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Neural Control and Coordination
Sense organs – photoreceptors and visual pigments
1 question from 1 paper, each with its answer.
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Concepts tested
- retinal-vitamin-a-vision
All Questions
2017 1 question
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Good vision depends on adequate intake of carotene rich food. Select the best option from the following statements (a) Vitamin A derivatives are formed from carotene (b) The photopigments are embedded in the membrane discs of the inner segment (c) Retinal is a derivative of vitamin A (d) Retinal is a light absorbing part of all the visual photopigments
Statements (a), (c) and (d) are correct; pigments lie in the outer segment.
Carotene is the source of retinal, which is involved in the formation of rhodopsin in rod cells. Retinal, a derivative of vitamin A, is the light-absorbing part of all visual photopigments. Photopigments are in the membrane discs of the outer segment, so (b) is incorrect.