A) depletion of vision pigment in rods
B) depletion of vision pigment in cones
C) repletion of vision pigment in rods
D) repletion of vision pigments in cones
Correct Answer: C
Solution :
Two types of photoreceptor cells are present in retina, ie, rods and cones. (i) Rods These cells are active in dark. Rhodopsin a vision pigment is present in rods. In strong light, rhodopsin is bleached due to splitting of its two components, ie, scotopsin and retinal. But is reformed in dim light, ie, dark. (ii) Cones These cells are active in strong light. Iodopsin, a pigment is present in cones. These cells produce sharp coloured image in bright light.
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