Question

The portion of the eye which is differently coloured in different people and gives characteristically coloured eye is the
A. Retina
B. Cornea
C. Sclera
D. Iris

Answer 1

Hint: All human beings contain two eyes located at the front side of the face. The eyes have a different eye colour in different humans. This colour of the eye is controlled by the expression of a different set of genes in different individuals, which are present in their chromosomes.

Complete answer:
The human eye contains different parts. The outermost white covering of the eye is called the sclera. It is transparent on the front side. This part is called the cornea, from where light enters into the eye. It is followed by a membrane-like structure that is called iris. It acts like a shutter similar to a camera as it can increase or decrease the size of the pupil and thus, it can control the amount of light entering into the eye during the dark (inside) and bright conditions (outside). The next part of the eye is the eye lens. It is made up of protein. It can change its shape according to the distance of the object to make a fine image on the retina, the screen of the eye.

The Iris is a part that has colour or pigmentation, which gives a different colour to the eye in different individuals. These shades include amber, blue, brown, grey, green, hazel and red.

Hence, the correct answer is option (D), Because iris is the part of the eye that contains colour for pigmentation.

Note: The retina of the eye acts as a screen, similar to the screen of a projector device or in the cinema hall, where the image of the object is formed with the help of the eye lens. The pigmentation of the iris is now used for the identification of individuals. It is called an eye scan, which is unique for each individual. No two individuals can have the same colouring pattern of iris.