Which animal have porphyropsin instead of pigment rhodopsin in rods?

Fish

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Birds

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Reptiles

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Mammals

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Solution

The correct option is A Fish
In the rods of fresh water fishes, rhodopsin is replaced by the purple photolabile pigment porphyropsin. This participates in a retinal cycle identical in form with that of rhodopsin, but in which new carotenoids replace retinene and vitamin A.

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