Question

Differentiate between the following :

Rods and cones

Answer 1

Rod cells:

1. Rod cells are present in the retina.
2. They are photosensitive rod-shaped cells.
3. They help us to see in dim light.

Cons cells:

1. These cells are present in the retina.
2. They are photosensitive pigmented cone-shaped cells.
3. They help us to see in bright light and perceive colours.

ROD CELLS	CONE CELLS
They are elongated or rod-shaped cells. They contain rhodopsin pigment. The retina of the human eyes contains 115-120 million rod cells. They become more active in dim light. They can not differentiate different colours except black and white. Problems in rod cells cause night blindness.	They are cone-shaped cells. They contain iodopsin pigments. The retina of the human eyes contains 6.0 - 6.5 million cone cells. They become more active in bright. They can differentiate different colours. Problems in cone cells cause colour blindness.