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How do rods and cones of human eye diffe...

How do rods and cones of human eye differ from each other chemically and functionally?

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a) Rods contain a purplish red protein called rhodopsin or visual - purple which contains a derivative of vitamin A and they are important-in twilight.
b) Cones contain a visual pigment iodopsin made of a protein called photopsin and they are important in day light and colour vision.
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