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Date	November 2019	Marks available	1	Reference code	19N.3.SL.TZ0.6
Level	Standard level	Paper	Paper 3	Time zone	TZ0 / no time zone
Command term	Draw	Question number	6	Adapted from	N/A

Question

The diagram shows part of a human retina.

[Source: reprinted by permission from Springer Nature: Nature Reviews Neuroscience Parallel processing in
the mammalian retina, Heinz Wässle, 2004, Nat Rev Neurosci 5, 747–757 (2004) doi:10.1038/nrn1497]

On the diagram, draw an arrow showing the direction of the light.

[1]

a.

Identify the cells labelled A and B.

A:

B:

[1]

b.

Explain, using the diagram, how the visual stimuli from the right eye reach the visual cortex of the brain.

[3]

c.

Markscheme

[Source: reprinted by permission from Springer Nature: Nature Reviews Neuroscience
Parallel processing in the mammalian retina, Heinz Wässle, 2004,
Nat Rev Neurosci 5, 747–757 (2004) doi:10.1038/nrn1497]

Accept any arrow pointing upwards

a.

A: bipolar cell
B: ganglion cell ✔

Both required

b.

a. right eye receives information/stimuli/light from both «left and right» visual field ✔

b. light from the left visual field goes to the right side of the retina
OR
vice versa ✔

c. impulses «from retina» carried along the optic nerve ✔

d. «optic» nerves cross at «optic» chiasma ✔

e. impulses from the left side of the retina goes to the left side of the brain
OR
vice versa ✔

Accept any of these points made on an annotated diagram.

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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[Source: Holly Fischer https://en.wikipedia.org/wiki/Human_eye#/media/File:Three_Internal_chambers_of_the_Eye.png]

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Option A: Neurobiology and behaviour » Option A: Neurobiology and behaviour (Core topics)

Option A: Neurobiology and behaviour