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What ensures ...

Question

What ensures that only one sperm can fertilize the ovum?
A. Corona radiata
B. Ground substance around ovum
C. Zona pellucida
D. Acrosome

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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. The event which ensures that only one sperm fertilizes an ovum is:
[0.7 mark]

Q. How many sperms can fertilize one ovum?

Q. Differentiate between :
Zona pellucida and corona radiata

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

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