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प्रश्न
Name the following:
The focal length of the lens is altered by the contraction of which type of muscles.
उत्तर
Ciliary muscles
APPEARS IN
संबंधित प्रश्न
Distinguish between: aqueous humor and vitreous humor
What is the function of the lens in the human eye?
Give the scientific names of the following parts of the eye:
carries signals from an eye to the brain.
There are two types of light-sensitive cells in the human eye:
What is each type called?
Which of the following changes occur when you walk out of bright sunshine into a poorly lit room?
(a) the pupil becomes larger
(b) the lens becomes thicker
(c) the ciliary muscle relaxes
(d) the pupil becomes smaller
Name two animals having eyes:
one the sides of the head.
Name two animals having eyes:
at the front of the head.
Correct and rewrite the statements by changing the biological term that is underlined for the statement:
The part of the eye which can be donated from a clinically dead person is the Retina.
Write whether the following is true or false:
Rods are the receptor cells in the retina of the eye sensitive to dimlight.
Explain the Term: Accommodation in the eye
State the Function:
Aqueous humour
Write an Explanation.
Farthest distance of distinct vision
Why the human eye is compared with camera?
______ is a transparent layer.
The transparent membrane that keeps the eye moist is ______.
The change in the focal length of an eye lens in human beings is caused by the action of ______.
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 |
Given below is a cross section of the human eye. Match the structures marked (a) to (e) with their correct functions:
Example: (f) - 6. Holds the lens in position
| Cross section of Human Eye | Functions | |
 |
1. | Protects retina |
| 2. | Regulates the size of the pupil | |
| 3. | Alters the shape of the lens | |
| 4. | Keeps the lens moist | |
| 5. | Transmits nerve impulses to brain | |
| 6. | Holds the lens in position |
Name the following:
Two pigments of the sensory cells.
Give reason:
Blind spot is considered as 'area of no vision'.
