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Photosynthesis Investigation

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Experiment To find out if the intensity (brightness) of light will have an effect on the rate of photosynthesis in green pond weed called ELODEA Research on photosynthesis Photosynthesis is processes by chlorophyll (green in the leaf).The three things that is needed in photosynthesis are sunlight from the sun, energy form the roots coming form the soil nitrate and carbon dioxide. Photosynthesis takes place in the chloroplast cells where it contains chlorophyll and other things. Bacteria comes from the sunlight which then turns into chemical energy. What happens is Carbon dioxide + water +light energy glucose + oxygen Glucose is some kind of sugar. The three things that affect photosynthesis is when the temperature gets lower, amount of carbon dioxide and if the light is kept away from the plant. Diagram A bulb water Apparatus Pond weed called Elodea 60 watt bulb with a holder Cold water form the school pond A ruler A stop watch Boiling Making the experiment a fair test: The way I'm going to make the experiment a fair test is by using the same pond weed and just altering the distance from the bulb and the test tube , the disadvantage of using them same pond weed is that the weed ...read more.


the graph.When I did the first experiment without the sun the maximum oxygen being produce was only 7 bubbles of oxygen in five minutes. The further you put the light away from the weed the smaller the bubbles of oxygen comings out. When I did the experiment again but with a bulb the results rose and at a distance of the 10cm away from the weed the results increase dramatically and the amount of oxygen for five minutes was about 52.5 of bubbles of oxygen got produced and then for the distance of 2cm away from the weed, these results where even higher for five minutes and it was 70 bubble where produced in this distance. By looking at all these results they are telling me that the longer the distance away from the bulb and weed the longer it takes to produce bubbles and the shorter the distances is from the weed, the more amount of bubbles of oxygen are produced. The reason for that occur is the more light energy is shined on the leaves the faster the photosynthesis processes and by adjusting the distance it effects the photo process in some way. ...read more.


Another reason why the experiment didn't go so well was because was the temperature of the bulb changed the process of photosynthesis when got close, meaning when the bulb was 20 cm way from the weed that temperature of the weed wasn't the same has when its 2 cm way from each other, see at 20cm most of the light is just being wasted and not going to the weed and at 2cm almost all of the light is going to the weed. The things I would have improve on the experiment is I would place the pond weed in a glass box and a light in there to, this method would have to give me very accurate results, go thing of using glass is that you could see and count the bubbles. Another thing I would change is I would change the weed every time when doing a new distance because the weed would be losing it's wealth, but the disadvantage is that by using a new leaf the bubbles of oxygen wouldn't be the same. Use different watt bulbs and what effects do they make or a light and a power pack to control the brightness of the bulb. ...read more.

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