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a) Explain the terms: i) Implantation ...

a) Explain the terms:
i) Implantation
ii) Placenta
b) What is the average duration of human pregancy?

Text Solution

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a) i) Implantation : The embedding of a fertilised mammalian egg (embryo) into the inner thick wall of the uterus (womb) Where it will continue its development is called implantation.
ii) Placenta : It is a complex double-layered spongy vascular tissue in human female formed by the joint activity ofmaterial and foetal tissues in the wall of uterus that is meant for attachment, nourishment and waste disposal for the foetus.
b) The average duration of humans pregnancy is 40 weeks or 280 days.
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CPC CAMBRIDGE PUBLICATION-HOW DO ORGANISMS REPRODUCE ?-ADDITIONAL QUESTIONS (Answer the following questions)
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  2. What are the advantages of autogamy or self pollination ?

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  3. Does cell dividion play an important role in reproduction ?

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  4. What is crucial function of cell division?

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  5. Give an example cell division occurs in human body for continuity of l...

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  6. What happens if fallopian tube is blocked ?

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  7. What are the type of cell division ? Give examples of each.

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  8. i) What is fertilisation ? Distinguish between external fertilisation ...

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  9. Define the terms unisexual and bis exual giving one example of each.

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  10. Mention the mode reproduction used by a) Amoeba" " b) Planaria

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  11. Name the information source of making protiens in the cell. State two ...

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  12. a) Explain the terms: i) Implantation ii) Placenta b) What is th...

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  13. What is AIDS.? Which microbe is responsible for AIDS infection ? Stace...

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  14. How does growing embryo get nutrition from the mother's blood ?

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  15. a) List any four reasons for adopting contraceptive methods. b) If...

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  16. Draw a diagram showing germination of pollen on, stigma of a flower.

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  17. Is cell division a controlled process? If not what would happen?

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  18. Write the full form of IUCD.

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  19. What are different types of grafting techniques.

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  20. Where does the zygote get implanted in human beings ?

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