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प्रश्न
What are the functions of tears?
उत्तर
The functions of tears:
(i) To lubricate the surface of the eye.
(ii) To wash away dust particles.
(iii) To help in killing germs.
(iv) To communicate emotions.
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संबंधित प्रश्न
Answer briefly:
How do you perceive the colour of an object?
Explain the mechanism of vision.
Fill in the following blank with suitable word:
The iris controls the amount of................entering the eye.
The eyes of a person are focused (i) on a nearby object, and (ii) on a distant object, turn by turn. In which case:
the focal length of eye-lens will be the maximum?
What shape are your eye-lenses:
when you look at your hand?
fill in the following blank with suitable word:
A person is short-sighted if his eyeball is too............Spectacles with a .............lens are needed. A person is long-sighted if his eyeball is too............Spectacles with a ................lens are needed. These focus light rays exactly on to the..........
A person got his eyes tested. The optician's prescription for the spectacles reads:
Left eye: − 3.00 D
Right eye: − 3.50 D
The person is having a defect of vision called:
(a) presbyopia
(b) myopia
(c) astigmatism
(d) hypermetropia
Out of animals of prey and predators, which have their eyes:
at the front of their head?
Name two animals having eyes:
at the front of the head.
Having two eyes gives a person:
(a) deeper field of view
(b) coloured field of view
(c) rear field of view
(d) wider field of view
Name the following:
Short sightedness.
Give the main function of the following:
Lachrymal glands
Choose the correct answer :
The rods and cones of a vertebrate retina function is to _________
______ is tough and thick white sheath that protects the inner parts of the eye.
At noon the sun appears white as
What is ‘white of the eye’?
Write the main functional activity of the following structure.
Choroid
