O-LevelBiologyCoordination & Response5090/12 · Oct/Nov 2021 · Q211 Mark

The diagrams show the front view of the pupil and iris of the eye in different light intensities. [Figure 21.1] Which row correctly describes diagram X?

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Abright light, relaxed, contracted

Bbright light, contracted, relaxed

Cdim light, relaxed, contracted

Ddim light, contracted, relaxed

✓ Correct answer

C: dim light, relaxed, contracted

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2021 Paper 1 Variant 2, question 21.

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