Assess ability to design and analyze a controlled experiment comparing photosynthesis rates at different light intensities. Items tested include formulating testable hypotheses; identifying independent, dependent, and controlled variables; selecting appropriate measurement methods (e.g., oxygen production, CO2 uptake, floating leaf disks, chlorophyll fluorescence); planning replication and controls; choosing light sources and intensity treatments; outlining data collection and basic statistical comparisons; and identifying potential sources of error, safety concerns, and interpretation of expected results.