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Leaf Disk Photosynthesis Assay

Make leaf disks sink and time how long they take to float as photosynthesis fills them with oxygen.

Grade 9ExperimentScience OlympiadScienceBiologyEnvironmental ScienceData AnalysisIntermediate1 to 1.7 hr8 materialsAdult supervision required

What you'll learn

  • Explain photosynthesis and the role of carbon dioxide and light
  • Use the time for disks to float as a measure of rate
  • Graph the effect of a variable on rate

Objective

Measure the rate of photosynthesis using floating leaf disks and test how light intensity changes it.

STEM concepts

PhotosynthesisGas exchangeLimiting factorsRate of reaction
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Why does it work, challenge and project report

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