A) Secretions of acrosome helps only one sperm to enter cytoplasm of ovum through zona pellucida
B) All sperms except those nearest to the ovum lose their tails
C) Cells of corona radiata trap all the sperms except one
D) Only two sperms nearest to the ovum penetrate zona pellucida
Correct Answer: A
Solution :
[a] During fertilisation in humans, many sperms reach close to the ovum. As sperm comes in contact with the zona pellucida layer of the ovum, it induces changes in the membrane that blocks the entry of additional sperm. The secretions of acrosome helps one sperm to enter the cytoplasm of ovum through zona pellucida.
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