DP Biology (first assessment 2025)
Question 19M.1B.SL.TZ1.2a.iii
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1B.SL.TZ1.2a.iii |
| Level | SL | Paper | 1B | Time zone | TZ1 |
| Command term | Suggest | Question number | a.iii | Adapted from | N/A |
a.iii.
[Maximum mark: 1]
19M.1B.SL.TZ1.2a.iii
(a.iii)
Other than humidity, suggest a variable that would need to be controlled in this experiment.
[1]
Markscheme
temperature/amount or type of feed «in the respirometer»/amount of CO2 absorber
OR
other reasonable suggestion ✔
Do not accept light
Examiners report
Often more than one answer was given but only the first was marked. Temperature and amount of feed were the most common answers.
