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This lesson covers the practical investigation of photosynthesis, including Core Practical 5 from the Edexcel GCSE Biology (1BI0) specification. You need to understand the method, variables, analysis and evaluation of the pondweed experiment, as well as the starch test and the variegated leaf experiment.
To investigate how light intensity affects the rate of photosynthesis in an aquatic plant (such as Elodea or Cabomba — commonly called pondweed).
When an aquatic plant photosynthesises, it releases oxygen gas as a by-product. By measuring the rate of oxygen production (either by counting bubbles or collecting the gas), we can determine the rate of photosynthesis at different light intensities.
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