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What Is Fertilisation?

The changes i...

Question

The changes in which layer or membrane of ovum check the entry of additional (more than one) sperms?

A

Zona pellucida

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B

Trophoblast

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C

Blastomer

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D

Placenta

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Solution

The correct option is A
Zona pellucida

The zona pellucida layer of the ovum shows certain changes after the penetration of sperm and thus checks the entry of additional sperms.

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Q. Fill up the blanks in the following paragraph by selecting the correct option.
During copulation (coitus), semen is released by the penis into the vagina and is called (i) . The ovum released by the ovary is transported to the (ii) where (iii) takes place. During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of (iv) . The secretions of the (v) help the sperm enter into the cytoplasm of the ovum.

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Q. When a sperm comes in contact with zona pellucida of the ovum, it prevents the entry of other sperms.

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What Is Fertilisation?

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