Advertisements
Advertisements
प्रश्न
What is a lacrimal gland?
उत्तर
Lacrimal gland is a tear gland located at the upper sideward portion of the eye orbit. Its secreation lubricates the surface of the eye, washes always the dust particles and kills germs
APPEARS IN
संबंधित प्रश्न
Distinguish between: blind spot and yellow spot
Name the part of our eyes which helps us to focus near and distant objects in quick succession.
Draw a simple diagram of the human eye and label clearly the cornea, iris, pupil, ciliary muscles, eye-lens, retina, optic nerve and blind spot.
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
Suggest how your irises help to protect the retinas of your eyes from damage by bright light.
What is presbyopia? Write two causes of this defect. Name the type of lens which can be used to correct presbyopia.
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
The region in the eyes where the rods and cones are located is the
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 main functions of the following:
Coronary Artery
Name the following:
White part of the eye.
Name the respective organs in which the following are located and mention the main function of each:
(i) Iris
(ii) Semicircular canals
Differentiate between:
Vitreous humour and Aqueous humour.
Name the following:
The part of the eye responsible for change in the size of the pupil.
What is the nature of the image that forms on the retina?
Mention, if the following statement is True or False
The least distance of distinct vision for the human eye is 25 cm
Choose the Odd One Out:
The larynx has fold of tissue which vibrate with the passage of air to produce sound.
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 |
With reference to human eye answer the question that follow:
Name the part of the eye associated with the regulation of the size of pupil.
