C4.2.7—Energy sources
Energy sources explains how energy flow, matter cycling, trophic transfer or carbon movement is represented, measured or limited within ecosystems.
- Syllabus
- First assessment 2025
- Objective
- C4.2.7
- Level
- HL
Concept essentials
- Energy sources must be linked to the correct source, store, transfer or loss process.
- The evidence for energy sources depends on distinguishing energy flow from matter cycling.
- Energy sources is clearer when arrows, units and trophic positions match the biological process.
- Data or diagrams for energy sources need interpretation as ecosystem transfer evidence.
ConceptIB Biology HL