DP Biology (last assessment 2024)
Question 19N.3.HL.TZ0.4b
| Date | November 2019 | Marks available | [Maximum mark: 1] | Reference code | 19N.3.HL.TZ0.4b |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Outline | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
19N.3.HL.TZ0.4b
The figures below show a human and a sheep brain.
[Source: Pearson Scott Foresman, donated to the Wikimedia Foundation,
https://commons.wikimedia.org/wiki/File:Convolution_he_-_sheep_and_human_brain.png]
(b)
Outline the main feature of neural pruning.
[1]
Markscheme
a. loss of unused neurons ✔ Accept apoptosis or programmed neuron death.
b. loss of unused synapses
OR
reducing the number of synapses
OR
leaving more efficient synaptic configurations ✔ Do not accept "connection" instead of "synapse".
