Question

The part of the rabbit's eye which acts like the diaphragm of the camera is
A. Pupil
B. Iris
C. Lens
D. Cornea

Answer 1

Hint: The eye is an organ of sight or vision. It has a number of components which includes the cornea, iris, pupil, lens, retina, macula, optic nerve and vitreous. The part of the rabbit's eye which acts like the diaphragm of the camera is the coloured part of the eye.

Complete answer: An iris is a pigmented and opaque structure of an eye that controls the amount of light entering the eye by changing the size of the pupil. It acts like the diaphragm of a camera, dilating and constricting the pupil to allow more or less light into the eyes of a rabbit. The iris works like a shutter of a camera. It has the ability to enlarge and shrink, depending on how much light intensity is passed in the eyes. The two eyelids protect the front of the eye and excessive light by their closure. The inner layer of the cornea is made up of a transparent tissue that allows the light to pass through it. The pupil is the dark opening in the centre of the coloured iris, that controls how much light enters the eye. The ciliary body is a structure located behind the iris which produces aqueous fluid that fills the front part of the eye and thus, maintains the eye pressure. It also allows the focusing of the lens.
Hence, the correct answer is option B.

Note: The pupil is an aperture of the eye or an opening in the iris through which light enters the eye. The cornea is the anterior portion of the sclera which absorbs oxygen from the air. Lastly, the lens is a transparent and crystalline structure present in the eye that focuses light rays to form an image on the retina.