DP Biology (last assessment 2024)
Question 19M.3.SL.TZ1.4c
| Date | May 2019 | Marks available | [Maximum mark: 3] | Reference code | 19M.3.SL.TZ1.4c |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Explain | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 3]
19M.3.SL.TZ1.4c
The scan shows the brain of a patient affected by a stroke. The dark patch labelled X represents an area where cells have died.
[Source: Case courtesy of Dr Ahmed Abdrabou, Radiopaedia.org, rID: 36865]
(c)
Explain how studies of lesions have helped to identify the functions of different parts of the brain.
[3]
Markscheme
a. lesions are areas of brain injury ✔
b. diagnosed in living people using fMRI/CAT scan/PET scan ✔
c. autopsies reveal the position and extent of lesions/animal experimentation ✔
d. the behaviour/functioning of patient with lesion was observed ✔
Examiners report
Autopsies were more often mentioned than fMRIs. The link between position of a lesion and lost function was well understood.
