I worked out an average for each distance on my results so it made them much more reliable, my averages are in the table below.
Distance of lamp from pondweed (cm) Average amount of bubbles given off for each distance (rounded to the nearest whole number)
As you can see from my table, my results are very varied because in my prediction I said that the closer the light to the pondweed the more oxygen bubbles would be given off but in my results it goes against my prediction. As 20cm away gave off the most oxygen bubbles, 40cm away gave off second highest amount of air bubbles followed by 10cm away and then 30cm and in last place as I predicted it was 50cm, the only result that went with my prediction was 50cm away from the pondweed. In my experiment there wasn't actually any trends or patterns, the results were not the same as I predicted and there is no clear pattern or trend that has occurred to me. As you can see above I have made an extra table for making an average for each distance, I did this so it would make my test more reliable and accurate and therefore place them in an order for me to see which gave off the most oxygen bubbles and so on. The scientific knowledge that I knew before this experiment was that plants need light to carry out photosynthesis and produce bubbles of oxygen gas, but if light is limiting, then the rate of photosynthesis is also limiting which allows the rate of bubbles to slow down and the less oxygen bubbles is produced but unfortunately my results did not show this as I hadfirst expected. Maybe my results were so varied because we did not have the exactly the same amount of carbon dioxide in each test but this would be down to not having top range equipment to make sure the amount of carbon dioxide stays exactly the same.

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