An experiment to investigate photosynthesis, showing the evolution of oxygen from a water plant, the production of starch and the requirements of light, carbon dioxide and chlorophyll.
Remember: Photosynthesis experiment = pondweed
This experiment will involve pondweed and a white leaved plant.
1. Add pondweed to a beaker of water with a known volume.
2. Add the white leaved plant to another beaker of water with the same volume.
3. Add the same volume of baking powder to increase the carbon dioxide levels.
4. Place two desk lamps 10cm away from each beaker.
5. Leave for five minutes so that the plants can accustom to the new light intensity.
6. After five minutes, count how many bubbles are emitted from each plant during a period of a minute.
7. After noting this down, move the desk lamps further away by 10cm.
8. Wait for five minutes then count how many bubbles are emitted from each plant for a period of a minute.
9. Repeat this process, moving the desk lamp back by 10cm then counting the number of bubbles.
10. Continue until the lamp is 50cm away from the plant[s].
Independent variable = light intensity
Dependent variable = bubbles omitted.
Controlled variables = size of each plant and temperature of the water.
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