DP Biology (last assessment 2024)
Question 18M.1.HL.TZ2.9
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.1.HL.TZ2.9 |
| Level | HL | Paper | 1 | Time zone | TZ2 |
| Command term | Question number | 9 | Adapted from | N/A |
9.
[Maximum mark: 1]
18M.1.HL.TZ2.9
What is a requirement for accurate measurements of the rate of respiration using a respirometer?
A. CO2 must be absorbed by water so that only O2 production is measured.
B. Temperature must be kept constant so the volume changes are only due to O2 use.
C. Anaerobic organisms are better to use than aerobic ones as they will produce larger volume changes.
D. Warm-blooded animals are better to use than cold-blooded animals as they do not change the temperature of the container.
[1]
Markscheme
B
