IB Biology HL C2.2.1 Neurons Questions
Practise labeling motor-neuron structures and identifying sensory, relay and motor neuron types through IB Biology exam questions.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Label a motor neuron’s cell body and nucleus, dendrites, axon, myelin sheath, nodes of Ranvier and motor end plates.
- Name the sensory, relay and motor neurons in a reflex arc, and identify that a motor neuron’s cell body lies in the CNS.
IB Biology HL C2.2.1 Neurons Questions question 1
[Maximum number: 4]
Draw a labeled diagram to show the structure of a motor neuron.
Award [1] for each of the following correctly drawn and labelled: cell body and nucleus - star shaped body with nucleus inside;
dendrites - as multiple long/narrow protrusions from the cell body;
axon - at least three times as long as the cell body not including the dendrites;
myelin sheath/Schwann cells and nodes of Ranvier - sheath with gaps/narrowings;
motor end plates - shown as widened ends of multiple branches of the nerve fibre;
Reject the points for axon and myelin sheath if the labelling line does not clearly point to the structure.
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