Q. Chorionic villi are formed by the modification of
A) Outer layer of trophoblast
B) Inner layer of trophoblast
C) Inner mass cell
D) Blastocyst
Explanation
Chorionic villi is the modification of outer trophoblast layer of blastocyst, which get attached to the endometrium of uterus. This is called implantation
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.