C4.2.17—Carbon cycle diagrams Topic Practice
C4.2.17—Carbon cycle diagrams Topic Practice

IB Biology syllabusBiology SL/HLFirst assessment 2025
Practise reading carbon cycle diagrams to trace CO2 use and release through photosynthesis, respiration, feeding and combustion.
How this is tested
- interpret arrows on carbon cycle diagrams as respiration, photosynthesis or combustion
- explain how plants transfer carbon from CO2 into organic compounds and food chains
- describe processes that release CO2, including respiration, decomposition and burning fuels
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