Practical:
1) First you place the pondweed in a boiling tube of water and then place it in a test tube rack, then you place a light source at a specific distance from the pondweeds.
2) Then you turn on the lamp and the pondweed is left to photosynthesise for a set amount of time and the oxygen released will collect in the capillary tube.
3) At the end of the experiment, the syringe is used to draw the gas bubble in the tube up alongside a ruler and the length of the gas bubble is measured. This is proportional to the volume of CO2 produced.
4) Any variables that could affect the results should be controlled:
- The temperature and the time
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