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Photosynthesis produces energy in the form of glucose it uses water from the soil, carbon dioxide from the air, and energy from the suns light.

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Julius Atuona Modular Science Photosynthesis Coursework Photosynthesis produces energy in the form of glucose it uses water from the soil, carbon dioxide from the air, and energy from the suns light. Photosynthesis takes place in all plants that contain chlorophyll. Photosynthesis mainly takes place in the palisade mesophyll cell in the leaves of plants. The main reaction is to produce oxygen and glucose, glucose is stored in the form of starch and does not affect osmosis, taking place in the plant. As plants respire both night and day this starch is often used up during the night when photosynthesis cannot take place. The uses of glucose within the plant are for active transpiration, cell division, the production of protein and the production of cellulose. In photosynthesis the raw materials are carbon dioxide and water. They react to form the same products of the reaction of oxygen and starch (glucose that has been stored). The reactions need energy and this comes from light. The green chloroplasts allow light to be used as energy and therefore both of these things are like helpers in the reaction. ...read more.


We will use Canadian pondweed. By counting these bubbles we can tell how fast oxygen is being given off from the photosynthesis. We will place the Elodea in a beaker along with warm water and a bit of Sodium Hydrogen Carbonate (NaHCO3). If it wasn't there then another limiting factor may be the cause of the rate changing instead of just light. By placing the beaker next to a lamp we can change the light intensity. The weed will be given a set number of minutes each time to adjust to the new level of light intensity. The rate of reaction will be in number of bubbles per minute (b.p.m). Constant and Variable factors The factor that will be changed is light intensity. The factors that will be kept constant are the amount of water the weed is put in, carbon dioxide levels, lamp that is used and temperature. I think that as the light intensity is increased the rate of photosynthesis will also increase. ...read more.


It does prove however that as light intensity is increased the rate of photosynthesis is increased also. This is because the more light there is available the more light the chloroplasts can absorb. They use this light in the reaction as energy; therefore the more energy there is available the faster the reaction can take place. Evaluation On the graph there wasn't a point where the rate started to level off. Many things can explain these results, among others. We did not attempt to adjust the temperature as well as we could have done which is a limiting factor of photosynthesis. Also the size of the pieces of Elodea were not all the same so some people may have achieved different results depending on the size of their Elodea and therefore how much surface area was available for photosynthesis to take place in the palisade mesophyll cells. As the burette fills with the gas, water is displaced and the level drops. I think that overall our evidence is very reliable and that our results show what I thought they would. ...read more.

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