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Vitamins

Good vision d...

Question

Good vision depends on adequate intake of carotene-rich foods.
Select the best option from the following statements.

A

1 and 2

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B

1, 3 and 4

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C

1 and 3

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D

2, 3 and 4

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Solution

The correct option is B 1, 3 and 4
The photoreceptor cells of the retina contains the photopigments, opsin and retinal. Retinal is an aldehyde derivative of vitamin A and vitamin A derivatives are formed from carotene. So, adequate intake of carotene-rich foods help to maintain good vision.

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Q. 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.

Q. 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

Q. Assertion: Golden rice is a genetically modified corp that helps in recovering from vitamin A deficiency.
Reason: It contains a high level of 𝛃-carotene, which helps in absorbing vitamin A from other food sources.

Q. A list of steps involves the mechanism of vision is given below in random order.

(i) Neural impulses are analyzed and the image formed on the retina is recognized by visual cortex.

(ii) Membrane permeability changes.

(iii) Ganglion cells are excited.

(iv) Bipolar cells are depolarized.

(v) Action potentials (impulse) are transmitted by optic nerves to the visual cortex.

(vi) Potential differences are generated in the photoreceptor cells.

(vii) Light energy causes a change in the shape of rhodopsin, leading to the dissociation of retinal (an aldehyde of vitamin A) from opsin (a protein).

(viii) Structure of opsin is changed.

Which of the following options represents these events in the correct order?

Q. Vitamin A is produced from carotene in

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