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प्रश्न
Choose the correct answer.
In the chemistry of vision, the photosensitive substance is _________________
पर्याय
melanin
sclerotin
rhodopsin
none
उत्तर
In the chemistry of vision, the photosensitive substance is rhodopsin
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संबंधित प्रश्न
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 retina which is insensitive to light.
Give the scientific names of the following parts of the eye:
a hole in the middle of the iris.
What changes take place in the shape of eye-lens:
when the eye is focused on a near object?
Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside?
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
Which parts of the eye cause rays of light to converge on the retina?
What is presbyopia? Write two causes of this defect. Name the type of lens which can be used to correct presbyopia.
Having two eyes gives a person:
(a) deeper field of view
(b) coloured field of view
(c) rear field of view
(d) wider field of view
Given below is a set of five parts. Rewrite them in correct sequence.
Conjunctiva, retina, cornea, optic nerve, lens.
Sometimes you remember a vivid picture of a dream you saw. What is the role of your eyes in this experience?
With reference to the functioning of the eye, answer the question that follow:
What is the shape of the lens during distant vision?
Give the main function of the following:
Lachrymal glands
Answer the following question.
Trace the sequence of events Whichoccur when a bright light is focused on your eyes.
______ is the structural and functional unit of living organisms.
______ is a transparent layer.
Select the option with incorrect identification:
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 | e | power of accommodation |
Name the following:
Place of best vision in the retina of the eye.
