Key Idea: Topic 2.7 explains the difference between energy flow and matter cycling, how matter moves through ecosystems via stores and flows, and how human activities disrupt carbon, nitrogen, and water cycles.
At Higher Level, Topic 2.7 requires detailed quantitative analysis of carbon, nitrogen, and phosphorus fluxes, including human perturbation of cycle rates. HL students study additional transformations in each cycle and evaluate the broader consequences of disrupted biogeochemical processes.
Key Idea: Topic 2.7 explains the difference between energy flow and matter cycling, how matter moves through ecosystems via stores and flows, and how human activities disrupt carbon, nitrogen, and water cycles.
At Higher Level, ESS includes an extended essay component and deeper analytical questioning. Expect longer data-response questions and more complex case study scenarios in both Paper 1 and Paper 2.
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Start studying freeTopic 2.7 Biogeochemical cycles forms a core part of Unit 2: Ecology in IB ESS HL. Mastering these concepts will strengthen your understanding of connected topics across the syllabus and prepare you for exam questions that require analysis, evaluation, and real-world application.
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