| Date | November 2020 | Marks available | 1 | Reference code | 20N.1.HL:.tz0.3 |
| Level | Higher Level | Paper | Paper 1 | Time zone | time zone 0 |
| Command term | What | Question number | 3 | Adapted from | N/A |
Question
What causes the change in blood acidity that results in increased ventilation?
A. Increased levels of carbon dioxide
B. Increased levels of oxygen
C. Decreased levels of carbon dioxide
D. Decreased levels of oxygen
Markscheme
A
Examiners report
Easy question.
