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2.4 The eye

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Question 18

A cyclist stops to check a cycle computer in daylight. Two changes then occur separately.

R concerns the radial iris muscles when cloud cover makes the surroundings dimmer while the cyclist continues looking at the cycle computer.

S concerns the suspensory ligaments when the cyclist looks from the cycle computer to a distant road sign while the light intensity remains constant.

Which combination describes R and S?

[1]
A

R: radial iris muscles contract; S: suspensory ligaments are pulled tight

B

R: radial iris muscles relax; S: suspensory ligaments slacken

C

R: radial iris muscles relax; S: suspensory ligaments are pulled tight

D

R: radial iris muscles contract; S: suspensory ligaments slacken

Markscheme

2.4 The eye Questions

  1. GCSE
  2. /Biology
  3. /2.4 The eye

102 exam-style questions on Edexcel GCSE Biology 2.4 The eye, covering 2.4.1 Structure and function of the eye and 2.4.2 Eye defects and their correction. Each one has a worked solution and a mark scheme showing where the marks go.

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