The function of iris in the eyes of frog is to

Refract the light rays

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Alter the size of the pupil

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Move the nictitating membrane

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Move the lens forward and backward

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Solution

The correct option is D Alter the size of the pupil
Smooth muscle cells of the frog iris sphincter contain rhodopsin and contract in response to light. It is the colored part of the eye, which regulates the size of the pupil controlling the entry of light into the eye.

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