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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 17 Repeat 1 45 2 0 0 41 10 Repeat 2 47 1 1 0 35 12 Average 47.333333 2.6666666 0.6666666 1.3333333 38.333333 13 As predicted, the results conclude that using sheets with colours near

the red and blue end of the spectrum produce a higher amount of bubbles than

those near green.? Thereby proving that

photosynthesis is increased with certain colours of light.Conclusion/Evaluation? In observation of the results, I have seen how the rate of

photosynthesis in the Elodea has been affected by the various factors.? In reference to the prediction, I was

correct in that the red and blue coloured sheets produced the highest rate of

photosynthesis, whereas the sheets, which were green and yellow, resulted in

the least bubbles.? I feel that we had

taken enough measurements to be sure of a fair test as the experiment was

repeated several times so.? Each plastic

coloured sheet we used had the same time, and variables as the others so we

obtained precise results for every test.?

We did not find anything, which stood out too much from the pattern

except that the red plastic sheet, when used resulted more bubbles generally

than the blue sheet.? This shows that

chlorophyll absorbs red light more easily than blue.? We acquired similar results with each repetition and found ours

to be similar to previous experiments.?

The Elodea produced more bubbles with sheets at each end of the spectrum

because the chlorophyll in the plant absorbs all the colours but transmits

green.? When the light is absorbed the

plant converts it into energy to photosynthesize.? The more light energy it receives the better and faster it can do

this so when the sheets near the blue and red parts of the spectrum are held in

front of the Elodea it absorbs the light and can photosynthesize better.? If plastic sheets are held up which are have

a colour near the green part of the spectrum then the light will be transmitted

and the plant will not be able to photosynthesize as well.? In this experiment we have covered the main

colours of the visible spectrum and they are sufficient to produce the results

that we are looking for. If we were to repeat the experiment then there are several ways we could

improve it.? For example to get around

the problem of the heat from the lamp producing more bubbles then a thick glass

panel could be placed in the middle to prevent any heat reaching the Elodea.? To improve the accuracy of counting the

bubbles, you we could only count the ones, which are a certain size, and only

the ones coming from the very end of the Elodea.? If there were lots of people counting the bubbles and the results

averaged then that would be a more accurate way of obtaining the information necessary.? To extend the investigation you could change

certain variables for example the type of plant that you are using to count the

bubbles from.? You could try an entire

species of plant and see if the results are similar for every type. You could

use different chemicals in the water each time to see which chemicals result in

the greatest rate of photosynthesis.

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