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Ovum Structure

In human, dur...

Question

In human, during fertilisation, a sperm firstly comes in contact with which layer of the ovum.

A

Zona pellucida

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B

Vitelline membrane

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C

Jelly coat

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D

Corona radiata

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Solution

The correct option is D
Corona radiata

Corona radiata is cellular layer around a mature ovum. Sperm has to penetrate through this by using hyaluronidase enzyme to reach up to zone pellucida membrane, which is acellular.

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Similar questions

Q. In human during fertilisation a sperm firstly comes in contact with which layer of ovum?

Q. (a) Draw a diagram of the structure of a human ovum surrounded by corona radiata. Label the following parts:
(i) Ovum (ii) Plasma Membrane (iii) Zona Pellucida
(b) State the function of Zona Pellucida.

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

Q. Differentiate between :
Zona pellucida and corona radiata

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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