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Investigating Gas Production By a Green Plant During Photosynthesis.

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INVESTIGATING GAS PRODUCTION BY A GREEN PLANT DURING PHOTOSYNTHESIS INTRODUCTION: To investigate gas production by a green plant during photosynthesis. Photosynthesis occurs only in the presence of light, it takes place in the chloroplasts of green plant cells. Photosynthesis can be defined as the production of simple sugars from carbon dioxide and water causing the release of sugar and oxygen. The chemical equation for photosynthesis can be expressed as: AIM: I am going to investigate how varying light intensity will affect gas production by a green plant during photosynthesis in a plant. To do this I will need to cut a piece of Canadian pondweed and place it into a beaker containing a little bit of sodium hydrogen carbonate. A lamp will be shined onto the pondweed and the amount of bubbles released from the plant will be counted. The lamp will be adjusted to different distances from the plant to try and get different results. FACTORS WHICH AFFECT THIS REACTION ARE: * Light Intensity * Carbon Dioxide * Water * Temperature LIGHT INTENSITY: Pigments in the leaf such as chlorophyll take in light. Chlorophyll absorbs all different coloured types of light, it absorbs blue light, and also easily absorbs red light, and however, chlorophyll does not absorb green light or yellow light effectively. But it tends to reflect them, which decreases the amount of light absorbed, and therefore the rate of photosynthesis. ...read more.


Light energy travels along the circumference of an expanding circle. When light energy is released from a point, the energy is dispersed equally along the circumference. APPARATUS: * A beaker * Cold water * Measuring cylinder * Canadian Pondweed * Knife * White tile * Stop watch / Clock * A meter ruler * Bench lamp * A beaker containing sodium hydrogen carbonate * Scalpel * Scissors DIAGRAM: FAIRNESS: To ensure the experiment is done fairly the following things must be done. The pondweed must be used every time we change the light distance. I will repeat the experiment 5 times for accuracy. There should be only be one variable that I investigate and that is the light intensity. Take the results after every 2 minutes. I also need to use the same lamp when I repeat the experiment so that the intensity of light does not vary. SAFETY: To ensure that the experiment goes safely I have to do the following things. I will need to wash my hands after handling the pondweed for hygiene. Also make sure there are no water spillages on the floor on near the lamp, as this can cause an electric shock. When handling the scalpel. Always follow the laboratory rules. METHOD: * Collect all the apparatus and set it up. * Cut a steam of Canadian pondweed. ...read more.


This has happened with a slight variation with all the distances. My results and scientific knowledge support my prediction very well. They prove that the factor of light intensity does affect the rate of photosynthesis. My knowledge of photosynthesis also supports my prediction and conclusion. EVALUATION: Overall, I have felt that my experiment did go well, however, I do feel the photosynthesis investigation was probably not performed as accurately as it could have been due to some controllable and uncontrollable conditions. Sometimes the piece of pondweed did not photosynthesise at a steady rate; this could be due to the fact that the pondweed was not cut accurately. Also, the measuring of distances between the measuring cylinder with the pondweed in it and the lamp could have been a bit inaccurate and could have been measured properly this could have been a major negative point to my results. The spreading of sodium hydrogen carbonate in the measuring cylinder could have been inaccurate that's why my results could have varied. However, I do feel my time keeping was good; I was and tried to be as accurate as possible with this. I could have improved my investigation by cutting the pondweed properly and measuring the distances between the measuring cylinder and the lamp could have been a bit more accurate. To plot my results for the average graphs I did have to round the numbers up to an integer they may have become less accurate, apart from that I feel I plotted my results as best as I could. ...read more.

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