In mammals,the egg is microlecithal and alecithal because they are.....

Which of the following is a female hormone?

Give differences between:
$(a)$ Testis and ovary
$(b)$ Sperm cell and ovum (egg) cell

Match the columns.

Column $I$	Column $II$
$(a)$ Mons pubis	$(1)$ Embryo development
$(b)$ Antrum	$(2)$ Sperm cell
$(c)$ Trophoblast layer	$(3)$ External genitals of female
$(d)$ Mitochondria	$(4)$ Graafian follicle

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.

Identify the correct labeling in the diagram of a human ovary.