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In human famale the blastocyst...

In human famale the blastocyst

A

Forms placenta even before implantation

B

Gets implanted into uterus 3 days after ovulation

C

Gets nutrition from uterine endometrial secretion only after implantation

D

Gets implanted in endometrium by the trophoblast cells

Text Solution

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The correct Answer is:
D
Before implantation the cells of blastocyst are grouped into an outer layer called trophoblast and inner layer called inner cells mass. It is the trophoblast layer that helps in the formation of extra embryonic layer and inner cell mass gets differentiated as the embryo.
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