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प्रश्न
The figures (A) and (B) given below are showing some kind of adjustment. Study the figures and answer the questions that follow.
| A |  |
 |
B |
- Identify the kinds of adjustments done in the figures (A) and (B).
- Distinguish between the adjustments of figures (A) and (B) on the basis of:
- The size of pupil.
- The pigment which gets regenerated.
- Cells of the retina.
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उत्तर
- The kind of adjustments done in Figure (A) is dilated pupil due to dim light.
The kind of adjustments done in Figure (B) is constricted pupil due to bright light. -
- In the case of A, the pupil dilates to allow more light into the eyes.
In case B, the pupil constricts, reducing the amount of light entering the eyes. - Case A involves the regeneration of visual purple or rhodopsin.
Case B involves the regeneration of cone cells or iodopsin. - Rod cells become activated and begin producing rhodopsin.
Cone cells become activated and begin producing iodopsin.
- In the case of A, the pupil dilates to allow more light into the eyes.
संबंधित प्रश्न
The change in focal length of an eye lens is caused by the action of the ______.
Write an Explanation.
Persistence of vision
The 'eye muscles' are controlled by which cranial nerves?
The ability of the eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called:
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 textbook. Which of the following statements is correct?
When light rays enter the eye, most of the refraction occurs at the
How are we able to see nearby and also the distant objects clearly?
The vitamin required for the synthesis of rhodopsin is ______.
Name the following:
Two types of adaptations.
Differentiate between members of the following pair with reference to what is asked in the bracket.
Dark and light adaptation (pigments which will be regenerated).
