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Date November 2018 Marks available 4 Reference code 18N.3.SL.TZ0.7
Level Standard level Paper Paper 3 Time zone TZ0 / no time zone
Command term Explain Question number 7 Adapted from N/A

Question

The image shows an external view of the human ear.

Identify the structure labelled X.

[1]
a.

Explain how sound from an outside source causes movement of the hair cells in the cochlea.

[4]
b.

Markscheme

pinna/auricle ✔

a.

a. sound travels in «longitudinal» waves/vibrations ✔

b. vibrations in the air cause vibration of the eardrum ✔

c. the vibrations/sounds are passed on to the bones/ossicles «of the middle ear» ✔

d. the bones amplify the sound/vibrations ✔

e. «bones» transmit sound/vibrations to the oval window ✔

f. vibration of oval window causes fluid movement in the cochlea «in the inner ear» ✔

g. hair cells move with the vibrations/sound ✔

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

Option A: Neurobiology and behaviour » Option A: Neurobiology and behaviour (Core topics) » A.3 Perception of stimuli
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Option A: Neurobiology and behaviour » Option A: Neurobiology and behaviour (Core topics)
Option A: Neurobiology and behaviour

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