O-LevelBiologyGenetics & Variation5090/12 · May/June 2023 · Q331 Mark

Which row describes the exchange of substances at the placenta?

Apassing from mother to fetus: carbon dioxide, glucose and alcohol, passing from fetus to mother: oxygen and urea

Bpassing from mother to fetus: carbon dioxide, nicotine and glucose, passing from fetus to mother: oxygen and urea

Cpassing from mother to fetus: oxygen and urea, passing from fetus to mother: carbon dioxide and glucose

Dpassing from mother to fetus: oxygen, glucose and antibodies, passing from fetus to mother: carbon dioxide and urea

✓ Correct answer

D: passing from mother to fetus: oxygen, glucose and antibodies, passing from fetus to mother: carbon dioxide and urea

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Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2023 Paper 1 Variant 2, question 33.

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