Arrange the following in correct sequence with respect to the events of menstrual cycle:
(A) Development of primary follicle to graafian follicle
(B) Attainment of peak level in luteinising hormone
(C) Release of ovum by graafian follicle
(D) Formation of corpus luteum
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A), (B), (C), (D)
(A) Development of primary follicle to graafian follicle — first. In the follicular phase, under FSH and LH, a follicle matures.
(B) Attainment of peak level in luteinising hormone — second. LH and FSH peak in the middle of the cycle (the LH surge).
(C) Release of ovum by graafian follicle — third. The LH surge causes the follicle to rupture: ovulation, about day 14.
(D) Formation of corpus luteum — last. The remaining follicle becomes the corpus luteum, which secretes progesterone.
NCERT Extract:
Menstrual Cycle – “… Both LH and FSH attain a peak level in the middle of cycle (about 14th day). Rapid secretion of LH leading to its maximum level during the mid-cycle called LH surge induces rupture of Graafian follicle and thereby the release of ovum (ovulation). The ovulation (ovulatory phase) is followed by the luteal phase during which the remaining parts of the Graafian follicle transform as the corpus luteum (Figure 2.9).”