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The effect of light intensity on the rate of photosynthesis.

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Introduction

Owen Davies GCSE Coursework The effect of light intensity on the rate of photosynthesis. Plan: Aim: To investigate the affect of light intensity on the rate of photosynthesis. Theory: Before I predict what will happen I must look at how photosynthesis occurs. Photosynthesis is the way plants create a source of food for themselves. Photosynthesis requires the following resources; Carbon Dioxide, Water and light. Inside the leaves of a plant there is a green substance, this substance is known as chlorophyll. Chlorophyll is in the Chloroplast which are cells contained inside a plant. Chlorophyll absorbs sunlight and then makes the energy from the sunlight available for chemical reactions. This shows that Chlorophyll is used to convert light energy to chemical energy. ...read more.

Middle

The sunlight is absorbed from a green pigment in plants called chlorophyll. The chlorophyll is present within the chloroplast of the leaf cells, which the reaction takes place in. Chloroplasts are small green structures found in the cytoplasm of plant cells. Chlorophyll is the substance that gives plants there green colour. It is able to absorb energy from this light. The water molecules are split into hydrogen and oxygen molecules, the oxygen escapes into the atmosphere while the hydrogen is mixed with the carbon dioxide to create sugar. Prediction: I predict that if there is a higher amount of light intensity on the plant the rate of photosynthesis is going to increase due to there being more energy available to be used to create sugar. ...read more.

Conclusion

3. We shall then set the lamp at 20cm then 30 and so on up to 50cm. 4. We shall do it again to make it fair. 5. We shall then record our results. 6. And then plot our graph. Diagram: By Owen Davies Results: Evaluation: During the experiment I found that my prediction was correct in saying that if there is a higher amount of light intensity on the plant the rate of photosynthesis is going to increase, therefore as the light gets further away from the plant a weaker source of energy will be reaching the plant. Conclusion: To make this experiment better I could have done it more times and I could have used a different plant, this would have helped my results and my graph to show my point. I think the experiment worked fine and it proved my prediction and theory was correct. By Owen Davies ...read more.

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