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प्रश्न
Write the main functional activity of the following structure.
Choroid
उत्तर
- The choroid layer is richly supplied with blood vessels to nourish the eye.
- It contains a dark black pigment (melanin), which prevents light rays from reflecting and scattering inside the eye.
संबंधित प्रश्न
Answer briefly:
How do you perceive the colour of an object?
A person walking in a dark corridor enters into a brightly lit room:
State the effect on the pupil of the eye.
How does the eye change in order to focus on near or distant objects?
(a) The lens moves in or out
(b) The retina moves in or out
(c) The lens becomes thicker or thinner
(d) The pupil gets larger or smaller
Fill in the following blank with suitable word:
Having two eyes enables us to judge.................more accurately.
The animals called predators have:
(a) both the eyes on the sides
(b) one eye on the side and one at the front
(c) one eye on the front and one at the back
(d) both the eyes at the front
Mention the characteristics of the image that falls on the retina of the eye.
The figure below compares a part of our eye with a part of a photographic camera.
Name the corresponding parts of the eye the camera shown here that are comparable in function.
Give scientific reason:
We cannot clearly see an object kept at a distance less than 25 cm from the eye.
Name the following:
White part of the eye.
Sketch and label V.S. of a human eye.
Name the following:
The region in the eye where the rods and cones are located.
Mention, if the following statement is True or False
The least distance of distinct vision for the human eye is 25 cm
State the Function:
Cornea
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.
At noon the sun appears white as
A tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in the figure as A, B, C and D. In which position mirror will be visible?
 |
 |
 |
 |
| (A) | (B) | (C) | (D) |
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 | Pathway 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 | f | Power of accommodation |
Explain the role of the part of human eye responsible for power of accommodation of human eye.
The thin, transparent extension of sclerotic layer found in front of the lens is ______.
