.
Reason : Progesterone level decreases.
Menstrual cycle is controlled by
Changes in $GnRH$ pulse frequency in femail is controlled by circulating levels of
If after ovulation no pregnancy results, the corpus luteum
About which day in a normal human menstrual cycle does rapid secretion of $LH$ (popularly called $LH$ surge) normally occurs?