.......... is present in rod cells and helps the eye to adapt to dim light.

Vitamin K

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Melanin

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Rhodopsin

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Vitamin C

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Solution

The correct option is C Rhodopsin
Rhodopsin is also called as visual purple. It is a chromoprotein (protein linked to a pigment-carrying substance) that is contained in the light-sensitive cells of the rod type in the retina of the eye. It helps the eye to adapt to dim light. When the eye is exposed to bright light, the rhodopsin bleaches; after an interval of darkness, it returns to its former purple-red colour. The pigment-bearing portion of rhodopsin is retin, a substance formed by oxidation of vitamin A. The protein portion is opsin. In a bright light rhodopsin breaks down into retinal and opsin; in the dark the process is reversed.
Therefore, the correct answer is option C.

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Question 7

Which of the following statements is correct regarding rods and cones in the human eye?
(a) Cones are sensitive to dim light
(b) Cones are sensitive to bright light
(c) Rods are sensitive to bright light
(d) Rods can sense colour

Dim light: rod cells :: Bright light: ______

12. Retina of Human Eye is made of two kinds of cells. Which of the following statements are true with respect to the same ?

1. Rods are the cells which are sensitive to the bright light and colour.

2. Cons are the cells which are sensitive to the dim light.

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