Study Photosynthesis with the Floating Leaf Disk Assay
- Explain what happens during photosynthesis.
- Design and conduct an experiment to investigate variables that might affect the rate of photosynthesis.
- Graph and analyze experimental results to interpret and compare photosynthesis rates.
![]() OverviewPlants carry out photosynthesis to produce sugars that they need as an energy source to live and grow. During photosynthesis, oxygen—a gas that many living beings need to survive—is released. This makes photosynthesis one of the most important biological processes on Earth. In Part 1 of this lesson plan, students will utilize the floating leaf disk assay to demonstrate the production of oxygen gas during photosynthesis. They will then continue to design and conduct their own experiments in Part 2 of the lesson in order to investigate variables that affect the rate of photosynthesis in plants. Remote learning adaptation: This lesson plan can be conducted remotely. The Engage section of the lesson can be skipped or done over a video call, then students can work independently during the Explore sections, using the Student Worksheet and the Leaf Disk Assay Video as a guide. Students will need to obtain their own materials such as a light source and a plastic syringe. For Part 2 of the lesson, students can adjust the independent variable they will investigate according to the materials available to them. The data analysis in the Reflect sections and the presentations of the results can be done over a video call, or by sharing a poster or slides on a class drive. NGSS AlignmentThis lesson helps students prepare for these Next Generation Science Standards Performance Expectations:
Materials![]() For each student group of 3:
For teacher:
Extra materials for independent student investigations:
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Grade Range
6th-8th
Group Size
3 students
Active Time
Part 1: 1 h 40 minutes, Part 2: 1 hour 45 minutes
Total Time
Part 1: 1 h 40 minutes, Part 2: 1 hour 45 minutes
Area of Science
Plant Biology
Key Concepts
Photosynthesis
Credits
Svenja Lohner, PhD, Science Buddies
Learning Objectives
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