Question 22N.1A.SL.TZ0.3
| Date | November 2022 | Marks available | [Maximum mark: 1] | Reference code | 22N.1A.SL.TZ0.3 |
| Level | SL | Paper | 1A | Time zone | TZ0 |
| Command term | Question number | 3 | Adapted from | N/A |
The diagram refers to questions 2 and 3. It shows a heterotrophic, unicellular, freshwater organism that has been placed in distilled water. The short arrows show movement of water and the long arrows show a sequence of steps.
What would happen if the unicellular organism was placed in a solution slightly less concentrated than the cytoplasm of the cell, rather than in distilled water?
A. The cell would become larger.
B. More water would be expelled from the cell.
C. X would fill more slowly.
D. X would not appear.
[1]
C
Question 3 caused much more difficulty for the candidates and discriminated very poorly with both the incorrect responses A and B being very common. The question may have been poorly worded as the concept is straightforward. If the cell is removed from the distilled water and placed in a solution that is more concentrated than the distilled water, but less concentrated than the cell, water will still enter the cell, but more slowly than previously. This would cause structure X to fill more slowly.
