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प्रश्न
Compare the following: Choroid and retina
उत्तर
| Choroid | Retina | ||
| 1 | Choroid is the middle vascular layer of eye. | Retina is the innermost nervous coat of eye. | |
| 2 | It contains numerous blood vessels that provide nutrients and oxygen to retina and other tissues. | It contains photoreceptor cells, rods and cones that are associated with twilight and colour vision respectively. |
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संबंधित प्रश्न
Draw labelled diagrams of the following: Eye
Match the following:
| Column I | Column II |
| (i) Myopia | (a) Converging power of eye lens becomes low |
| (ii) Hypermetropia | (b) Converging power of eye lens remains the same |
| (c) Converging power of eye lens becomes high |
Name the part of the eye:
which changes the focal length of eye-lens.
There are two types of light-sensitive cells in the human eye:
Where are they found?
Refraction of light in the eye occurs at:
(a) the lens only
(b) the cornea only
(c) both the cornea and the lens
(d) the pupil
The descriptions of five kinds of images are given below:
(a) diminished and virtual
(b) enlarged and real
(c) enlarged and erect
(d) real and inverted
(e) virtual and the same size
Which one of these describes the image formed:
(i) on the retina of the eye?
(ii) by a magnifying glass?
(iii) by a convex driving mirror on a car?
(iv) by a plane mirror?
(v) on the screen of a slide projector?
After testing the eyes of a child, the optician has prescribed the following lenses for his spectacles:
Left eye : + 2.00 D
Right eye : + 2.25 D
The child is suffering from the defect of vision called:
(a) short-sightedness
(b) long-sightedness
(c) cataract
(d) presbyopia
Mention if the following statement is true (T) or false (F) Give reason.
Blind spot is called so because no image is formed on it.
State the function of each of the following parts of the human eye:
(i) Cornea
(ii) Iris
(iii) Pupil
(iv) Retina
Millions of people of the developing countries are suffering from corneal blindness. This disease can be cured by replacing the defective cornea with the cornea of a donated eye. Your school has organised a campaign in the school and its neighbourhood in order to create awareness about this fact and motivate people to donate their eyes after death. How can you along with your classmates contribute in this noble cause? State the objectives of organising such campaigns in schools.
Give the main function of the following:
Fovea centralis
Answer the following question.
Trace the sequence of events Whichoccur when a bright light is focused on your eyes.
Answer the following question.
Write the structure of eye lens and state the role of ciliary muscles in the human eye.
Give Technical Term:
Name the part of the retina on which an object is focused for the clearest vision.
Choose the Odd One Out:
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.
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his text book. Which of the following statements is correct?
Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?
In human eye the part which allows light to enter into the eye is ______.
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 |
