In which of the following are haploid chromosomes found?

Massive amount of yolk present in the vegetal region of the egg makes an egg:

Which of the following cell organelles is involved in the formation of the acrosome in sperm?

$A$ : The most immediate effect of $FSH$ is the maturation of existing late primary or secondary follicle.
$R$ : $A$ rising level of $FSH$ causes the developing egg within the follicle to complete the first meiotic division to form a secondary oocyte.

Arrange in the correct sequence the structures formed during spermatogenesis:
$(a)$ Spermatogonia
$(b)$ Secondary spermatocyte
$(c)$ Primary spermatocyte
$(d)$ Spermatid

Identify $A, B, C, D$ and $E$ in the given figure of a human sperm.