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Date May 2018 Marks available 3 Reference code 18M.3.SL.TZ2.5
Level Standard level Paper Paper 3 Time zone Time zone 2
Command term Explain Question number 5 Adapted from N/A

Question

Label the pupil and the retina on the diagram.

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

[2]
a.

Explain the use of the pupil reflex as a test for brain damage.

[3]
b.

State the property of the nervous system that allows it to change with experience and allows the brain to recover from a stroke.

[1]
c.

Markscheme

retina

pupil

e.g: 

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

a.

a. «bright» light is shone in to the eye 

b. the pupil reflex is when the pupils constrict 

c. if not observed could indicate damage to the optic nerve/ocular motor nerve/medulla oblongata
OR
brain stem death
OR
depressant drug use

b.

plasticity

c.

Examiners report

 

a.

 

b.

 

c.

Syllabus sections

Option A: Neurobiology and behaviour » Option A: Neurobiology and behaviour (Core topics) » A.2 The human brain
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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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