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What is placenta? Mention its role durin...

What is placenta? Mention its role during pregnancy?

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Placenta is a disc-like structure in the lining of the uterine wall. It contains villi on the embryo.s side of the tissues and blood spaces on the mother.s side surround the villi. The embryo is connected to the placenta by a tube called the umbilical cord. Role during pregnancy is through the placenta that all the requirements of the developing foetus are met. The villi provide a large surface area that facilitate passage of nutrition and oxygen to embryo from mother through blood. Waste substances produced by embryo are removed through placenta into mother.s blood.
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OSWAL PUBLICATION-REPRODUCTION-NCERT EXEMPLAR (SHORT ANSWER QUESTIONS)
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  2. Where is the zygote located in the flower after fertilisation?

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  3. Reproduction is linked to stability of population of a species. Justif...

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  4. How are general growth and sexual maturation different from each other...

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  5. Trace the path of sperm during ejaculation and mention the gland and t...

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  6. What changes are observed in the uterus if fertilisation does not occu...

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  7. What changes are observed in the uterus subsequent to implantation of ...

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  8. What are the benefits of using mechanical barriers during sexual act?

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  9. In the given figure label the parts and mention their functions (a)P...

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  10. What would be the ratio of chromosome number between an egg and its zy...

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  11. Why are budding, fragmentation and regeneration all considered as asex...

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  12. Write two points of difference between asexual and sexual types of rep...

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  13. Distinguish between pollination and fertilisation. Mention the site an...

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  14. Distinguish between a gamete and zygote. Explain their roles in sexual...

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  15. Draw the diagram of a flower and label the four whorls. Write the name...

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  16. What is placenta? Mention its role during pregnancy?

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  17. What are various ways to avoid pregnancy? Elaborate any one method.

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  18. How does fertilisation take place? Fertilisation occurs once in a mont...

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  19. Reproduction is essentially a phenomenon that is not for survival of a...

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  20. Describe sexually transmitted diseases and mention the ways to prevent...

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