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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 enter cytoplasm of ovum through zona pellucida.

1. (a) During fertilisation in humans, many sperms reach close to the ovum.
2. (b) As sperm comes in contact with the zona pellucida layer of the ovum it induces changes in the membrane.
3. (c) The secretions of acrosome helps one sperm enter cytoplasm of ovum.
4. (d) The zona pellucida supports communication between oocytes and follicle cells.

Correct answer: (c) The secretions of acrosome helps one sperm enter cytoplasm of ovum.

Solution

The acrosome contains enzymes that help a sperm digest the coverings of the ovum, allowing entry into the cytoplasm. The other statements describe surrounding events or unrelated functions of the zona pellucida.

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