Multiple choice Which of the following functions is NOT served by placenta for developing embryo? Respiration Immunity Excretion Nutrition Control and Co-ordination Reveal answer Fill a bubble to check yourself E Correct answer Explanation Placenta provides nutrition to the embryo and also removes waste material. Exchange of gases occurs through placenta. Placenta also provides certain antibodies for immunity. However, placenta has no role in controlling and coordinating embryo.