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Byju's Answer
Standard X
Biology
External and Middle Ear
1.The ears ar...
Question

1.The ears are fragile instruments.
A. These impulses travel via the auditory nerve to the brain, where they are interpreted as, say, words, music or an approaching vehicle.
B. When sound waves enter the ear, they cause the eardrum to vibrate.
C. These, in turn, stimulate auditory nerve fibers, each attuned to a different frequency.
D. The vibrations are transmitted to the cochlea, in the inner ear, where fluid carries them to neatly organized rows of hair cells.
6. Damage to this delicate apparatus results from both volume and length of exposure to sound.

A
BCAD
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B
DABC
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C
BDCA
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D
BDAC
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Solution

The correct option is C BDCA
Here the sentences form a chronological pattern. B should follow sentence 1. BD is a mandatory pair as both talks about vibration. A6 is also a mandatory pair as both mention the sound. Hence option (3) is the answer.

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Q. The part of the ear that transmits sound vibrations to the brain is the
(a) cochlea.
(b) stirrup.
(c) eardrum.
(d) auditory nerve.
Q. Following is a list of the events (in a random order) that lead to the formation of an auditory impulse.
(i) Vibration is transferred from the malleus to the incus to the stapes.
(ii) Basilar membrane moves up and down.
(iii) Nerve impulse is transmitted in cochlear nerve to auditory cortex of brain for impulse analysis and recognitions.
(iv) Sound waves pass through ear canal.
(v) Stereocilia of hair cells of organ of Corti rub against tectorial membrane.
(vi) Sound waves cause ear drum to vibrate.
(vii) Nerve impulse is generated.
(viii) Vibrations move from fluid of vestibular canal to the fluid of tympanic canal.
(viii) Vibrations move from fluid of vestibular canal to the fluid of tympanic canal.
(ix) Membrane at oval window vibrates.
Which of the following options represents these events in a correct order?
Q. Put these terms, which describe the way sound travels from the air through your ear, in the correct sequence:
three tiny bones in the middle ear vibrate;your outer ear catches the sound and moves it inside your ear; a special nerve carries messages about sound to your brain; your eardrum begins to vibrate; liquid in the coiled tube of your inner ear vibrates
Q. Match column I with column II and select the correct option from the given codes.
Column IColumn II
A. Pinna(i) Collects vibrations in the air which produces sound
B. Ear canal(ii) Passage for sound wave from pinna to ear drum
C. Tympanic membrane(iii) Transfers sound wave to ear ossicles
D. Ear ossicles(iv) Increases the efficiency of transmission of sound waves to the inner ear
E. Cochlea(v) Has hearing receptors
F. Eustachian tube(vi) Equalises the pressure on both sides of ear drum
G. Auditory nerves(vii) Impulse transfer from organ of Corti to auditory cortex in temporal lobe of cerebrum

Q. Assertion :Hair cells on the basilar membrane (the organ of Corti) are responsible for hearing. Reason: Pressure waves, which begin at the oval window, cause the basilar membrane to vibrate, so that the cilia of the hair cells touch the tectorial membrane. This causes the hair cells to initiate nerve impulses, which are carried by the auditory nerve to the brain.
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