DP Biology (last assessment 2024)
Question 18M.3.SL.TZ2.1b
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.SL.TZ2.1b |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | Compare and contrast | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
18M.3.SL.TZ2.1b
Chromatography is a technique used to separate the components of a mixture. The photosynthetic pigments from three organisms were separated by thin layer chromatography: spinach (Spinacia oleracea), a red alga (Porphyra) and a brown alga (Fucus).
(b)
Compare and contrast absorption spectra and action spectra.
[2]
Markscheme
a. horizontal axis for both is wavelength/colour
OR
«for a chloroplast/cells/leaves/plants extract» they will have the same/similar shape
Marking point a. may be shown with a diagram.
b. an action spectrum shows the rate of photosynthesis «in chloroplasts/cells/leaves/plants» and an absorption spectrum shows the absorption of light
