Describe the location and function of the following: Placenta and Acrosome.

Which of the following groups represents a pair of similar structures or functions?

Fertilisation of an egg cell means......
$(1)$ End of the process of oogenesis
$(2)$ Induces the completion of the second meiotic division
$(3)$ The corpus luteum degenerates
$(4)$ Signals for maintaining progesterone levels in the blood
$(5)$ Formation of a zygote

If the number of chromosomes in most body cells of a mammal is $40$,the cells in the seminiferous tubule will have

Match the hormones given in List-$1$ with their functions given in List-$2$.

List-$1$	List-$2$
$(a)$ Oxytocin	$(p)$ Stimulates ovulation
$(b)$ Prolactin	$(q)$ Maintenance of implantation and pregnancy
$(c)$ Luteinizing hormone	$(r)$ Milk secretion after childbirth
$(d)$ Progesterone	$(s)$ Uterine contraction during parturition
	$(t)$ Reabsorption of water by nephrons

Given below are two statements.
Statement $I$: Mule is an intergeneric sterile hybrid.
Statement $II$: Mule is sterile due to failure of proper gametogenesis.
In the light of the above statements,choose the most appropriate answer from the options given below.