Q. Which visual pigment cannot detect colour?

A
Photopsin
B
Iodopsin
C
Rhodopsin
D
None of these
Solution:

Rod cells contain the visual pigment called rhodopsin. This pigment is formed from a protein named opsin and retinal which is a derivative of Vitamin A. Since they are activated even in dim light, we are able to see objects in dim light. These cells cannot detect colour.

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