Question 20N.1B.SL.TZ0.3d
| Date | November 2020 | Marks available | [Maximum mark: 2] | Reference code | 20N.1B.SL.TZ0.3d |
| Level | SL | Paper | 1B | Time zone | TZ0 |
| Command term | Outline | Question number | d | Adapted from | N/A |
A chromatograph was made of the photosynthetic pigments of a leaf of the plant.
[Source: Adapted from “Diversity of Photosynthetic Pigments” by Alexander F. Motten in Tested Studies for
Laboratory Teaching, Volume 16 of the Association for Biology Laboratory Education and used by permission of the
author.]
Outline what measurements would be taken to identify pigment X.
[2]
a. the distance travelled from the origin/O to the solvent front;
b. the distance travelled by the pigment (from the origin O to X);
Accept X to solvent front if the candidate indicates that this allows O to X to be calculated.
Most candidates managed to outline what measurements would be taken to identify the pigment on the chromatogram with many identifying the pigment although this was not required.
