CAIE IGCSE Biology 14.2.5 Pupil Reflex in Terms Questions
Practise using circular and radial iris muscles to explain how antagonistic action changes pupil size in different light levels.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- Infer which iris muscle contracts or relaxes in bright and dim light, and link this to pupil size.
- Identify circular and radial muscles as the opposing effectors in the pupil reflex.
- Name the antagonistic action of the iris muscle pair when one contracts and the other relaxes.
CAIE IGCSE Biology 14.2.5 Pupil Reflex in Terms Questions question 1
[Maximum number: 1]
The eye is a sense organ that is part of the nervous system.
State the names of the two effectors that contract and relax during the pupil reflex.
........ and ........
circular muscle and radial muscle ;
A in either order
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