Question

Select the option that shows correct statements :
(i) Corpus luteum secretes progesterone.
(ii) Only FSH attains a peak level in middle of cycle.
(iii) LH surge induces rupture of graafian follicle.
(iv) Luteal phase of menstrual cycle is also called proliferative phase.

• A. Only (ii) is correct.
• B. (i) and (iii) are correct.
• C. Only (iv) is correct.
• D. (ii) and (iv) are correct.

Hint:

Remember the synonyms for the phases:
Follicular Phase = Proliferative Phase.
Luteal Phase = Secretory Phase.
This is a frequent point of confusion in exams.

Answer 1

The Correct Option is B

Let's analyze each statement related to the menstrual cycle for correctness:

1. (i) Corpus luteum secretes progesterone.
   • This is correct. The corpus luteum forms from the ruptured graafian follicle after ovulation and secretes progesterone, a hormone that supports the uterine lining.
2. (ii) Only FSH attains a peak level in middle of cycle.
   • This is incorrect. While FSH (Follicle Stimulating Hormone) does have a role, it's actually the LH (Luteinizing Hormone) that peaks in the middle of the cycle to induce ovulation. Both hormones influence the cycle, but the LH surge is more significant at mid-cycle (at ovulation time).
3. (iii) LH surge induces rupture of graafian follicle.
   • This is correct. The LH surge triggers the rupture of the mature graafian follicle, releasing the egg for possible fertilization. This event is what characterizes ovulation.
4. (iv) Luteal phase of menstrual cycle is also called proliferative phase.
   • This is incorrect. The luteal phase occurs after ovulation, where the corpus luteum is active. The proliferative phase, on the other hand, is associated with the first half of the cycle, before ovulation, when the endometrial lining thickens in preparation for a potential pregnancy.

Based on these analyses, the correct statements are (i) and (iii), making the correct option:

(i) and (iii) are correct.