Question

Human placenta is formed by

• A. Chorionic villi
• B. Both A and C
• C. Uterine tissue
• D. Umbilical cord

Answer 1

The correct option is B Both A and C

Formation of placenta
Formation of the placenta involves the following steps:

• After implantation, finger-like projections appear on the trophoblast called chorionic villi.
• Chorionic villi are surrounded by the uterine tissue and the maternal blood.
• The chorionic villi and uterine tissue become interdigitated with each other and jointly form a structural and functional unit between the developing embryo and maternal body called the placenta.

Final answer:

(d) Both A and C