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The ovum is surrounded by four membranes...

The ovum is surrounded by four membranes. How can a sperm enter and fuse with the female pronuclei?

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Sperm produces antifertilizin, sperm lysin etc. to break the membranes of the ovum.
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NEW JOYTHI PUBLICATION-HUMAN REPRODUCTION -NEW EVALUATION
  1. Copy the diagram. Identify and label any five parts.

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  2. During ovulation only one ovum is produced. But doing one ejaculation ...

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  3. Find out the correct sequence from below. a. Fertilisation to zygote...

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  4. The ovum is surrounded by four membranes. How can a sperm enter and fu...

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  5. Observe the diagrams and answer the questions that follow. a. Giv...

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  6. During cleavage of the mammalian zygote, the resultant blastomeres bec...

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  7. A human ovum is released on the 14th day of menstrual cycle. a. Wha...

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  8. A connection between foetal membrane and uterine wall is known as plac...

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  9. The germ layers are given. Complete the organs derived from the germ l...

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  10. A woman has conceived and implantation occurred within her uterus. Dis...

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  11. A fertilised egg is a blue print for future development. Justify the s...

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  12. Amnion is an effective shock absorber. Comment on it.

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  13. First trimester of pregnancy is critical. Give reason.

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  14. Find the odd one out in each group and justify. a.Vasa efferentia, e...

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  15. Observe the diagram. a. Where is this event taking place? b. Wr...

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  16. Change in nucleus, acrosome formation, changes in mitochondria, centri...

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  17. The relaxin secreted by placenta relaxes the pubic ligaments during pa...

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  18. Observe the flowchart showing the hormonal control of Menstrual cycle ...

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  19. The diagram of human blastocyst is given below . a.Identify A and...

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  20. A concept map showing the filtration between glomerulus and Bowman's c...

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