Question

Which part of the eye is a dark muscular diaphragm?
A. Iris
B. Cornea
C. Pupil
D. Retina

Answer 1

Hint: Eyes are the organ responsible for the visual system in the human body. The spherical shaped organ is situated in the eye socket of the skull. The light which is detected by the eyes is converted into electro-chemical impulses in the neuron of the brain.

Complete answer: The eyes are the sight organ present in the human body due to which we can see things. The eyes react to the light and produce vision. The cells rods and cones present in the retina are responsible for the perception of light and vision. The human eye is composed of three layers. The outer layer consists of the cornea and sclera. The front clear portion of the eye that transmits and focuses light is called the cornea. The remaining portion behind is called sclera. Choroid, ciliary body, and iris are the three components that make up the middle layer of the eye. The dark muscular diaphragm which is present behind the cornea is called iris. In the center of the iris, a small aperture called pupil is present. The amount of light entering into the eye is controlled by the pupil present in the center of the iris. The third layer which is the innermost layer is called the retina. The retina is a nerve layer that regulates the function of sensing the light and creating the electrical impulses that travel to the brain via the optic nerve.

So, option A is the correct option.

Note: Eyes are included in the sensory nervous system of the human body. The human eye can detect millions of different colors and also can sense even a single photon. The iris of the eye is responsible for the color of the eye. An ocular condition in which the color of the iris in one eye is different from the color of the iris of another eye of an individual is called heterochromia.