DP Biology (last assessment 2024)
Question 21M.1.SL.TZ2.12
| Date | May 2021 | Marks available | [Maximum mark: 1] | Reference code | 21M.1.SL.TZ2.12 |
| Level | SL | Paper | 1 | Time zone | TZ2 |
| Command term | Question number | 12 | Adapted from | N/A |
12.
[Maximum mark: 1]
21M.1.SL.TZ2.12
What does the Rf value in thin layer chromatography represent?
A. The distance travelled by the pigment front in a fixed time period
B. The distance from the origin to the solvent front at the end of the experiment
C. The ratio of distances travelled by the pigment and solvent fronts
D. The concentration of the pigment applied to the chromatography plate
[1]
Markscheme
C
Examiners report
It is appreciated that the candidates may not have had the opportunity to carry out the required practical work on photosynthesis and chromatography. It is assumed that the basic principles of chromatography and calculation of Rf values were taught in theory class.
