A) forms placenta even before implantation
B) gets implanted into uterus three days after ovulation
C) gets nutrition from uterine endometrial secretion only after implantation
D) gets implanted in endometrium by the trophoblast cells
Correct Answer: D
Solution :
Implantation is the attachment of blastocyst to the uterine wall (endometrium). It occurs after 6-7 days of fertilization. During implantation, the trophoectoderm (trophoblast) comes in contact with the endometrium of the uterus and sinks into a pit formed in the endometrium and get completely hurried in the endometrium. Trophoblast cells form specialized structures called villi, which help in absorption of nutrient materials.
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