Explain the events that take place once a sperm reaches the oviduct till it becomes a foetus. Write the role…
Explain the events that take place once a sperm reaches the oviduct till it becomes a foetus. Write the role of placenta in pregnancy.
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.