A) Features Visual acuity Rod Cells High Cone Cells Low
B) Features Visual pigment Rod Cells Iodopsin Cone Cells Rhodopsin contained
C) Features Overall function Rod Cells Vision poor light Cone Cells Colour vision and detailed vision in bright light
D) Features Distribution Rod Cells More concentrated in Cone Cells Evenly distributed all over centre of retian retina
Correct Answer: C
Solution :
The retina is the neural and sensory layer of eyeball. A small, oval, yellowish area of the retina lying exactly opposite the centre of cornea-is named the macula lutea or yellow spot, -which has at its middle a shallow depression the fovea centralis. The fovea centralis has cone cells only. It is devoid of rods and blood vessels. The rods contain the rhodopsin (visual purple) pigment and enable the animals to see in darkness. Therefore present in large number in nocturnal animals. The cones contain the iodopsin (visual violet) pigment and chiefly concerned with distinction in colour and light vision during day time.
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