Answer: Option D
:
D
There are two types of photoreceptor cells namely Rods and Cones.
1. Cones are concentrated in the center of the retina, contains photopigment called iodopsin. Cones responsible for daylight (photopic) vision and color vision
2. Rods are evenly distributed all over the retina, contains a photopigment called rhodopsin or visual purple, which contain a derivative of Vitamin-A. Rods responsible for twilight (scotopic) vision
And visual acuity not specifically linked to the photoreceptor cells but many different aspects of vision.
So, 4th is the correct differentiation between rod and cone.