WAEC Biology 2014 Objective — Question 18

Question 18 of 50 from the West African Examinations Council (WAEC) Biology 2014 Objective paper, with the correct answer and a full explanation.

The following substances pass into the blood of the foetus from the mother's blood via the placenta except

A. carbon dioxideCorrect
B. glucose
C. viruses
D. antibodies

Explanation

The placenta carries oxygen, water and food from the mother's blood to the embryo's blood; it also removes excretory wastes like urea, salt, and carbon dioxide from the embryo's blood and puts it into the mother's blood for elimination. Carbon dioxide moves from the foetus to the mother, not the reverse.

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