CBSE Class 10 Science 2020 · Paper 31(B) · Question 20
What is placenta ? List its two roles during pregnancy.
Answer
The placenta is a disc-shaped tissue in the uterine wall that brings nutrition and oxygen to the embryo and removes its wastes.
The placenta is a special disc-shaped tissue embedded in the uterine wall which connects the embryo to the mother. It has villi on the embryo's side, surrounded by blood spaces on the mother's side.
Two roles during pregnancy:
1. It provides nutrition (glucose) and oxygen from the mother's blood to the embryo.
2. It removes the waste substances produced by the embryo by transferring them into the mother's blood.
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