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Epithelial Tissue

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Question

________ is a part of the eye that controls the size of the pupil.

A

Iris

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B

Cornea

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C

Sclera

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D

Retina

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Solution

The correct option is A Iris
The size of the pupil is regulated by the activity of the radial and circular muscles present in the iris of the eye. When the circular muscles contract, the size of the pupil decreases and contraction of radial muscles increases the size of the pupil.

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A dark muscular diaphragm that controls the size of the pupil is ______.

Q. The hole in the eye that controls the amount of light that enters is the
(a) iris.
(b) pupil.
(c) cornea.
(d) sclera.

Q. Fill in the following blanks with suitable words:
(a) Most of the refraction of light rays entering the eye occurs at the outer surface of the.............
(b) The part of eye sensitive to light is...................
(c) The part of eye which alters the size of the pupil is............
(d) When light is dim, the pupil becomes................
(e) The iris controls the amount of................entering the eye.
(f) The ciliary muscles control the shape of the ...............
(g) To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made..........
(h) To bring light from a near object to a focus on the retina of the eye, the convex eye-lens need to be made.......

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