Students are presented with two different diagrams showing the use of gases in
cellular respiration and photosynthesis and asked to explain which is correct.
1
• Student A says model A is correct because oxygen is a product of
photosynthesis and a reactant for cellular respiration
Student B says model B is correct because carbon dioxide is a product of
photosynthesis and a reactant for cellular respiration
Which student is correct and how could the model be improved?