Advertisements
Advertisements
प्रश्न
Given below is a diagram depicting a defect of the human eye, study the same and then answer the questions that follow:
(i) Name the defect shown in the diagram.
(ii) What are the two possible that cause this defect?
(iii) Name the type of lens used to correct this defect.
(iv) With the help of a diagram show how the defect shown above is rectified using a suitable lens.
Advertisements
उत्तर
(i) Myopia
(ii) Two possible reasons are
- Eye ball is lengthened from front to back.
- Lens is too curved.
(iii) Concave lens
(iv)
APPEARS IN
संबंधित प्रश्न
The ear ossicle which is attached to the tympanum.
Sclerotic layer or choroid layer.(Which one forms the Iris ?)
Draw a neat and labelled diagram of the human ear. With the help of this diagram, explain the construction and working of the human ear.
Long answer question
Draw the neat labelled diagram of the human ear.
Select the CORRECT match of part of the human ear and its function.
Assertion: Human beings Cannot hear infrasonic sounds.
Reason: Sound with a frequency less than 20 Hz is called infrasonic sound.
The eardrum is known as ______.
The spiral organ possessing sensory cells for hearing is ______.
Which of the following structures equalises the air pressure on either side of the tympanum?
- Draw a neat and well labelled diagram of the membranous labyrinth found in the inner ear.
- Based on the diagram drawn above in (i), give a suitable term for each of the following descriptions:
- The structure responsible for hearing.
- The sensory cells that help in hearing.
- The membrane-covered opening that connects the middle ear to inner ear.
- The nerves that carry impulses from the ear to the brain.
- The tube which equalises the air pressure on either side of the ear drum.
