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प्रश्न
Give the main function of the following:
Three semicircular canals
उत्तर
Three semicircular canals - It maintains the dynamic equilibrium.
APPEARS IN
संबंधित प्रश्न
Distinguish between: aqueous humor and vitreous humor
Draw a neat and labelled diagram of the structure of the human eye.
A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads :
Left eye : +2.50 D
Right eye : +2.00 D
State whether these lenses are thicker in the middle or at the edges.
Name the part of the eye:
which changes the focal length of eye-lens.
Give the scientific names of the following parts of the eye:
muscles which change the shape of the eye-lens.
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?
Explain the functions of the following parts of the eye:
(i) cornea
(ii) iris
(iii) pupil
(iv) ciliary muscles
(v) eye-lens
To focus the image of a nearby object on the retina of an eye:
(a) the distance between eye-lens and retina is increased
(b) the distance between eye-lens and retina is decreased
(c) the thickness of eye-lens is decreased
(d) the thickness of eye-lens is increased
How much is our field of view:
with both eyes open?
Give Technical Term:
The fluid which conveys the vibrations of sound in the cochlea and semicircular canals.
Give Technical Term:
The nutritive layer of the eye which also presents reflection of light.
Choose the Odd One Out:
Complete the following sentence with appropriate Word
The photoreceptor cells of the retina sensitive to colour are:
Draw a scientifically correct labelled diagram of a human eye and answer the questions based on it:
- Name the type of lens in the human eye.
- Name the screen at which the maximum amount of incident light is refracted?
- State the nature of the image formed of the object on the screen inside the eye.
Name the capacity of the eye lens to change its focal length as per need.
Which cells of the retina enable us to see coloured objects around us?
Match the following:
| Column - I | Column - II |
| 1. Retina | a) Path way of light |
| 2. Pupil | b) Far point comes closer |
| 3. Ciliary muscles | c) near point moves away |
| 4. Myopia | d) Screen of the eye |
| 5. Hypermetropia | e) Power of accommodation |
Match the following:
| Column - I | Column - II | ||
| 1 | Retina | a | Path way of light |
| 2 | Pupil | b | Far point comes closer |
| 3 | Ciliary muscles | c | near point moves away |
| 4 | Myopia | d | Screen of the eye |
| 5 | Hypermetropoia | e | Power of accomodation |
Assertion (A): Rods and Cones are photoreceptors in the sclera of eyeball.
Reason (R): Rods are sensitive to dim light.
