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CAIE IGCSE Biology 14.2.7 Distribution of Rods & Cones

Practise describing rod and cone distributions across the retina using graphs, the fovea and the blind spot.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • describe rods as more numerous overall and distributed unevenly either side of the fovea
  • identify the fovea from its cone peak and absence of rods at its centre
  • state that neither rods nor cones occur at the blind spot where the optic nerve exits

14.2.7—Distribution of rods and cones question 1

[Maximum number: 3]

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.

Fig. 3.2 is a photograph showing regions of a human retina, as viewed through the pupil at the front of the eye.

Fig. 3.2

Fig. 3.2

Complete Table 3.1 to show the distribution of rods and cones across the retina.
Use these words to complete the table, each word may be used once, more than once or not at all:

Table for Question 14.2.7—Distribution of rods and cones question 1 — CAIE IGCSE Biology
Table 3.1

Table 3.1

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