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Menstrual Cycle

How does the ...

Question

How does the entry of one sperm in the ovum block the entry of other sperms?

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Solution

During fertilization, the sperm induces changes in the membrane of ovum called zona pellucida and blocks the entry of other sperms. This ensures that only one sperm fertilizes an 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.

Q. After a sperm has penetrated in ovum during fertilisation, the entry of further sperms is prevented by

Q. Short / Long Answer question Type :
What envelops the mammalian ovum preventing the entry of sperm into it easily? How does the sperm gain the entry eventually?

Q. Where does fertilization take place in a woman? What helps the sperm to gain an entry into the ovum and how? What is the significance of the point of entry of the sperm?

Q. (a) Draw an electron microscopic view of a mammalian sperm. Label any six interhal structures of the sperm, (b) What do you call the area of an ovum from where the sperm makes its entry?, (c) Name the enzyme produced by the sperm to facilitate its entry, (d) List any two events taking place in an ovum just when sperm gains entry into it., (e) How does the entry of the sperm influence cell division of the secondary oocyte?

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