DP Biology (last assessment 2024)

Test builder »

Question 17N.3.SL.TZ0.02c

Select a Test
Date November 2017 Marks available [Maximum mark: 3] Reference code 17N.3.SL.TZ0.02c
Level SL Paper 3 Time zone TZ0
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 3]
17N.3.SL.TZ0.02c

Thin-layer chromatography was carried out on red and brown algae to discover what photosynthetic pigments they contained. The results were compared with the known pigments found in spinach leaves.

(c)

Explain how the pigments in the chromatogram of spinach are identified.

[3]

Markscheme

a. they can be identified by their colour/analysis with spectrometer

b. measure the distance travelled by the solvent front

c. measure the distance travelled by the pigment

d. calculate the Rf value

e. they can be identified by comparing Rf values to known values

[Max 3 Marks]

Syllabus sections