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3.1 Coordination and control – the nervous system

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Question 22

A pupil diameter was measured after the eye had adjusted to each light level.

Light level (lux)Pupil diameter (mm)
1006.0
8002.5

Explain how the iris brings about the change in pupil diameter shown in the table, and how this change helps to protect the eye.

[3]
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3.1 Coordination and control – the nervous system Questions

  1. GCSE
  2. /Biology
  3. /3.1 Coordination and control – the nervous system

135 exam-style questions on OCR GCSE Biology 3.1 Coordination and control – the nervous system, covering 3.1.1 Structure of the nervous system, 3.1.2 Coordinated response, 3.1.3 The reflex arc, 3.1.4 Structure of the eye, 3.1.5 Defects of the eye, 3.1.6 Structure and function of the brain, 3.1.7 Difficulties of investigating brain function, and 3.1.8 Limitations in treating nervous system damage. Each one has a worked solution and a mark scheme showing where the marks go.

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