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CAIE IGCSE Biology 14.2.8 Functions of Rods & Cones

Practise comparing rods and cones by sensitivity, night vision, colour vision and response to different light intensities.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • state that rods are more sensitive in dim light and provide night vision without colour
  • state that three cone types absorb different colours of light for colour vision
  • justify a greater rod proportion in nocturnal animals using low-light sensitivity

14.2.8—Function of rods and cones question 1

[Maximum number: 4]

The eye is adapted for focusing on near and distant objects.
Fig. 3.1 shows the parts of the eye involved in focusing. The eye is focused on a distant object.

Fig. 3.1

Fig. 3.1

Rods and cones are the receptors in the retina of the eye.

Describe the functions of rods and cones in the eye.

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