Antifertilizins are contained in

Which statement is correct regarding fertilization?

Assertion : During fertilization,only the head of the spermatozoa enters the egg.
Reason : If several spermatozoa hit the egg at the same time,all can enter the egg.

During cleavage,$DNA$ synthesis is:

Which of the following statements is true regarding the process of fertilization?

What helps in the penetration of the egg by the sperm?