DP Biology (first assessment 2025)
Question 21N.2.SL.TZ0.3a
| Date | November 2021 | Marks available | [Maximum mark: 1] | Reference code | 21N.2.SL.TZ0.3a |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Outline | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
21N.2.SL.TZ0.3a
(a)
The image shows human red blood cells.
[Source: someoneice/123rf.com.]
Outline what will happen to human red blood cells if transferred to distilled water.
[1]
Markscheme
cells absorb water by osmosis and swell/increase in volume
OR
cells burst/lyse;
Examiners report
This was mostly well answered with candidates realising that water entry due to osmosis would cause the cells to burst.
