This is a lesson which meets specification points within the AQA GCSE Biology specification.

The lesson begins with an introduction to the investigation. Light is one of the factors which affects the rate of photosynthesis. In this investigation a green plant named Canadian pondweed (Elodea) will produce bubbles of oxygen as a result of photosynthesis. The number of bubbles of oxygen produced is affected by light intensity.

The next couple of slides outline the equipment needed and the method list for this investigation. Students will then ‘Think > Pair > Share’ their ideas about a results table should look like. After a class discussion, the teacher can draw some example tables on the board so students have an idea about what they need to include for their results table.

After this, in pairs/groups students should have another discussion about the control variables and potential sources of error in the investigation. Some examples for each of these are included in the PowerPoint for the teacher to go through.

Now, students can complete the investigation, recording their results as they go. Once complete there are a set of analysis questions for them to answer, based upon the results they have collected.

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