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Science · 2024 · 3 marks
CBSE 2024 · Region 2 · Set 1 · Q30
Explain the events that take place once a sperm reaches the oviduct till it becomes a foetus. Write the role of placenta in pregnancy.
Explain the events that take place once a sperm reaches the oviduct till it becomes a foetus. Write the role of placenta in pregnancy.
Marking-scheme solution
In the oviduct, sperm encounters the egg and fertilisation takes place.
The fertilized egg (zygote) starts dividing and forms a ball of cells or
embryo.Embryo is implanted in the lining of the uterus, where it continues to grow and develops organs to become a foetus.
Role of Placenta:
(i) Provides a large surface area for glucose and oxygen to pass from the mother to the embryo.
(ii) Waste generated by the embryo will be removed by transferring them into the mother's blood.
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.