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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