Question

Find out the right matching from the following pairs.
A. Accommodation - pupils
B. Colour perception - Cones
C. Night Blindness - Rods
D. Binocular vision - Iris

Answer 1

Hint: The adult human eye ball is a spherical three layered structure. The external ear has a dense connective tissue called Sclera. Cornea is the anterior portion of this layer. The middle layer is called the choroid layer which becomes thick in the anterior portion to form a ciliary body. The ciliary body continues further to form the visible coloured and opaque part of the eye called Iris. Lens is present in the eyeball which is held in its place by ligaments and in front of lens, an aperture which is surrounded by iris called pupil is present. Retina is the innermost layer of the retina which inturn has three layers:- ganglion cells, bipolar cells and photoreceptor cells (Cones and Rods).

Complete Step by Step Answer:
Accommodation is the ability of the eye to change its focus from distant to near objects and from near objects to distant depending on the situation. The process of accommodation is exhibited by lens and ciliary muscles.
Thus, option A is incorrect.

Cones and Rods are the photoreceptor cells of the retina. They respond to lights of different wavelengths and colours. The daylight vision and colour perception of light are the functions of cones. Red R, Green G and Blue B are the different types of cone cells present which respond to different wavelengths.
Thus, option B is correct.

Rods contain a purplish-red protein called the rhodopsin which is the derivative of vitamin A which is very helpful in preventing night blindness. Carrot is recommended to consume to prevent night blindness as it is rich in vitamin A.
Thus, option C is incorrect.

Each eye sees a similar but slightly different image, this is referred to as binocular vision. This is due to the position of the eyes which are located on the front of the head and not on the sides. Thus overlapping allows each eye to view objects with slightly different points of view.
The diameter and size of pupils is regulated by iris and it controls the amount of light reaching the retina.
Thus, option D is incorrect.

Hence, option B is the correct answer.


Note: Any damage of cone cells may result in decreased clarity of vision while looking straight ahead, less ability to see colours and photophobia (abnormally sensitive to light).