How Do We Hear

Q. Where does the scala vestibuli start and scala tympani terminate respectively?

1. Scala media, temporal bone
2. Oval window, round window
3. Pinna, tympanic membrane
4. Eustachian tube, external auditory meatus

Q. Organ of corti is present in

1. external ear
2. middle ear
3. cochlea
4. semicircular canal

Q. Mechanism of ear and eye [in points]

Q.

What part of the ear converts sound waves into mechanical vibrations?

Q. The range of human hearing is from to .

1. 20 Hz
2. 30 Hz
3. 20 kHz
4. 15 kHz
5. 8 Hz
6. 8 kHz

Q. Assertion: All motor neurons carry nerve impulses from the spinal cord to the brain.

Reason: Motor neurons conduct nerve impulses from the spinal cord to the brain.

1. Both assertion and reason are true and reason is the correct explanation of assertion
2. Both assertion and reason are true but reason is not the correct explanation of assertion
3. Both assertion and reason are false
4. Assertion is true but reason is false

Q.

What is tympanum in insects?

Q.

The functional unit of hearing is

1. Utricle

2. Organ of Corti

3. Crista

4. Incus

Q.

The organ that helps in hearing is

1. Cochlea

2. Organ of Corti

3. Semicircular canals

4. Ear ossicles

Q.

Mention the exact location of the malleus?

Q. Match the following and select the correct option.
$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \left(a\right)& \text{Organ of Corti}& \left(i\right)& \text{Connects middle ear and pharynx}\\ \left(b\right)& \text{Cochlea}& \left(ii\right)& \text{Coiled part of the labyrinth}\\ \left(c\right)& \text{Eustachian tube}& \left(iii\right)& \text{Attached to the oval window}\\ \left(d\right)& \text{Stapes}& \left(iv\right)& \text{Located on the basilar membrane}\end{array}$

1. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
2. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
3. (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
4. (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)

Q.

The -------------- are concerned with maintaining body balance. (auditory canals/semicircular canals)

Q. Organ of Corti is found in the ____.

1. inner ear
2. nasal chamber
3. epidermis
4. pinna

Q. In which part of the ear is the organ of Corti is located?

1. Auricle
2. External ear
3. Inner ear
4. Middle ear

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?

1. (iv), (vi), (i), (ix), (viii), (ii), (v), (vii), (iii)
2. (i), (ii), (iii), (iv), (v), (vi), (vii), (viii), (ix)
3. (ix), (viii), (vii), (vi), (v), (iv), (iii), (ii), (i)
4. (iv), (vi), (i), (viii), (ix), (ii), (v), (vii), (iii)

Q.

Rewrite and complete the following part:

i) Eye:Optic nerve::Ear:____________.

ii) Iris of eye:_____________.

Q. A sensory structure in cochlea which helps in hearing.

Q. Pitch of sound is determined by its

1. Frequency
2. Speed
3. Amplitude
4. Loudness

Q.

Hearing is controlled by

1. Cerebellum

2. Cerebrum

3. Temporal lobes

4. Hypothalamus

Q. Identify the wrong statement regarding the mechanism of hearing.

1. External ear receives and directs the sound waves to ear drum
2. Vibrations produced in ear drum are transmitted through ear ossicles and oval window to fluid-filled inner ear
3. Nerve impulses are generated and transmitted by efferent fibres to the auditory cortex of brain
4. Movement of basilar membrane bends the hair cells
5. Cerebellum integrates information from semicircular canals of ear and auditory system.

Q.

Regarding the Ear and hearing in Humans, Identify the correct statement(s).

1. The ear is most sensitive to frequencies between about 100 Hz and 300 Hz

2. The endolymph of the scala media is similar in composition to plasma.

3. Conductive hearing loss is loss of hearing due to defects in the sound conducting structures and due to defects in the vestibulocochlear nerve

4. The range of human hearing is from 20 Hz to 20 kHz

Q. Briefly describe how the following actions take place
(i) The oval window of the inner ear vibrates (ii) The pupil of the eye becomes smaller

Q. The range of human hearing is from to .

1. 20 Hz
2. 30 Hz
3. 20 kHz
4. 15 kHz
5. 8 Hz
6. 8 kHz

Q. what is the meaning of low pitch and high amplitude ?

Q. Sound is transmitted from middle ear to internal ear due to

1. All of the above
2. Vibrations of tympanum
3. Striking of stapes
4. Vibrations of stapes

Q. The correct path followed by sound waves from external ear to inner ear is

1. Ear drum - basilar membrane - auditory ossicles - fluid of cochlea - hair cells
2. Ear drum - hair cells - auditory ossicles - basilar membrane - fluid of cochlea
3. Ear drum - fluid of cochlea - auditory ossicles - hair cells - basilar membrane
4. Ear drum - auditory ossicles - fluid of cochlea - basilar membrane - hair cells

Q. Draw a labelled diagram of the ear. Write a note on the mechanism of hearing.

Q. Correct sequence of regions in organisation of auditory mechanoreceptor organ is

1. Pinna - Tympanic membrane - Auditory canal - Cochlea - Malleus - Incus - Stapes - Auditory nerve
2. Pinna - Auditory canal - Tympanic membrane - Malleus - Incus - Stapes - Cochlea - Auditory nerve
3. Pinna - Malleus - Incus - Stapes - Auditory canal - Tympanic membrane - Cochlea - Auditory nerve
4. Pinna - Cochlea - Tympanic membrane - Auditory membrane - Auditory canal - Incus - Malleus - Stapes - Cochlea - Auditory nerve
5. Pinna - Tympanic membrane - Auditory canal - Incus - Malleus - Stapes - Cochlea - Auditory nerve.

Q. Explain how our ear works as an organ of hearing.

Q. The damage to ear by sudden explosion (loud sound) is prevented by

1. Tensor tympani muscles
2. Eustachian tubes
3. Stapedius muscles
4. All of the above