What are the functions of the testes in a young male?

Mention one function each of the following parts with respect to the female reproductive system:
$(a)$ Vagina
$(b)$ Ovary

The correct sequence of organs in the male reproductive system for the transport of sperms is:

What happens if the egg is not fertilized?

Why is the temperature of the scrotal sac $2\,^{\circ}C$ less than the body temperature?

$(a)$ Name the parts labelled as $A, B, C$ and $D$ in the diagram given below:
$(b)$ What is pollination? State its significance.
$(c)$ How does fertilization occur in flowers? Name the parts of the flower that develop into $(i)$ seed,and $(ii)$ fruit after fertilization.