Question

Differentiate between rod and cone cells.

Answer 1

Answer:

Hey mate here is your answer......

• Rods are one of the photoreceptors found in the eye, these have rod-like structure and provides twilight vision. Cones are also photoreceptors present in the eye, they are fewer in number and are of the cone shape.

• Rods are usually located around the boundary of the retina.Cones are usually located in the center of the retina.

• Rods are about 120 million photoreceptors out of the total 125 million photoreceptors in the human eye.Cones are 5 million photoreceptors

Hope it helps you.....

Answer 2

Answer:

Sl. No. Rod Cells Cone Cells

1 Rod cells are located at the peripheral portion of the retina. Cone cells are located at the central part (fovea) of the retina

2 Rod cells are cylindrical and comparatively longer than cone cells Cone cells are comparatively shorter than rod cells

3 Rod cells are narrower than cone cells Cone cells are usually wider than rod cells

4 More number of rod cells than cone cells Number of cone cells are lesser than that or rod cells

5 Average number of rods in human is 120 million Average number of cones in human is 6 million

6 Rod cells are extremely sensitive to low levels of light Cone cells are very slow sensitive to low light. Cone cells are very sensitive to bright light

7 Rod cells can be triggered even by a single photon of light Large number of protons is required to trigger the cone cells

8 Rod cells help in scotopic vision (low light vision) and night vision Cone cells help in photopic vision (high light vision) daylight vision

9 Only one type of visual pigment is present in rod cells Three different types of visual pigments present in cone cells

10 Rod cells possess very rapid regenerative power The regenerative power of cone cells is very less

11 In human, only a single type of rod cell is present In human, three distinct types of cone cells are present based on their pattern of response to different wavelength of light

12 The outer segment of rod cell is cylindrical and contains the pigment rhodopsin The outer segment of cone cell is cone shaped and contains the pigment photopsin

13 Only one type of rhodopsin is present in rod cells Three different types of photopsin, which respond differently with different wavelength of light (blue, green and red), are present in cone cells to enable the colour vision

14 Rod cells are sensitive to scattered and direct light Cone cells are sensitive only to direct light

15 The visual acuity of rod cells is less The visual acuity of cone cells is high

16 Rod cells are absent in fovea Cone cells are concentrated in the fovea

17 Loss of rod cells causes night blindness Loss of cone cells causes legal blindness

Hope it helps u please

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