Question

Low light intensity, during night is detected by

• A. Lens
• B. Rods
• C. Cones
• D. Both B and C

Answer 1

Answer: (B)

Rods

A. Lens is the crystalline structure in eye ball which is biconvex in nature and focus the light rays on the retina.

B. Rods are the photoreceptor cells that contain rhodopsin pigment and associated with scotopic vision of eye i.e. vision under low light.

C. Cones are the photoreceptor cells that contain iodopsin, porpyrosin and cyanopsin pigments. These cells are associated with the daylight vision and colour vision of eyes.

Hence, low light intensity as during night is detected by rods.

So, the correct answer is 'Rods'.