DP Biology (first assessment 2025)
Question 20N.1B.SL.TZ0.3c
| Date | November 2020 | Marks available | [Maximum mark: 1] | Reference code | 20N.1B.SL.TZ0.3c |
| Level | SL | Paper | 1B | Time zone | TZ0 |
| Command term | Suggest | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 1]
20N.1B.SL.TZ0.3c
(c)
Suggest one other factor that has to be kept constant in all the jars during the experiment.
[1]
Markscheme
temperature/volume of indicator/identical jars/number of beads/size of beads / density of Chlorella / other reasonable answer
Do not accept light/pH/humidity.
Examiners report
A very large number of candidates suggested a valid factor that should be kept constant.
