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What happens during fertilisation in humans after many sperms reach close to the ovum?

  1. A
    Cells of corona radiata trap all the sperms except one.
  2. B
    Only two sperms nearest the ovum penetrate zona pellucida.
  3. C
    Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida.
  4. D
    All sperms except the one nearest to the ovum lose their tails.

Solution & Step-by-step Explanation

The acrosome of the sperm secretes enzymes (like hyaluronidase and acrosin) that help it penetrate the corona radiata and the zona pellucida to enter the egg's cytoplasm.

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What happens during fertilisation in humans after many sperms reach close to the ovum?
A
Cells of corona radiata trap all the sperms except one.
B
Only two sperms nearest the ovum penetrate zona pellucida.
C
Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida.
D
All sperms except the one nearest to the ovum lose their tails.

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Human Reproduction

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