A)
Developmental stage Site of occurrence Late morula Middle part of fallopian tube
B)
Developmental stage Site of occurrence Blastula End part of fallopian tube
C)
Developmental stage Site of occurrence Blastocyst Uterine wall
D)
Developmental stage Site of occurrence 8-celled morula Starting point of fallopian tube
Correct Answer: C
Solution :
An embryo with about 64-cells and a cavity called blastocoel is known as blastocyst. It is composed of an outer envelope of cells the trophoblast. Implantation is attachment of blastocyst to the uterine wall. This occurs 7-days after fertilization. It develops from 8-celled morula to 16-celled morula and then 64-celled stage. The blastocyst sinks into a pit formed in the endometrium and gets completely burried in the endometrium.
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