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प्रश्न
Mention if the following statement is true (T) or false (F) Give reason.
Ciliary muscles regulate the size of the pupil
विकल्प
True
False
उत्तर
False
Ciliary muscles regulate the size of the lens.
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संबंधित प्रश्न
Write short notes on the following: Retina
Explain the following:
Mechanism of generation of light-induced impulse in the retina.
Out of rods and cones m the retina of your eye:
which detect colour?
Fill in the following blank with suitable word:
The iris controls the amount of................entering the eye.
There are two types of light-sensitive cells in the human eye:
Where are they found?
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
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
Name the respective organs in which the following are located and mention the main function of each:
(i) Iris
(ii) Semicircular canals
The diagram alongside represents a certain defect of vision of the human eye.
(i) Name the defect.
(ii) Describe briefly the condition in the eye responsible for the defect.
(iii) Redraw the figure by adding a suitable lens correcting the defect. Label the parts through which light-rays pass.
(iv) What special advantage do human beings derive in having both eyes facing forward?
What is a Lachrymal gland?
State the Function:
Iris
The following figure show the change in the shape of the lens while seeing distant and nearby objects. Complete the figures by correctly labelling the diagram.
Draw the struture of human eye and label its parts.
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) |
In human eye the part which allows light to enter into the eye is ______.
| 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 accomodation |
Name the following:
Kind of retinal cells sensitive to dim light.
Match the terms in column I with those in column II and write down the matching pairs.
| Column I | Column II | ||
| (i) | Conjunctiva | (a) | Viral infection |
| (ii) | Cornea | (b) | Ciliary body |
| (iii) | Choroid | (c) | Spiral-shaped |
| (iv) | Cochlea | (d) | Transparent epithelium |
| (v) | Conjunctivitis | (e) | Suspensory ligament |
| (f) | Contains melanin | ||
| (g) | Transparent but appears black |
