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Good vision depends on adequate intake o...

Good vision depends on adequate intake of cacotene 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 ineer segment
( C) Retinal is a derivative of Vitamin A
(D) Retinal is a light absorbing part of all the visual photopigments

A

(1) and (2)

B

(1), (3) and (4)

C

(1) and (3)

D

(2), (3) and (4)

Text Solution

Verified by Experts

The correct Answer is:
B
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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 derivateves are formed from carotene (b) Photopigments are embedded in the membrane discs of inner segment(c ) Retinal is derivative of v itamin A (d) Retinal is a light absorbing part of all the visual pigments.

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A list of steps involved in mechanism of vision is given below in a random order. (i)Neural impulses are analysed and image formed on retina is recognised by visual cortex. (ii)Membrane permeability changes (iii)Ganglion cells are excited (iv)Bipolar cells are depolarised (v)Action potentials (impulse) are transmitted by optic nerves to visual cortex. (vi)Potential differences are generated in the photoreceptor cells. (vii)Light energy causes a change in shape of rhodopsin, leading to the dissociation of retina (an aldehyde of vitamin A ) from opsin (a protein) (viii)Structure of opsin is changed. Which of the following options represents these events in a correct order ?

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MODERN PUBLICATION-NEURAL CONTROL AND COORDINATION-COMPETITION FILE (OBJECTIVE TYPE QUESTIONS)(A. MULTIPLE CHOICE QUESTIONS)
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  10. the anterior portion of sclera is called

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  11. The projecting ridge in am pulla of semicircular canals in ear is call...

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  12. The pneumotaxic and repiratory rhythm centres respectively present in

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  15. Photosensitive compound in human eye is made up of:

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  16. Good vision depends on adequate intake of cacotene rich food Select ...

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  19. The transparent lens in the human eye is held in its place by

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