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प्रश्न
State the functions of the following:
Iris
Write the main functional activity of the following structure.
उत्तर
Controls the size of the pupil and the amount of light entering the eye. It also affects the colour of the eyes.
संबंधित प्रश्न
Write the function of the following part of the human eye: ciliary muscles
How does the eye regulate the amount of light that falls on the retina?
State whether the following statement is true or false:
The image formed on our retina is upside-down
What do the ciliary muscles do when you are focusing on a nearby object?
How does the eye adjust itself to deal with light of varying intensity?
Why does the eye-lens not have to do all the work of converging incoming light rays?
fill in the following blank with suitable word:
A person is short-sighted if his eyeball is too............Spectacles with a .............lens are needed. A person is long-sighted if his eyeball is too............Spectacles with a ................lens are needed. These focus light rays exactly on to the..........
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
State whether the following statement is true or false:
Rabbit has eyes which look sideways.
With reference to the functioning of the eye, answer the question that follow:
What is the shape of the lens during distant vision?
What is the function of iris and the muscles connected to the lens in human eye?
Label the following diagram :
Give Technical Term:
The cells of the retina that are sensitive to colour.
Long answer question
Draw the neat labelled diagram of the Sectional view of the human eye.
The pigmented circular area seen in front of the eye:
Given below is a cross section of the human eye. Match the structures marked (a) to (e) with their correct functions:
Example: (f) - 6. Holds the lens in position
| Cross section of Human Eye | Functions | |
 |
1. | Protects retina |
| 2. | Regulates the size of the pupil | |
| 3. | Alters the shape of the lens | |
| 4. | Keeps the lens moist | |
| 5. | Transmits nerve impulses to brain | |
| 6. | Holds the lens in position |
Name the following:
Place of best vision in the retina of the eye.
Name the following:
Place of no vision in the retina of the eye.
Name the following:
Two pigments of the sensory cells.
With reference to human eye answer the question that follow:
Name the part of the eye associated with keeping the lens moist and protecting it from physical shock.
