NEET 2010 Biology question

In human female the blastocyst

(1)Gets implanted in endometrium by the trophoblast cellsCorrect
(2)Forms placenta even before implantation
(3)Gets implanted into uterus 3 days after ovulation
(4)gets nutrition from uterine endometrial secretion only after implantation

Answer: (1)

Solution

The blastocyst consists of an outer layer of trophoblast cells and an inner cell mass. The trophoblast cells in contact with the endometrium attach to it and the blastocyst gets embedded (implanted) in the endometrium. Option (1) is correct. The placenta forms only

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Question ID VK-090423