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Cambridge IGCSE Biology practice

What triggers the pupil reflex?

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Show answerSense organs revisionRevise the key idea

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MCQ

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cambridge_mcq

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Topic

Sense organs

Exam-style question

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What triggers the pupil reflex?.

  1. A.Sound intensity
  2. B.Light intensity
  3. C.Temperature changes
  4. D.Eye movement

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Paper 3 structured question: Sense organs

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Description

Pupil Reflex

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

  1. a

    State what happens to the pupil size when light intensity increases?

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Explain how the pupil reflex protects the eye when moving into bright light.

    Aim for approximately 2 distinct marking points.

    [2]