O-LevelBiologyCoordination & Response5090/11 · Oct/Nov 2010 · Q231 Mark

The graph shows how the diameter of the pupil of a person's eye changed during the course of two minutes. [Graph] What happens to the light intensity at X and which muscles begin to contract? [Table]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Adecreases circular

Bdecreases radial

Cincreases circular

Dincreases radial

✓ Correct answer

B: decreases radial

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2010 Paper 1 Variant 1, question 23.

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