Assess students' understanding of how photosynthesis and cellular respiration interrelate in plants and animals by testing identification of reactants/products (CO2, O2, glucose, H2O), roles of chloroplasts and mitochondria, energy transfer (ATP) and matter cycling, comparison of overall equations, and interpretation of diagrams showing gas exchange between organisms and ecosystems; include short explanations, simple stoichiometric reasoning, and diagram-based questions.