When pregnancy does not occur,the life of the | vedclass

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(B) In the human female,the menstrual cycle lasts for approximately $28$ days. After ovulation,which typically occurs on the $14$th day,the remaining

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$14$ days

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(B) In the human female,the menstrual cycle lasts for approximately $28$ days. After ovulation,which typically occurs on the $14$th day,the remaining follicle transforms into the corpus luteum. The corpus luteum secretes large amounts of progesterone,which is essential for the maintenance of the endometrium. If fertilization does not occur,the corpus luteum degenerates after about $14$ days,leading to a decrease in progesterone levels and the subsequent shedding of the endometrium (menstruation).

Column $I$	Column $II$
$(a)$ $6-14$ days	$(1)$ Menstrual phase
$(b)$ $1-5$ days	$(2)$ Polar body formation
$(c)$ $15-28$ days	$(3)$ Proliferative phase
	$(4)$ Secretory phase (Endometrium is prepared for implantation)

When pregnancy does not occur,the life of the corpus luteum is about

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Column $I$ Column $II$

$(a)$ $6-14$ days $(1)$ Menstrual phase

$(b)$ $1-5$ days $(2)$ Polar body formation

$(c)$ $15-28$ days $(3)$ Proliferative phase

$(4)$ Secretory phase (Endometrium is prepared for implantation)

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