65. What happens during fertilisation in humans after many sperms reach close to the ovum?
1)Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
2)All sperms except the one nearst to the ovum lose their tails
3)Cells of corona radiata trap all the sperms except one
4)Only two sperms nearest the ovum penetrate zona pellucida
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1) secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane.
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during fertilisation,asperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of addition sperms.
Where in this ensures thai only one sperm can fertilise an ovum.
Option - 1 is correct.
Secretion of acrosome helps one sperm enter cytoplasm of ovum thorough zona pellucida.
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