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.
Topic 2.7 covers the carbon, nitrogen, and phosphorus cycles, including how human activities alter these natural processes. Students learn to draw and interpret cycle diagrams, explain key transformations, and evaluate the consequences of disrupted nutrient cycles for ecosystems.
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.
ESS is assessed through Paper 1 (case study) and Paper 2 (short answer & structured questions). Concepts from this topic may appear in either paper, often combined with data analysis or real-world examples.
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Start studying freeTopic 2.7 Biogeochemical cycles forms a core part of Unit 2: Ecology in IB ESS. 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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