During the process of spermiogenesis,the heads of the sperm become embedded in which of the following cells?

Which of the following labelled parts produces energy for the movement of the tail that facilitates sperm motility essential for fertilisation?

What is the name of the structure formed after the rupture of the Graafian follicle?

In human females,at the time of birth,there are approximately $2$ million primary oocytes. How many of them normally reach maturity during the entire reproductive life of a female?

For normal fertility,what percentage of sperm in a human male ejaculate must have vigorous motility (in $\%$)?

How many spermatozoa are formed from one secondary spermatocyte?