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The Effect of light Intensity on Photosynthesis

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The Effect of light Intensity on Photosynthesis Of Elodea Canadensis Introduction I wanted to find out how much the light intensity affected the Photosynthesis in Elodea Camadensa. I decided to do this by measuring the amount of oxygen created during photosynthesis. Photosynthesis is the procedure all plants go through to make food. This process uses Carbon dioxide, water and light energy. It produces Oxygen and Glucose. Carbon dioxide + water Light Energy glucose + oxygen Chlorophyll 6CO2 + 6H20 Light Energy C6 H12 O6 + 6O 2 Chlorophyll Photosynthesis occurs in the leaves of the plant in the palisade layer. Chlorophyll in the cells in the palisade layer absorb light for photosynthesis. The plant releases the oxygen created in photosynthesis back into the air but it uses or stores the glucose for energy, respiration, growth and repair. The leaves and plants are also specially adapted for photosynthesis in their structure and cell alignment. Preliminary Experiment Apparatus * Piece of Elodea Canadensis * Bulb * Voltmeter * Test tube * Beaker * Box * Two electrical wires * Stopwatch * Thermometer Method I put a piece of Elodea Canadensis (pond weed) ...read more.


I believe my prediction to be correct as plants need sunlight to photosynthesise. So if the light intensity increases so should the rate of photosynthesis. If you look at a plants leaves surface area and position on the stem you see that it is trying to get more light. This shows us that the more light a plant gets the more it will photosynthesise this all depends on the limiting factors. I will vary the light intensity in the experiment. But I will control the amount of water and temperature so that they are always the same. Apparatus * Beaker * Test tube * Piece of Elodea Canadensis * Water * Voltmeter * Capillary tube * Bulb * Syringe * Two electrical wires * Box * Clamp stand I will, for safety reasons, keep all water away from the electrical equipment and the bulb. Method I will place the piece of Elodea Canadensis and place it in the syringe. Attach the capillary tube to the end of the syringe and fill with water. Place the syringe in a clamp stand and place the end of the capillary tube in an empty beaker, this will then be placed in the cardboard box. ...read more.


Both these experiments tell us how much oxygen is produced during photosynthesis by using similar but different methods. Both experiments came up with valuable results even though neither where completely accurate. The improved experiment results showed a wider range of volts and accuracy therefore being the more reliable source of results. I think that there must be a more reliable way of doing these experiments but with the equipment and time we had I believe that this was the most accurate and reliable way of doing these experiments. If I was to perform a third experiment which was yet again improved I would test a larger range of volts and find a more reliable way of doing the experiment on a whole. We have proved that oxygen is a product of photosynthesis and recorded reasonable results showing the amount of oxygen produced. I have also included graphs using the information in the tables. These show the rate that oxygen was produced (rate of photosynthesis). I think that this experiment was a good investigation into photosynthesis and shows us about production rate of oxygen. ?? ?? ?? ?? Emma Northcote-Smith ...read more.

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