Question

The part of the human eye where rod cells and cone cells are located
A. Retina
B. Cornea
C. Choroid
D. Sclera

Answer 1

Hint: Human eye is the only sense organ that is sensitive to light. Cells, specialized for perceiving light and converting it into electrical signals are present in the eye. These cells are called photoreceptor cells. they are present in the innermost part of the eye.

Complete step by step answer: Humans have a pair of eyes located in cavities of the skull called orbits. The part of the eye that is visible to us comprises the cornea, sclera, iris, and pupil. The sclera is covered by the conjunctiva, which is a very thin layer. The white visible part of the eye is called cornea – it is transparent and curved. The pupil is an aperture like structure located at the center of the iris. The posterior part of the eye comprises the lens, retina, aqueous and vitreous humor and the optical nerve.
The retina is the innermost part of the eye. It comprises photoreceptor cells that are sensitive to light. The retina is analogous to the image sensor of a camera. The optical system of the eye focuses the light on the retina to create a two-dimensional image which is translated into electrical impulses and analyzed by the visual cortex of the brain that results in vision. The photoreceptor cells of the retina are called rod cells and cone cells. The rod cells are sensitive to low light, while the cone cells are activated in bright light.
Cornea is a transparent covering of the pupil and the iris. The cornea is responsible for refracting the light rays and focuses the same on the retina. It does not contain either cone cells or rod cells.
Choroid is a vascular layer of the eye. It is present between the cornea and sclera. The choroid is responsible for providing nutrition to the retina.
Sclera is the fibrous protective layer that is primarily composed of collagen and elastic fibers. It does not contain the photoreceptor cells.
Therefore, it can be concluded that the rod cells and cone cells are present in the retina.
Hence, option (a) is correct.

Note: Eye is the sense organ that is responsible for vision in animals. All the physiological components of the body responsible for vision are known as the visual system. This system is responsible for colour vision, motion perception, pattern recognition, sense of light. Vision and image formation are attributed to the photosensitive cells of the eye – the rod cells and the cone cells. they are present in the innermost part of the eye or the retina.