Investigation into the factors that affect the rate of photosynthesis in Elodea

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... ime to ensure it was fair test for example: The lamp stayed the same distance from the beaker, we used the same plant each time and the plastic sheets were all the same size. The experiment was repeated three times and the results were averaged to ensure they were regular and as expected. Results were recorded each time and patterns observed. Previous results for an experiment of this kind have been recognized and compared. Throughout the experiment we made observations for a number of distinctive things:

· Increase/Decrease in bubbles · Temperature Increase/Decrease

· Change in Elodea

· Size of bubbles

Variables include:

· Length of Elodea

· Amount of water

· Distance of lamp

· Size of boiling tube

· Transparency of sheets

· Time spent counting

Changing either of the variables would have had effects on the end results; we kept ours all the same each time to ensure a fair test.

Results

Coloured sheet Red Orange Yellow Green Blue White

No. of bubbles

50

5

1

4

39

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