GED Science Practice 2025 – 400 Free Practice Questions to Pass the Exam

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Question: 1 / 400

Which part of the eye is responsible for controlling the size of the pupil?

Cornea

Retina

Iris

The iris is a circular, colored structure located behind the cornea and in front of the lens. It works like a shutter on a camera, adjusting the amount of light entering the eye by controlling the size of the pupil. The cornea primarily focuses light, the retina detects light, and the sclera is the protective outer layer of the eye, therefore none of these options are responsible for controlling the size of the pupil.

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Sclera

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