Question

The light sensitive cells present in retina are:

• A. rods and cones
• B. cones and cortex
• C. rods and pelvis
• D. cortex and fovea

Answer 1

Answer:

A. rods and cones

• The human retina contains two types of photoreceptor cells: rods and cones.

• Rods: These cells are highly sensitive to light and are responsible for vision in low-light conditions (scotopic vision). They do not perceive color and provide black-and-white vision. There are approximately 120 million rods in each human eye.

• Cones: These cells are less sensitive to light and function best in bright light conditions (photopic vision). They are responsible for color vision and fine detail (visual acuity). There are approximately 6 to 7 million cones in each human eye, concentrated in the fovea centralis.

• The fovea centralis is a small depression in the retina where visual acuity is highest, and it is densely packed with cones.

• Both rods and cones contain photopigments that undergo chemical changes when struck by light, initiating the visual signal.