CAIE IGCSE Biology 14.2.4 Pupil reflex
Practise explaining how the pupil reflex changes pupil diameter when light intensity changes between bright and dim conditions.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- predict pupil size when a person moves between bright light and darkness
- describe pupil constriction in bright light using the iris and muscle changes
- interpret diagrams showing iris and pupil appearance under different light intensities
14.2.4—Pupil reflex question 1
[Maximum number: 1]
A person moves from bright light into a dark room.
What changes occur in their eyes?
pupil
radial muscles
circular muscles
constricts
contract
relax
constricts
relax
contract
dilates
contract
relax
dilates
relax
contract
C
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