DP Biology (last assessment 2024)

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Question 23M.3.SL.TZ1.7

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Date May 2023 Marks available [Maximum mark: 4] Reference code 23M.3.SL.TZ1.7
Level SL Paper 3 Time zone TZ1
Command term Explain Question number 7 Adapted from N/A
7.
[Maximum mark: 4]
23M.3.SL.TZ1.7

Explain how neurons develop in embryonic tissue to allow communication.

[4]

Markscheme
  1. axon develops from (immature) neuron;
  2. chemical stimuli cause (direction of) growth;
  3. some neurons/axons migrate/extend to other areas;
  4. dendrites develop;
  5. (multiple) synapses form between neurons;
  6. synapses are strengthened with use;
  7. neural pruning causes unused synapses to be eliminated;
  8. neural plasticity allows new connections/synapses;
Examiners report

This was often well answered by those who read the question correctly. Others wrote about neurulation, ectoderm and endoderm rather than neurons.