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O-LevelBiologyCoordination & Response5090/11 · May/June 2020 · Q211 Mark

Which statements describe the pupil reflex in bright light? 1 ciliary muscles contract 2 ciliary muscles relax 3 circular iris muscles contract 4 circular iris muscles relax 5 lens becomes rounder 6 lens becomes thinner 7 pupil constricts 8 pupil dilates 9 radial iris muscles contract 10 radial iris muscles relax

A1, 6 and 9
B2, 5 and 10
C3, 7 and 10
D4, 8 and 9

✓ Correct answer

C: 3, 7 and 10

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About this question

Topic
Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source
O-Level Biology, May/June 2020 Paper 1 Variant 1, question 21.

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