| Date | November 2016 | Marks available | 1 | Reference code | 16N.3.SL.TZ0.7 |
| Level | Standard level | Paper | Paper 3 | Time zone | TZ0 |
| Command term | Identify | Question number | 7 | Adapted from | N/A |
Question
The image shows a human eye.
Identify the structures labelled I and II
[1]
a.
Explain how the pupil of the eye can be used to assess brain damage.
[4]
b.
Markscheme
I: conjunctiva/sclera
AND
II: iris/cornea
To award [1] both answers are needed.
a.
a. bright lights causes the pupil to constrict/iris to increase in size
b. low light causes the pupil to dilate/iris decrease in size
c. these are reflex actions
d. the test for brain damage is to (briefly) shine a bright light in the eyes
e. slow or unresponsive change in pupil size indicates brain damage/concussion
f. different response of each eye indicates brain damage/concussion
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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