Question

Differentiate between the following pair on the basis of what is mentioned within brackets:

Rod cells and cone cells (pigment)

Answer 1

Rod cells:

1. Rod cells are one kind of photoreceptor cell of the retina
2. They are present throughout the retina except at the blind spot and fovea centralis(yellow spot)

Cone cells:

1. Cone cells are one kind of photoreceptor cell of the retina.
2. They are mainly present in the yellow spot (at other places they are fewer in number).

Rod cells	Cone cells
They are Rod-shaped cells Rod cells contain rhodopsin pigment. Rod cells help us to see in dim light. The human eyes contain 115-120 million rod cells. Rod cells generally form black and white vision. Inactivity of rod cells can cause night blindness.	They are cone-shaped cells. Cone cells contain iodopsin pigment. Cone - cells help us to see in bright light. The human eyes contain 6.0- 6.5 million cone cells Cone cells are responsible for color vision. Inactivity of cone cells can cause color blindness.