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Photosynthesis Lab

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Biology Harry Whalley Photosynthesis Lab Photosynthesis is a chemical reaction, which uses the energy of light. It can be measured my the amount of gas is produced. In aquatic plants it coverts the Co2 in the water to oxygen, this then bubbles to the surface. It is possible to measure the amount of bubbles as a rate of photosynthesis. Hypothesis: As Photosynthesis needs light, I predict that as the light intensity goes up the rate of Photosynthesis will also go up, however I am not sure if it is directly proportional. Method: A shoot of Elodea plant was cut at the non-growing end and then put into a boiling tube with the cut end facing upwards. ...read more.


This setup was left for 5 minutes to equibrate. Distance x was set and the number of bubbles released from the plant in 2 minutes was recorded. This was repeated 3 times from each distance to find the average. Results: Distance No. Bubbles Temperature Ave No. Bubbles 316mm 3, 2, 2 20 2.3 182mm 8, 8, 7 21 7.5 129mm 7, 7, 7 21 7 10mm 13, 10 25 11.5 See chart. Other observations, The bubbles coming of the leaf were big. Some bubbles caught on a leaf above it, forming a bigger bubble which when rising to the surface only counted as one. ...read more.


(quite a lot of gas considering the size of the bubble) this is why it would have been more effective to measure the volume of gas escaping my trapping it. Other less important factors may have been a change in other lighting, for example the sun going in. For a more accurate study it should have only been one light source. The amount of CO2 in the water must have decreased as the plant converted it to Oxygen. This may have affected its performance. Conclusion: Light intensity does effect the rate of Photosynthesis in a plant, however I think that the experiment could not quantify this rate because it was too inaccurate and had too many sources of error ...read more.

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