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

Female gametes are also called

An axial filament in the tail of sperm is modified . . . . . . .

In the given diagram, choose the correct option for the labels $X$, $Y$, and $Z$.

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?

Who discovered human sperm?