CBSE BoardEnglish MediumSTD 11 HumanitiesPsychologySensory, Attentional And Perceptual Processes2 Marks
Question
Differentiate between two types of photosensitive cells i.e. rods and cones.
✓
Answer
The retina contains two types of light sensitive receptor cells:
About 5 million cones and about 120 millions rods.
Cones, located primarily in the center of the retina in an area called the fovea, function best in bright light and play a key role both in colour vision and in our ability to notice fine detail.
Rods are found throughout retina except fovea and function best under lower levels of illumination, so rods help us to see in a darkened room or at night.
At increasing distances from the fovea, the density of cones decreases and the density of rods increases.
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