This is a lesson which meets specification points within the WJEC GCSE ‘The Sciences’ Double Award (2026) spec, specifically from Unit 1.3 Systems (Biology).
The lesson starts with an introduction to the investigation. Food contains a range of nutrients that are essential for energy, growth and repair. In this investigation, chemical tests are used to identify the presence of key biological molecules in different food samples.
Iodine solution is used to test for starch, Benedict’s solution is used to test for glucose, and the Biuret test is used to detect proteins. By observing colour changes during these tests, it is possible to determine which nutrients are present in each sample.
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.
All resources are included. Thanks for looking, if you have any questions please let me know at swyftresources@gmail.com and any feedback would be appreciated.
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