O-LevelBiologyCoordination & Response5090/12 · Oct/Nov 2017 · Q221 Mark

A person is reading a book in dim light. Which row shows the state of the eye muscles? [Figure 22.1]

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Aciliary muscles: contracted, iris circular muscles: contracted, iris radial muscles: relaxed

Bciliary muscles: contracted, iris circular muscles: relaxed, iris radial muscles: contracted

Cciliary muscles: relaxed, iris circular muscles: contracted, iris radial muscles: relaxed

Dciliary muscles: relaxed, iris circular muscles: relaxed, iris radial muscles: contracted

✓ Correct answer

B: ciliary muscles: contracted, iris circular muscles: relaxed, iris radial muscles: contracted

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2017 Paper 1 Variant 2, question 22.

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