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C4.2.21—Dependence between respiration and photosynthesis Topic Practice

C4.2.21—Dependence between respiration and photosynthesis Topic Practice
IB Biology syllabusBiology SL/HLFirst assessment 2025

Students practise linking gas exchange between photosynthesis and respiration to explain O₂ and CO₂ cycling in ecosystems.

How this is tested

  • explain how chloroplasts and mitochondria form a reciprocal gas exchange system using O₂ and CO₂ as substrates
  • interpret net gas exchange data from light
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