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Byju's Answer
Standard XII
Biology
Nerve Impulse Conduction
Sensation of ...
Question

Sensation of hearing is produced as a result of the

A
Presence of the helicotrema
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B
Vibrations set in the external auditory meatus
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C
Vibrations of the ear ossicles
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D
Nerve impulses generated by the hair cells of the organ of Corti
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Solution

The correct option is D Nerve impulses generated by the hair cells of the organ of Corti
Within the bony labyrinth, is the membranous labyrinth; filled with the fluid called as endolymph. The membranous labyrinth within the cochlea contains the organ of Corti containing the inner and outer hair cells, that generate the nerve impulses required for hearing. Nerve impulses generated in the inner ear travel along the vestibulocochlear nerve (cranial nerve VIII) to the brain.

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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.
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. 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.
Q. In the internal ear, the organ of Corti which bears hairs cells is located in
Q. Assertion : Ear is a sense organ of hearing.
Reason : Auditory receptors which sense the sound are present in the ear.
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