Question

Which of the following statements about the human eye is not true?
A. The iris gives a distinct colour to the eye
B. The yellow spot is extremely sensitive to light
C. The space between lens and cornea is filled with ciliary muscles
D. The optic nerve enters the eye near the blind spot

Answer 1

Hint: Study deeply about the human eye and mainly about iris, yellow spot, cornea, optic nerve and lens to find out which of the given statements is not true.

Complete step by step answer:
As we know, a human eye has many parts. They are iris, Cornea, Pupil, Sclera and Conjunctiva.
Iris is a thin, annular structure in the eye responsible for controlling the enlargement of the pupil and the amount of light that is reaching the retina. Eye color is actually defined by iris. A pigment within the iris called melanin gives eyes their distinct color.
Yes, the first statement is correct.
The yellow spot is an oval spot near the centre of the retina of the human eye. It is 1.5 millimeters. It is specialized for seeing things with clarity and most of the sensory cells are present here.
Yes, the second statement is also correct.
Ciliary muscles surround the lens. The muscles hold the lens still and also they play a very important role in the vision of the eye. The space between lens and cornea is filled not with ciliary muscles but with a liquid known as aqueous humour.
No, the third statement is not correct.
The optic nerve is in the backside of the eye. It is also called the second cranial nerve and used to transfer visual info from the eye. The blind spot is the area on the retina without receptors that respond to light. The optic nerve exits the eye on its way to the brain through blind spot. The optic area enters the eye near the optic disk. At the blind spot, an image will not be formed and cannot be seen.
No, the fourth statement is also not correct.

Note:Human eye is a very special sense organ responsible for receiving visual images, which are then carried to the brain. Light enters the eye through the cornea, the clear front surface of the eye, which acts like a camera lens. The iris works much like the controller of a camera controlling how much light reaches the back of the eye.