An engaging and detailed lesson presentation (31 slides) that looks at how nitrogen is cycled and focuses on the different bacteria who play key roles in this cycle. The lesson begins by exploring why nitrogen is so critical for living organisms for the synthesis of DNA and proteins. Students are introduced to nitrogen-fixing bacteria to start and challenged to use their knowledge of interdependence to state the type of ecological relationship that is formed between them and the leguminous plant that they live on. Each stage of the cycle is complimented by a diagram highlighting that part so students are able to visualise how the cycle comes together. Time is taken to ensure that students recognise that any non-leguminous plants can only absorb nitrogen when it is nitrates form from the soil. Moving forwards, students will meet decomposers and nitrifying bacteria and again be shown where their function fits into the cycle. As the final part of the learning, students are challenged to consider what else is needed in order for this to be a cycle and will meet the denitrifying bacteria as a result. Progress checks, in a range of forms, have been written into this lesson at regular intervals so that students can assess their understanding and any misconceptions can be immediately addressed.
This lesson has been written for GCSE students, but could be used with A-level students who want to have a recap before extending their knowledge further.
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