Advertisements
Advertisements
Question
Briefly explain the following terms: Power of accommodation
Solution
Power of accommodation:
The ability of the eye to adjust itself and to focus objects at different distances is known as the power of accommodation. The ciliary muscles contract and make the lens thicker to view nearby objects clearly, whereas they relax and make the lens thinner to focus on distant objects.
APPEARS IN
RELATED QUESTIONS
Explain how the human ear works.
Photoreceptor cells are present in __________.
(A) blind spot
(B) retina
(C) cochlea
(D) cornea
State the exact location of the Ciliary body
State the main function of the Suspensory ligament of the eye
Give scientific reasons: We cannot distinguish colours in moonlight.
The three parts of human ear contributing in hearing are-
Differentiate between members of the following pair with reference to what is asked in bracket.
Dynamic balance and static balance (Definition)
Where is the Semicircular canals located? Briefly mention its function.
Given below is the diagram of a part of the human ear. Study the same and answer the questions that follow:
 |
Give the collective biological term for Malleus, locus and Stapes.
Draw a labelled diagram of the inner ear.
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.
Differentiate between:
Cochlea and Concha.
Complete the following sentence with appropriate word :
________ is the organ of balance and hearing in the body.
The following diagram refers to the ear of a mammal.
(i) Label the parts 1 to 10 to which the guidelines point.
(ii) Which structure:
(a) converts sound waves into mechanical vibrations?
(b) Converts vibrations into nerve impulses?
(c) Responds to change in position?
(d) Transmits impulses to the brain?
(e) Equalizes atmospheric pressure and pressure in the ear.
Mention, if the following statement is True or False
Deafness is caused due to the rupturing of the pinna.
List the causes of noise pollution.
Given below is a diagrammatic representation of a part of the human ear.
- Name the parts numbered 1-6.
- Which parts of the ear shown here are complete.
 |
The median canal of cochlea is filled with ______.
Where are the following located?
Eustachian canal
Define the following term:
Ear ossicles
