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Good vision depends on adequate intake of carotene rich food. Select the best option from the following statements: (i) Vitamin A derivatives are formed from carotene (ii) The photopigments are embedded in the membrane discs of the inner segment (iii) Retinal is a derivative of Vitamin A (iv) Retinal is a light absorbing part of all the visual photopigments

1. (i), (iii) and (iv)
2. (i) and (iii)
3. (ii), (iii) and (iv)
4. (i) and (iv)

Correct answer: (i), (iii) and (iv)

Solution

Carotene is converted into vitamin A derivatives, and retinal is a derivative of vitamin A. Retinal is also the chromophore that absorbs light in visual photopigments, while statement (ii) is wrong because photopigments are in the membrane discs of the outer segment, not the inner segment.

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