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Cambridge IGCSE Biology practice

Paper 3 structured question: Sense organs

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Sense organs

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Paper 3Theory (Core)2 marks

Understanding the structure and function of the eye is essential for explaining how vision works.

Diagram Description

Parts of the Human Eye

A diagram shows the cornea, iris, pupil, lens, retina, and optic nerve labeled.

  1. a

    Describe the role of the cornea in vision.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe the function of the optic nerve.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Sense organs

Paper 3Theory (Core)3 marks

Description

Eye Parts and Their Roles

The cornea bends light, the iris controls light entry, the lens focuses light onto the retina, the retina contains light-sensitive receptors including color detectors, and the optic nerve sends signals to the brain.

  1. a

    Identify the part of the eye that controls the amount of light entering through the pupil.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe the role of the retina.

    Aim for approximately 2 distinct marking points.

    [2]