Light and Photosynthesis Lab
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Light and Photosynthesis Lab
Plan a Fair Test
A class investigates how the distance between a lamp and an aquatic plant affects photosynthesis. They count oxygen bubbles released during a timed test. Keep other conditions consistent, such as plant size, water volume, carbon dioxide supply, and water temperature.
- The water’s color
- The number of oxygen bubbles released
- The height of the lamp
- The water volume
- The distance from the lamp to the plant
- The number of bubbles counted
- The plant’s species
- The length of the test
- Use the same amount of water in each test.
- Change lamp distance and water temperature together.
- Use an equal-sized piece of the same plant for each test.
- Count bubbles for a different length of time at each distance.
- Independent variable
- Dependent variable
- Controlled variable
- A condition kept the same
- The factor deliberately changed
- The outcome measured or counted
Collect and Interpret Data
A student team tested the same plant setup for two minutes at each lamp distance. Their average bubble counts are shown below.
Lamp distance (cm)
Average bubbles
8
20
16
11
32
4
2 printable pages
Page 1
Page 2
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