Question

A. explain the role of placenta in the development of human embryo . B . give example of 2 bacterial and viral std C. name the most effective contraceptive which prevent spread of such diseases

Answer 1

A. Disc shaped structure embedded on the uterine wall. Helps to increase surface area to pass oxygen and glucose from mother's body to the embryo. Also removes the waste generated by embryo.

B. Bacteria - gonnorhoea and syphilis

Virus - warts and AIDS

C. Barrier methods like IUCDs in women.

Answer 2

A. placenta provide oxygen and other nutrients to the embryo it is the joint structure between mother uterus to embryo