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How Light Affects Photosynthesis.

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Introduction

Title: How Light Affects Photosynthesis. Aim: My aim was to investigate how light affected photosynthesis. Prediction: My prediction is that the closer the weed is to the light the faster the photosynthesis as light acts as a catalyst which speeds it up. Bibliography: For my work I used the internet and certain science books for info. Hypothesis: Photosynthesis is a process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose. In doing so, photosynthesis provides the basic energy source for virtually all organisms. An extremely important by product of photosynthesis is oxygen, on which most organisms depend. Factors that affect Photosynthesis * Light affects the rate of photosynthesis, it is the main energy source, and this is what we are testing in this investigation. ...read more.

Middle

3. Then I placed a piece of pond weed inside the boiling tube and left it for 1 minute to let it get used to its surroundings. 4. Then I counted the number of oxygen bubbles given off in 1 minute. 5. Then I placed the lamp 10cm away from the boiling tube and counted the number of bubbles given off in 1 minute and done this for extra 10cm each time. 6. Then I repeated the experiment for any mistakes. Results: Distance from lamp Number of oxygen bubbles given off in 1 minute Number of oxygen bubbles given off in 1 minute Average number of oxygen bubbles Experiment 1 Experiment 2 0 4 2 3 10 84 76 80 20 72 64 68 30 63 58 60.5 40 54 46 50 50 50 32 41 60 43 28 35.5 70 35 22 28.5 80 20 18 19 90 4 6 5 100 3 1 2 ...read more.

Conclusion

This could be due to other factors that affect the rate of photosynthesis for example the amount of carbon dioxide in the atmosphere or the temperature. My results agree with my prediction that was; the closer to the light the faster the rate of photosynthesis. My graph is a straight-line graph with a negative correlation. Conclusion: My investigation has shown me that the more the light, the faster the rate of photosynthesis, my results don't show me a definite conclusion because there are more factors that affect the rate of photosynthesis like the amount of carbon dioxide in the atmosphere and the temperature. I could improve my investigation by using a syringe to measure the volume of oxygen given off rather then counting the bubbles because they can be in different sizes. Also I can use others factors that affect the rate of photosynthesis like temperature by having the water at different temperatures and also the concentration of carbon dioxide by controlling how much sodium hydrogen carbonate I put in. ...read more.

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