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Date May 2018 Marks available 2 Reference code 18M.3.SL.TZ1.6
Level Standard level Paper Paper 3 Time zone Time zone 1
Command term Compare and contrast Question number 6 Adapted from N/A

Question

The diagram shows the components of a cochlear implant system.

Identify the part of the ear labelled X.

[1]
a.

Compare and contrast the mechanisms involved in hearing sounds in individuals with and without cochlear implants.

[2]
b.

Outline the role of the ear in balance perception.

[2]
c.

Markscheme

semicircular canal(s)

a.

Compare:

a. sound transmitted by the auditory nerve in both cases
OR
both change sound waves to electrical impulses 

Contrast:

b. without CI cochlea stimulated by vibrations/middle ear bones whereas with CI electrical signals stimulate cochlea
OR
with a CI the auditory nerve is stimulated by electrodes whereas without CI the auditory nerve is stimulated by hair cells

One compare and one contrast must be given.

b.

a. head movements cause fluid in the canals to move 

b. this deflects hair cells 

c. (semicircular canals) are perpendicular/right angles detecting movements in any direction/plane 

d. send nerve impulses to the brain (by acoustic nerve)

c.

Examiners report

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

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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