O-LevelBiologyCoordination & Response5090/12 · May/June 2021 · Q221 Mark

What happens in the eye to produce the pupil reflex to bright light? 1 ciliary muscle contraction 2 circular muscle contraction 3 radial muscle relaxation 4 suspensory ligaments pulled tight

A1 and 3

B1 and 4

C2 and 3

D2 and 4

✓ Correct answer

C: 2 and 3

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2021 Paper 1 Variant 2, question 22.

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