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B io Factsheet
September 1997 Number 2

The essential guide to photosynthesis
Photosynthesis is the use of light energy from the sun to fix carbon dioxide i.e. turn it into sugars. These sugars can then be converted
into other essential substances - fats and proteins etc. - which plants need…

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The essential guide to photosynthesis Bio Factsheet

Figure 2. The Biochemistry of Photosynthesis 1. Light energy is absorbed by chlorophyll molecules in PSI and
6 (b) PSII.
6 (a) e- carrier PSI: Photosystem 1 2. The electrons in the chlorophyll molecules are boosted to a
4e- PSII: Photosystem 2…

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The essential guide to photosynthesis Bio Factsheet

Photosynthesis investigations

Figure 3. Using Elodea Separating Chlorophyll Pigments
Thermometer 1. Cut up green leaves and macerate
with a solvent eg. acetone.
Single wavelength Water Calibrated scale (allows Maceration breaks cell walls,
of light (to volume of released O2 to
absorb releasing chlorophyll,…

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The essential guide to photosynthesis Bio Factsheet

Practice Questions Answers
(semicolons indicate marking points)
1. Define the term action spectrum
(2 marks) 7. The diagram below shows the absorption 1. A graph;
and action spectra for some chloroplast which shows the effectiveness of
2. Distinguish between cyclic and non-cyclic pigments.…




Great resource!



Thanks, this is very useful.

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