Question

which of the following structures are the sensory receptor cells active in dim light?
a cones
b lens
c rods
d optic disk

Explanation:

• Cones: Function mainly in bright light and are responsible for color vision.
• Lens: Focuses light onto the retina; not a sensory receptor cell.
• Rods: Highly sensitive to dim light, enable black - and - white vision in low - light conditions.
• Optic disk: The point where the optic nerve exits the eye; has no photoreceptor cells.

Answer:

C. rods