A)
Features Rod Cells Cone Cells Visual acuity High Low
B)
Visual pigment contained Iodopsin Rhodopsin
C)
Overall function Vision poor light Colour vision and detailed vision in bright light
D)
Distribution More concentrated in centre of retian Evenly distributed all over retina
Correct Answer: C
Solution :
| [C] 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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