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Question

Which one of the following is the correct difference between rod cells and cone cells of our retina?
  Rod cellsCone cells
 aVisual acuityHighLow 
 bVisual pigmentIodopsinRhodopsin 
 cOverall functionVision in poor light Colour vision and detailed vision in bright light
 dDistributionMore concentrated in centre of retinaEvenly distributed all over retina


A
a
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B
b
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C
c
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D
d
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Solution

The correct option is B c
The retina contains the cells, that respond to light. These specialized cells are called as photoreceptors. There are 2 types of photoreceptors in the retina: rods and cones. 
The rods are most sensitive to light and dark changes, shape and movement and contain only one type of light-sensitive pigment. 
Cones are most sensitive to one of three different colours (green, red or blue). Signals from the cones are sent to the brain, which then translates these messages into the perception of colour. Cones work only in bright light. 

Biology

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