Question

Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics.

A. Retina - contains photoreceptors- rods and cones.
B. Blindspot - has only a few rods and cones.
C. Aqueous chamber reflects the light which does not pass through the lens.
D. Choroid - its anterior part forms a ciliary body.

Answer 1

The eye is the most significant instrument that detects light and sends signals on the optic nerve (second cranial nerve) to the brain. The retina is sensory in nature whereas the blindspot helps for interpretation. The rod and cones help in vision in light and dark. The aqueous chamber helps in maintaining intraocular pressure and the choroid prevents internal reflection in the eye. The human eye has many parts including the iris, Cornea, Pupil, Sclera, and Conjunctiva.

Complete step by step answer: The human eye is known to be the most complex organ in the human body. It is responsible for functions like providing the vision, helping in color differentiation, etc of the human body.

-The Retina (tissue layer) is the sensory layer of the eye that consists of rod and cone cells for vision. The rod cells in the retina facilitate the vision in dim light-weight whereas the cone cells facilitate the vision in sturdy light.
-Blindspot is that particular point of the eye that is void of rod and cone cells. The optic nerve emerges from that point that carries the optic impulse to the lobe of the brain for interpretation.
The aqueous chamber is filled with a clear fluid called humor. It is responsible for maintaining the pressure(intraocular)and index of refraction of the eye.
-The choroid is the vascular layer that absorbs the light and prevents the inner reflection of light within the eye. The anterior part of the choroid coat layer forms the ciliary body which is a membrane.
Hence, the proper choice A- Retina - contains photoreceptors- rods and cones.

Note: Human eye has a special receptor responsible for receiving visual pictures that are then carried to the brain. Light enters the eye through the tissue layer, the clear front surface of the eye, that acts sort of a lens. The iris works very like the controller of a camera onto how much light reaches the back of the eye.