Question
Biology Question on human reproduction
Fertilization membrane is formed in order to
A
Facilitate entry of sperm into egg
B
Provide stability to egg
C
Prevent monospermy
D
Prevent polyspermy
Answer
Prevent polyspermy
Explanation
Solution
Just after the fusion of sperm and plasma membranes of oocyte, the secondary oocyte shows a cortical reaction, The cortical granules are present beneath the .plasma membrane of the secondary oocyte, These granules fuse with the plasma membrane of athe oocyte and release their contents including cortical enzymes between? the plasma membrane and the zona pellucida. These enzymes harden the zona pellucida to form fertilization membrane which prevents entry of additional sperms (polysperrny),