O-LevelBiologyCoordination & Response5090/11 · May/June 2013 · Q221 Mark

The graph shows the changes in the size of the pupil of the eye as the light intensity of the surroundings is changed. [Figure showing a graph of diameter of pupil/mm vs. time/seconds, showing an increase then decrease in pupil size.] Between which times is the light intensity increasing?

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A5 to 10 seconds

B10 to 25 seconds

C25 to 35 seconds

D35 to 40 seconds

✓ Correct answer

D: 35 to 40 seconds

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2013 Paper 1 Variant 1, question 22.

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