The middle piece of a mammalian sperm contains:

Immediately after ovulation,the mammalian egg is covered by a membrane. What is this membrane called?

An unfertilized human egg contains

The unfertilized egg of a human contains,or when released from the ovary,the human egg contains:

How many structures in the list given below are haploid? Spermatid,secondary oocyte,primary spermatocyte,ovum,sperm,oogonia,spermatogonia,polar body.

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.