IB skill practice

Analyse respiration pathways and energy yield

Paper 1, Paper 2 5 marks Difficulty 5

Locate respiration pathway stages

A respiration pathway in a Wellington plant productivity lab places glycolysis in the cytosol and the Krebs cycle plus oxidative phosphorylation in mitochondria. Explain why compartment location matters. Use the diagram labels, data values, or inheritance pattern before writing the answer. Enter the answer and choose the interpretation that best matches the HL Biology evidence.

Worked practice: biological evidence and answer

Use the labelled biological evidence first, then connect it to the final answer.