Question

Visual Purple is concerned with
a. Bright Light
b. Dim Light
c. Moderate Light
d. Darkness

Answer 1

Hint: Visual Purple is a biological pigment present in the rods of the retina and is a G-protein-coupled receptor (GPCR). It belongs to opsins and is enormously sensitive.

Complete answer:
Visual purple or Rhodopsin is a protein present in rods which are a kind of photoreceptor cells in the retina. Rods are associated with the scotopic vision of the eye i.e. vision under low light. Rhodopsin is a derivative of vitamin A. On the other hand, the cells which are connected with the vision in daylight are cones which are photoreceptors cells containing porphyrin, iodopsin, and cyan opsin pigments.

Hence, The correct answer is option (B), Because visual purple is linked with dim light.

Additional information:
Visual Purple is found in a broad range of organisms, from vertebrates to bacteria. In many considering animals, including humans, it is necessary for vision in dim light and is positioned in the retina of the eye specifically, within the compactly packed disks that make up the on the external segment of the retina’s photoreceptor rod cells, which are in particular adapted for vision in low-light conditions.

Note: Visual Purple was revealed in 1876 by German physiologist Franz Christian Boll, who discovered that the normally reddish-purple frog retina turned pale in bright light. The waning of color was soon after attributed to the demolition of rhodopsin, through a process known as bleaching.
Bleaching and the consequent regeneration of rhodopsin are key steps in the visual cycle of the series of biochemical reactions that are essential for vision in low light.