What begins to be produced in females at puberty?

The meiotic division of the secondary oocyte is completed at the time of ................

The first stage of $Graafian$ follicular growth involves:

Steroid hormone progesterone is secreted by the corpus luteum (a mass of cells in the ovary). Which of the following is correct for corpus luteum cells?

The immature stage of eggs is called as:

What does the head of a mature sperm consist of?