O-LevelBiologyCoordination & Response5090/11 · May/June 2023 · Q221 Mark

What are the effects of the human immunodeficiency virus (HIV) on the immune system?

Aimmune system: becomes weaker, antibody production: decreases, number of lymphocytes: decreases

Bimmune system: becomes weaker, antibody production: increases, number of lymphocytes: increases

Cimmune system: becomes stronger, antibody production: decreases, number of lymphocytes: decreases

Dimmune system: becomes stronger, antibody production: increases, number of lymphocytes: increases

✓ Correct answer

A: immune system: becomes weaker, antibody production: decreases, number of lymphocytes: decreases

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2023 Paper 1 Variant 1, question 22.

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