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How is the entry of only one sperm and n...

How is the entry of only one sperm and not many ensured into an ovum during fertilization in humans?

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Because after the entry of one sperm in ovum, polyspermy is prevented by depolarization of egg membrane and formation of fertilization membrane
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Assertion: Only one sperm can fertilise an ovum. Reason: During fertilisation, a sperm comes in contact with zona pellucida layer of the ovum and induces changes in the membrane that blocks the entry of additional sperms.

MODERN PUBLICATION-HUMAN REPRODUCTION-REVISION EXERCISES (VERY SHORT ANSWER TYPE QUESTION (B)QUESTIONS FROM CBSE EXAMINATIONS)
  1. What is corona radiata?

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  2. Why is oxytocin called "birth hormone" ?

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  3. Which germ layer forms CNS?

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  4. From which germ layer do the following organs differentiated (i) K...

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  5. At what stage of development, does the human embryo gets implanted to ...

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  6. What is trophoectoderm?

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  7. What are morphogenetic movements?

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  8. What term is used for the chemical which occurs in the sperm's acrosom...

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  9. What does the blastocoel of a mammalian embryo phylogenetically signif...

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  10. Where does fertilization normally take place in a human female?

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  11. In the whiptail lizards only females are born generation after generat...

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  12. At what stage of life is cogenesis initiated in a human female? When d...

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  13. Name the embryonic stage that gets implanted in the uterine wall of a ...

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  14. Name the phase all organisms have to pass through before they can repr...

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  15. Write the location and function of the sertoli cells in humans.

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  16. When do the oogenesis and the spermatogenesis initiate in human female...

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  17. Mention the difference between spermiogenesis and spermiation.

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  18. Where is acrosome present in humans? Write its function.

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  19. How is the entry of only one sperm and not many ensured into an ovum d...

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  20. Identify the figure given below and the part labelled "A"

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