What is an ovum?

In the testis,the immature germ cells produce sperm by $...A...$ at puberty. $...B...$ present on the inside wall of seminiferous tubules multiply by $...C...$ division and increase their number. Identify $A$,$B$,and $C$ from the above statement.

$A$ temporary endocrine gland formed after ovulation in the ovary is:

After ovulation, the Graafian follicle transforms into which of the following?

The membrane investing the ovum just outside the membrana granulosa is

The following figure is a schematic representation of oogenesis. Which cells are $P$ and $Q$?
$\quad\quad\quad P\quad\quad\quad Q$