| Date | November 2020 | Marks available | 1 | Reference code | 20N.1.SL.tz0.6 |
| Level | Standard Level | Paper | Paper 1 | Time zone | time zone 0 |
| Command term | What | Question number | 6 | Adapted from | N/A |
Question
What promotes passive diffusion during inspiration?
Markscheme
C
Examiners report
The sixth most challenging question (63.77 %). The principal distractor was D. This indicates an understanding that diffusion requires a pressure gradient, but confusion over the direction thereof in the pulmonary capillaries.
