C4.2.13—Heat loss
Heat loss explains how energy flow, matter cycling, trophic transfer or carbon movement is represented, measured or limited within ecosystems.
- Syllabus
- First assessment 2025
- Objective
- C4.2.13
- Level
- SL
Exam analysis
Chance of appearing1%of analysed past papers
Latest appearanceMay 2017
Most common paperPaper1
Typical marks1
Common command terms
- Identify
Scoring notes
- Common mistake
- Reversing food-web arrows instead of showing energy transfer direction.
Recent exam appearances
May 2017Paper1 ["SL"] · TZ217[ 1 ]C4.2.13—Heat loss
Practice this objective
Coverage 2017–2017 · Updated 16 Jul 2026
Concept essentials
- Heat loss must be linked to the correct source, store, transfer or loss process.
- The evidence for heat loss depends on distinguishing energy flow from matter cycling.
- Heat loss is clearer when arrows, units and trophic positions match the biological process.
- Data or diagrams for heat loss need interpretation as ecosystem transfer evidence.