Question

What is formed by chorionic villi cooperating with the tissues of uterus of mother?

• A. Placenta
• B. Embryonic disc
• C. Umbilical cord
• D. Embryonic layer

Answer 1

The correct option is A Placenta

The chorion, which means as the membrane covering the fetus is the outermost extraembryonic membrane. The two types of cells namely cytotrophoblast cells and syncytiotrophoblast cells form chorion. These cells combine with the functional layer of the endometrium and form the placenta, which is the site of gas and nutrient exchange between the embryo and the mother. Hence, the correct answer is option A, Placenta.