The menstrual cycle in a normal adult woman is of (in $days$)

In the $28$ day human ovarian cycle,the ovulation takes place typically on

$A$ woman with a typical $28 \; \text{day}$ menstrual cycle is most likely to become pregnant as a result of sexual intercourse on which days of the cycle?

Which one of the following is least present in the endometrium during the proliferative phase of the menstrual cycle?

Match the columns.

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)

During the menstrual cycle,cyclical changes take place in: