Question

Which one of the following is the correct difference between rod cells and cone cells of our retina ?

• A. Overall function Vision in poor light Colour vision and detailed vision in bright light
• B. Distribution More concentrated in centre of retina Evenly distributed all over retina
• C. Visual activity high low
• D. Visual pigment contained lodopsin Rhodopsin

Answer 1

Answer: (A)

Rod cell is a type of light-sensitive receptor cell present in the retina of vertebrates. Rods contain the pigment rhodopsin and are essential for vision in dim light. They are not evenly distributed on the retina, being absent in the fovea and occupying all of the retinal margin. Cone cell is a type of light-sensitive receptor cell, found in the retina of all diurnal vertebrates. Cones are specialized to transmit information about colour and are responsible for the visual acuity of the eye. They function best in bright light. They contain pigment iodopsin. They are not evenly distributed on the retina.