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Diagram-A
Diagram-B
(i) What is the increased level of LH on 14th day known as in diagram-A?
(ii) As shown in diagram-B, why is the increased level of progesterone is necessary after 14th day?
(iii) What is the duration for menstruation, the proliferative phase, luteal phase?
(iv) As shown in diagram-A, what changes take place during day 6 to 13 due to increased level of estrogen?

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(i) LH surge at the 14th day represents Ovulation. (ii) The Increased level of Progesterone after 14th day maintains the endometrium.
(iii) Menstruation – Day 3 to 5 Follicular phase – Day 6 to 13 Luteal phase – Day 15 to 28 (iv) The increased level of estogen