DP Biology (last assessment 2024)

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Question 23M.3.SL.TZ1.4

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

Suggest an advantage of using animal experiments to identify the role of brain parts.

[1]

Markscheme

some brain structures/disorders/functions in animals are similar to humans
OR
(more) unethical/risk to use humans
OR
nervous system develops more rapidly in other animals (than in humans);

Examiners report

The similarity of brains and ethics were common answers.

(d)

Describe how fMRI can be used to assess brain function.

[2]

Markscheme
  1. (fMRI) shows active parts of the brain when stimulated;
  2. subject can be conscious;
  3. active parts of brain have increased blood flow/oxygenated haemoglobin;
  4. blood flow made visible by injecting a dye;
Examiners report

The use of fMRI was quite well known, with most candidates scoring at least one mark, usually for stimulation of the brain.