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Question

Extra structure which provides nutrition to embryo is

A
Umbilicus
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B
Chorion
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C
Placenta
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D
Amnion
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Solution

The correct option is B Placenta
After implantation, finger-like projections appear on the trophoblast called chorionic Villi which are surrounded by uterine tissue and maternal blood. The chronic villi and uterine tissue become interdigitated with each other and jointly form a structural and functional unit between developing embryo that is foetus and maternal body called placenta. Placenta facilitate the supply of oxygen and nutrients to the embryo and also helps in removal of carbon dioxide in excretory waste materials produced by the embryo.
So, the correct option is 'Placenta'.

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