Learning objective

Clarify the pupil reflex in relation to variations in light intensity and the resulting changes in pupil size.

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Exam focus

Cambridge IGCSE BiologyCoordination and responseCore content

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Quick explanation

This point belongs to Sense organs, especially Sense organs outcomes.
You need to be able to clarify the pupil reflex in relation to variations in light intensity and the resulting changes in pupil size.
The key ideas to know are Explain.
Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Explain

Why it matters

This objective helps connect Sense organs outcomes to exam-style questions, flashcards, and revision notes for Sense organs.

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Practice Questions7 linked questions

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Paper 3Theory (Core)3 marks

Description

When a person moves from a dark room to a bright room, the pupil size changes automatically.

a
State what happens to the pupil size when light intensity increases?
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Explain how the pupil reflex protects the eye when moving into bright light.
Your answer
Aim for approximately 2 distinct marking points.
[2]

Revision notestopic notes

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