DP Biology (first assessment 2025)
Question 19M.1B.SL.TZ2.a
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1B.SL.TZ2.a |
| Level | SL | Paper | 1B | Time zone | TZ2 |
| Command term | State | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
19M.1B.SL.TZ2.a
State one other variable that should have been controlled in this study.
[1]
Markscheme
age/height/fitness level/weight/room temperature/rest in between tests/model or type of bike ✔
Other valid factor. Only mark first factor listed.
Do not accept sex, health, smoking, oxygen level or altitude as this already listed.
Examiners report
In this question the candidates were asked to look at data on the effect of exercise and altitude on ventilation rate. Most candidates could state one other variable that should have been controlled in this study.
