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Which one of the following statements is not correct?

1. Retinal is the light absorbing portion of visual photo pigments.
2. In retina the rods have the photopigment rhodopsin while cones have three different photopigments.
3. Retinal is a derivative of Vitamin C.
4. Rhodopsin is the purplish red protein present in rods only.

Correct answer: Retinal is a derivative of Vitamin C.

Solution

The incorrect statement is the one claiming retinal is derived from vitamin C. Retinal is a derivative of vitamin A, which is essential for visual pigments. The other statements correctly describe retinal, rhodopsin, and cone pigments.

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