Spermatogenesis is regulated by which of the following?

Which of the following events is not associated with ovulation in human female?

What happens to sperm at $0^{\circ}C$ temperature?

In a mesolecithal egg,one would expect:

Given below are two statements :
Statement-$I$ : Each primary oocyte gets surrounded by a layer of granulosa cells and is called a primary follicle.
Statement-$II$ : At puberty,only $60,000-80,000$ primary follicles are left in each ovary.
In the light of the above statements,choose the most appropriate answer from the options given below :

If a germ cell in a female gonad and a germ cell in a male gonad begin undergoing meiosis simultaneously,what will be the ratio of ova and sperms produced?