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# Photosynthesis Investigation.

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Introduction

Photosynthesis Investigation Aim: The problem we are trying to solve is the how a variable can affect the rate of photosynthesis, whether it is light intensity, CO2 concentration or the temperature of the water that the pond weed is submerged in. Planning: * Variables: We have 3 main variables: light intensity, CO2 concentration and temperature of water. The light intensity will affect the experiment significantly due to the fact that light energy is needed for photosynthesis to occur. Without light energy there will be no photosynthesis. CO2 concentration will also affect the experiment because a plant takes in carbon dioxide and is the key ingredient for photosynthesis to happen. Temperature of the water will have a slight affect on our results because of the presence of enzymes in plants. Having the temperature too high will kill the enzymes causing them to denature, having the temperature too low and the enzymes will not work at their optimum efficiency. ...read more.

Middle

The temperature is at 20�C because the plant contains enzymes that work at their optimum rate at temperatures up to 25�C. If the temperature is too high the pond weed will die and become 'denatured'. CO2 is need for photosynthesis to occur, which is why changing the CO2 is a good variable. * Method: The apparatus we are going to use to carry out this experiment are: - boiling tube - pond weed - clamp - capillary tube - syringe - Bunsen burner - Light source - Thermometer - NOTE. (All this experiment is carried out on a computer program so the experiment will be already set up.) * Diagrams: * Instructions: The program organises the lay out of the experiment for us so there is no need for any preparation. The only instructions needed are that you must change the variable you want before 'starting' the experiment each time. * Measurements: I will measure the CO2 level and this will also be my variable. ...read more.

Conclusion

Even if we raised the amount of light and CO3 the results still would level off, but quicker and it's possible that the results would level off and read the same reading each time. My prediction was correct and my predicted graph shape was also correct, this concludes my prediction agree with my prediction. * Evaluation: The experiment gave me fairly accurate results overall but again since we were using a computer program we couldn't repeat our results to give us an average. Our results were fairly accurate and reliable, but weren't repeatable. My results were very good because there were no anomalous results which gave us a nice graph. There was no way I could improve the method because it's a computer that we used and there was a fixed way how we could do the experiment, and the only flexibility had were the 3 variables. We could of done at least two more different experiments with the variables that we were given; changing the temperature or changing the light intensity. Both these different experiments would of given us comparatively different results and graphs. ?? ?? ?? ?? 1 ...read more.

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