Question

Aperture of pupil is controlled by

• A. Conjunctiva
• B. Cornea
• C. Iris
• D. Retina

Answer 1

The correct option is C Iris

A. Conjunctiva is a thin transparent membrane lining the eyelids and protects the delicate cornea and front portion of the eye.

B.Cornea is the anterior portion of eye which absorbs oxygen from the air. It is the only part of human body which is devoid of blood supply and absorbs oxygen directly from the air.

C. Iris is a opaque and pigmented structure in eye. It is visible as coloured portion. It regulates the amount of light entering the eye by controlling the size of pupil (an aperture in eye through which light enters).

D. Retina is present in the inner layer of eye. The image is perceived by brain and formed on the retina.

So, the correct answer is 'Iris'.