After ovulation,the mammalian ovum is surrounded by which of the following layers?

Identify the cells representing $P$,$Q$,$R$,and $S$ in the given schematic representation of spermatogenesis.

During oogenesis in females,the primary oocyte remains arrested for a long period in which stage?

Given below are four statements $(A - D)$ each with one or two blanks. Select the option which correctly fills up the blanks in two statements:
$A.$ The human male ejaculates about $(i)$ $200-300$ million sperms during a coitus. Out of which, for normal fertility at least $(ii)$ $60$ percent sperms must have normal shape and size.
$B.$ $A$ primary spermatocyte completes $(i)$ first meiotic division leading to the formation of two equal haploid cells called $(ii)$ secondary spermatocytes.
$C.$ Spermatogenesis starts at the age of $(i)$ puberty due to significant increase in the secretion of $(ii)$ $GnRH$, a hypothalamic hormone.
$D.$ Oogenesis is initiated during embryonic development and at puberty only $(i)$ $60,000-80,000$ primary follicles are left in each ovary.

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

How many polar bodies are produced during the process of oogenesis in a human female?