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The reproductive cycle in the female primates (e.g. monkeys, apes and human beings is called menstrual cycle. The first menstruation begins at puberty and is called menarche. In human females, menstruation is repeated at an average interval of about 28/29 days, and the cycle of events starting from one menstruaction till the next one is called the menstrual cycle. One ovum is released (ovulation) during the middle of each menstrual cycle.
(i) The ovulation occurs on _______ day and _________ surge is seen on that duration. (a) 6, LH (b) 12, LH (c) 14, LH (d) 21, LH(ii) On which day is the thickness of the Endometrium at its maximum? (a) 13th day (b) 14th day (c) 17th day (d) 23rd day(iii) Which hormone is necessary for the main-tenance of the endometrium ? (a) Prolactin (b) LH (c) Progesterone (d) Oxytocin(iv) Which of the following events indicates the beginning of the menstruation ? (a) LH Surge (b) Increase in estrogen levels (c) Decrease in the progesterone levels (d) Commencement of menstruation

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(i) (c) 14, LH (ii) (d) 23rd day (iii) (c) Progesterone (iv) (d) Commencement of menstruation