Which one takes part in formation of placenta?

Only trophoblast

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Only allantois

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Trophoblast and mesoderm

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Trophoblast, mesoderm and allantois

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Solution

The correct option is C Trophoblast, mesoderm and allantois
Trophoblasts are cells forming the outer layer of a blastocyst , which provide nutrients to the embryo and develop into a large part of the placenta.
It is formed by extraembryonic mesoderm and the two layers of trophoblast that surrounds the embryo and other membranes.
The allantois is responsible for the induction of placental development. It form arteries and veins.
So, the correct answer is 'Trophoblast, mesoderm and allantosis'

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