Question

What helps in the penetration of egg by the sperm [MP PMT 1992]
A) Fertilizin
B) Antifertilizin
C) Sperm lysin
D) Fertilization membrane

Answer 1

Sperm Lysin is the answer.

Sperm lysin is one of the enzymes that a sperm secretes when it comes in contact with the egg (ovum) that will be fertilized. The sperm's head does secrete it. 

These enzymes dissolve the tough outer membrane of the egg. Then sperm is able to penetrate into the egg and fertilize it properly forming a good zygote.