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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 nearest 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

Correct answer: Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida

Solution

During fertilisation, enzymes from the acrosome help a single sperm digest its way through the zona pellucida and enter the ovum. This triggers changes that prevent other sperms from entering.

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