| Date | May 2012 | Marks available | 1 | Reference code | 12M.3.SL.TZ1.14 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | Define | Question number | 14 | Adapted from | N/A |
Question
Define the term reflex in animal behaviour.
[1]
a.
Outline the main roles of motor, sensory and relay neurons in a spinal reflex arc.
[3]
b.
Markscheme
a rapid and unconscious/automatic response (to a stimulus)
a.
b.
Examiners report
This question was generally well answered; the majority of students could accurately define a reflex. Some answers however, did not refer to the rapid nature of the response.
a.
There were few good responses to this question, and it may be because the order of the neurons was different to the usual format. Most managed to give the role of the relay neuron, but in the other two, there were no references to the CNS or to receptors/effectors, with answers being generally very imprecise.
b.
Syllabus sections
Option A: Neurobiology and behaviour » Option A: Neurobiology and behaviour (Additional higher level topics) » A.4 Innate and learned behaviour
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