| Date | May 2015 | Marks available | 2 | Reference code | 15M.3.SL.TZ2.14 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 2 |
| Command term | State | Question number | 14 | Adapted from | N/A |
Question
State the type of receptors that detect smell and temperature.
Smell: .........................................................
Temperature: .........................................................
[2]
a.
Annotate the diagram of the reflex arc to show the name and function of the neurons labelled I and II.
[2]
b.
Markscheme
a. smell: chemoreceptor; (do not accept olfactory)
b. temperature: thermoreceptors;
a.
b.
Examiners report
Most candidates knew thermoreceptors detected temperature but were uncertain about chemoreceptors in smell.
a.
Many candidates failed to realise that the action verb “annotate” requires more than a simple label.
b.
Syllabus sections
Option A: Neurobiology and behaviour » Option A: Neurobiology and behaviour (Core topics) » A.3 Perception of stimuli
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