The sperm produces substances of enzymatic nature called sperm lysin. In mammals,it is called

Which hormone controls the secretion of estrogen?

How many sperms are formed by four primary spermatocytes?

In humans,what is the ratio of the number of gametes produced from one male primary sex cell to the number of gametes produced from one female primary sex cell?

The testes of a great majority of mammals are typically enclosed in an extra-abdominal sac,the scrotum. The temperature inside the scrotum is lower than that in the abdomen. What will happen if the temperature of the scrotum is artificially maintained at the level of abdominal temperature?

What does a human ovum contain?