C4.2.10—Trophic levels
Trophic levels explains how energy flow, matter cycling, trophic transfer or carbon movement is represented, measured or limited within ecosystems.
- Syllabus
- First assessment 2025
- Objective
- C4.2.10
- Level
- HL
Exam analysis
Chance of appearing14%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper1
Typical marks1
Common command terms
- Identify
- Explain
- Discuss
- Deduce
- Describe
- State
- Distinguish
- Suggest
Scoring notes
- Common mistake
- Reversing food-web arrows instead of showing energy transfer direction.
Recent exam appearances
May 2025Paper2 ["HL"] · TZ22(c)[ 1 ]C4.2.10—Trophic levels
November 2023Paper3 ["HL"] · TZ216(b)[ 1 ]C4.2.10—Trophic levels
May 2023Paper2 ["HL"] · TZ24(a)(ii)[ 2 ]C4.2.10—Trophic levels
May 2023Paper3 ["HL"] · TZ216(a)[ 1 ]C4.2.10—Trophic levels
May 2023Paper3 ["HL"] · TZ115(a)[ 1 ]C4.2.10—Trophic levels
Practice this objective
Coverage 2012–2025 · Updated 16 Jul 2026
Concept essentials
- Trophic levels must be linked to the correct source, store, transfer or loss process.
- The evidence for trophic levels depends on distinguishing energy flow from matter cycling.
- Trophic levels is clearer when arrows, units and trophic positions match the biological process.
- Data or diagrams for trophic levels need interpretation as ecosystem transfer evidence.