Fertilisation — Prelims Questions

Which of the following events occurs earliest during human fertilisation?

The zona pellucida is penetrated by sperm due to the action of which enzyme?

Which of the following is a direct consequence of sperm entry into the ovum?

Which of the following statements about the cortical reaction is INCORRECT?

The fusion of male and female pronuclei is known as:

If fertilisation fails to occur after ovulation, what happens to the secondary oocyte?