Question 2
Under the influence of which hormone does a primary follicle develop as far as the Graafian follicle?
The right answer is the one marked above.
FSH, from the pituitary gland. This is the follicular phase, and it takes about 14 days.
LH comes next, and it bursts the follicle rather than growing it. Oestrogen is secreted by the ovary during this same phase — it is the ovary's reply, not the instruction that started the phase.