O-LevelBiologyTransport in Humans5090/12 · May/June 2023 · Q221 Mark

When babies are born, they have some passive immunity. Which conditions are needed for passive immunity to develop?

AAntibodies produced by the mother have crossed the placenta.

BThe baby has developed in a very sterile environment.

CThe baby has not yet been vaccinated or exposed to disease.

DThe mother's diet is good enough for the baby to produce its own antibodies.

✓ Correct answer

A: Antibodies produced by the mother have crossed the placenta.

Oracle Prep sorts past-paper questions by topic, so you can drill Transport in Humans and see which topics are most likely to come up next.

Topic: Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2023 Paper 1 Variant 2, question 22.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content