Multiple choice

The iris ____.

  1. controls the amount of light entering the eye

  2. acts as a photographic film on which images are obtained

  3. helps in the discrimination of colours by the eye

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The iris is the colored part of the eye that contains muscles to control the size of the pupil. By adjusting pupil diameter, it regulates the amount of light entering the eye - dilating in low light conditions and constricting in bright conditions. The retina (option B) is the 'screen', and color discrimination is handled by cone cells in the retina (option C).

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