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Byju's Answer
Standard XII
Biology
Cochlea
The basilar m...
Question

The basilar membrane of cochlea

A
Is unaffected by movement of fluid in the scala vestibule
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B
Covers the oval window and round window
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C
Vibrate in a pattern determined by the form of travelling wave in the fluids of cochlea
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D
Vibrates when the body is subjected to linear acceleration
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Solution

The correct option is D Vibrates when the body is subjected to linear acceleration
Basilar membrane is present in inner ear which also contains vestibular apparatus. Linear acceleration is body is sensed by utricle and saccule of vestibular apparatus. This causes movement in cochlear fluid due to which basilar membrane vibrates. Basilar membrane also contains sensory receptor hair cells which are sensitive to sound waves.
So, the correct answer is 'Vibrates when body is subjected to linear acceleration'.

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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. 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. Choose the wrong statements with reference to human inner ear.
(a) Bony labyrinth divides into two areas namely cochlea and vestibule
(b) Scala vestibuli and scale media are separated by a membrane called Reissner's membrane
(c) Scala media and scala tympani are separated by basilar membrane
(d) Scala vestibuli and scala tympani are filled with endolymph.
Q.

Circulation of blood and movement of other fluids in the body are through forces set up by contraction of muscle cells of the heart.


Q. Match column I with column II and choose the correct option.
Column I Column II
(a) Cochlea (i) Ends at the oval window
(b) Scala vestibuli (ii) Coiled part of inner ear
(c) Organ of Corti (iii) Equalizes the pressure on either sides of the ear drum
(d) Eustachian tube (iv) Located on the basilar membrane

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