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My aim in this experiment is to find out if the amount of light given to a plant affects the amount of oxygen given of in the process of photosynthesis.

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Introduction

Photosynthesis Aim My aim in this experiment is to find out if the amount of light given to a plant affects the amount of oxygen given of in the process of photosynthesis. Prediction I think that the rate of photosynthesis will increase as the light intensity increases. This is because light is a limiting factor of photosynthesis and if increased the rate of photosynthesis will increases as well. Because of limiting factors I expect the graph I create to ploto out at at a certain light intensity. This is because when the light intensity increases the rate of photosynthesis will increases to a point were there is no carbon dioxide in the air for photosynthesis to increase any more. I will also be keeping the temperature of this experiment the same. When the temperature increases the enzymes in the chloroplast will work faster making the process of photosynthesis faster and give of more oxygen but if the temperature I did the experiment at was over 45�C photosynthesis would not be able to take place because the active face of the enzymes would have been denatured. ...read more.

Middle

The controlling factors I will keep the same are temperature at 25�C and the amount of NaHC03 at 5%. It is important I keep theses two controlling factors the same to ensure a fair test. Temperature- It is important I keep temperature the same because it is a controlling factor in this experiment. If I increase the temperature the enzyme in the leaf will work faster producing more oxygen. If the temperature is increased over 45�C the enzymes will denature. NaHCO3- it is important I keep this the same to ensure that the plant has the same amount of carbon dioxide to take in. If not it will not be a fair test. Safety There are no risks in this experiment because it is a computer simulation. Apparatus The apparatus I use in this experiment are: Gas syringe, Capillary tube, Elodea (plant), Lamp, Stop watch. Method I moved the lamp closer to Elodea to increase the light intensity and collect the amount of oxygen collected in the gas syringe. I will do this at 10 different light intensities 10,20,30,40,50,60,70,80,90,100 all these are measured in arbitry units. ...read more.

Conclusion

Evaluation The procedure to obtain results was perfect because it was a computer simulation. If I was to do the experiment I would have recorded each result 3 times and taken an average but because it was a computer simulation it would have been pointless because all the results would have been the same. The results drew a perfect straight-line graph with no anomalous results. The results were good enough to write a conclusion. I expect that the reliability of the results to be reliable because it was a computer simulation and shouldn't be wrong. Further work I would do on this experiment would be to do the exact same experiment again using a less concentration of carbon dioxide so I could see a what point the plant ran out of carbon dioxide and the graph ploto out. I will also do the experiment changing the temperature. I would expect the enzyme to denature and photosynthesis to stop at the temperature 45�C. I would expect the amount of oxygen to increase as the temperature increases. This is because as higher temperatures the enzyme would have more energy and speed up the reaction. Up to the temperature of 45�C. ...read more.

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