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The pupil of the eye becomes smaller in bright light. What is the main benefit of this response?

Answer and explanation

Correct answer: It reduces the amount of light entering the eye

The governing concept is the pupil reflex, which regulates the amount of light reaching the retina. In bright conditions, circular muscles of the iris contract and make the pupil smaller. This limits incoming light and helps protect the retina while preventing excessive glare. Therefore option A is correct. Digestion, blood pumping, and sound detection are not functions of the pupil or iris.

Related tags

PupilIrisRetinaEye ReflexStructure Of EyeThe Human Eye And The Colourful WorldScienceClass 10 Mcq

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