O-LevelBiologyCoordination & Response5090/11 · Oct/Nov 2023 · Q251 Mark

A light was shone into a person's eye for 50 seconds. During this time, the intensity of the light was varied. The graph shows changes in the person's pupil size. Which statement explains the change in pupil size?

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AThe light slowly became brighter.

BThe light suddenly became brighter.

CThe light slowly became dimmer.

DThe light suddenly became dimmer.

✓ Correct answer

C: The light slowly became dimmer.

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2023 Paper 1 Variant 1, question 25.

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