O-LevelBiologyCoordination & Response5090/12 · Oct/Nov 2022 · Q231 Mark

When a bright light is shone into the eye, the pupil becomes smaller. Which statement explains this response?

ACiliary muscles in the eye contract.

BCircular muscles in the iris contract.

CSensory cells in the iris detect the bright light.

DSensory neurones stimulate the ciliary muscles in the iris.

✓ Correct answer

B: Circular muscles in the iris contract.

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2022 Paper 1 Variant 2, question 23.

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