An informative lesson that looks at how energy is lost at each stage of a food chain and how this affects the biomass of consumers. This lesson has been written for GCSE students but could be used with A-level students who are revisiting this ecology topic.
The lesson begins by posing a question to the students about why herbivores tend to be raised for food rather than carnivores to see how they would tackle it at this early stage. This exact question is revisited at the end of the lesson once learning has occurred so that students can monitor their own progress. Time is taken to look back at pyramids of biomass and food chains so that students are reminded of key terminology such as trophic level and also recognise that the biomass decreases at each level. A number of quick competitions have been written into the lesson to maintain engagement but also to introduce key terms and numbers (like 10%) in a different way. The main part of the lesson looks at how the energy is lost by organisms that leads to the decrease in biomass and links are made to related topics such as respiration and homeostasis.
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