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Investigation into the factors that affect the rate of photosynthesis

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Introduction

Biology Investigation: Investigation into the factors that affect the rate of photosynthesis Photosynthesis: Photosynthesis is the chemical process, which takes place in every green plant to produce food in the form of glucose. Plants use the energy from the sun to make the glucose, which is sent around the plant. Photosynthesis takes place mainly in the leaves with the aid of chlorophyll, which is found in chloroplasts. Leaves have a large surface area to obtain more the most sunlight as possible to photosynthesise. The chemical equation for photosynthesis is: Carbon dioxide + Water = Glucose and Oxygen 6CO2 + 6H20 = C6H1206 + 6O2 I have decided to do a preliminary experiment to help me with my investigation. I have chosen to investigate how light affects the rate of photosynthesis. I will use this information to help me with my main investiagtion into how colours affect the rate of photosynthesis. ...read more.

Middle

13 15 14 30cm 12 8 10 The results of the table will now be shown on a graph for clearer understanding of the pattern. The graph results tell me that the most productive distance is 2cm away from the boiling tube. I predicted this would be the most productive temperature as it is the closest and provides the most heat. To be safe I will keep the lamp 4cm away to stop the water overheating and killing the enzymes. Using this information I can start the initial investigation and find out which colours affect photosynthesis in a pondweed. Aim: How colour affects the rate of photosynthesis Prediction: I predict that the colours yellow, white and green will produce less bubbles because the light will be reflected. The colour red and blue, however, I think will produce more bubbles because the light will be absorbed. Apparatus: > Lamp > Coloured plastic sheets (red, green, blue,white and yellow) ...read more.

Conclusion

Conclusion & Evaluation: I am pleased with the overall experiment, as my prediction was correct. If I were to repeat this experiment I would make sure I repeated the experiment twice to get an average. I was unable to repeat the experiment as I didn't have time but I know they would've made my overall results clearer. To improve the accuracy of the investigation I could only count the bubbles that were of a certain size or only the ones coming from the very end of the plant. Also to extend the investigation I could change certain factors. For example: > The type of plant > The length of the plant > The temperature of the water You could also use different chemicals in the water to see if that affected the rate of photosynthesis. I am pleased with this experiment because I managed to do a preliminary experiment and also I used several colours so I could compare the results. Overall I think the investigation went well although it could be improved in. I also found it quite difficult to keep the investigation fair. Katie Jones 11MAC ...read more.

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