A) Blastulation
B) Gastrulation
C) Implantation
D) Cleavage
Correct Answer: C
Solution :
Implantation, a process of attachment of blastocyst on endometrium of utreus, is initiated by secretion of trophoblast. Soon after the attachment of blastocyst, endometrium around the embryo show the first sign of decidual cell reaction. The decidual cells form an implantation chamber around embryo and help in nutrition to embryo before the formation of functional placenta. The trophoblast developed from the layer of morulla stage and the process of implantation by its proteolytic enzymes.
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