After ovulation,what does the Graafian follicle transform into?

How many spermatozoa are produced from a single secondary spermatocyte?

Spermatogonia undergo a series of cell divisions to produce sperms. Select the correct statements from the following:
$A$. Spermatogonia always undergo meiotic cell division.
$B$. Primary spermatocytes divide mitotically to produce secondary spermatocytes.
$C$. Secondary spermatocytes, through their second meiotic division, produce spermatids.
$D$. Spermatids produce spermatozoa through mitosis.
$E$. Spermatids transform into spermatozoa by spermiogenesis.
Choose the correct answer from the options given below:

At the end of the first meiotic division,the male germ cells differentiate into

Sertoli cells are regulated by the pituitary hormone known as

Describe the process of oogenesis.