Photosynthesis Ia Essay

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Rigsby Stevenson February 16, 2013 SL Biology Photosynthesis IA (Design Outline) Design: My IA is designed to be able to observe the effects on the rate of photosynthesis in a plant through the variation of light intensity. The elodea plant was chosen as the plant to experiment on and measured its rate of photosynthesis. This was carried out by counting the bubbles that it produced in a certain amount of time (1 minute, with 15 second intervals). The more bubbles it produced in the allotted time, the faster the rate of photosynthesis. Introduction: Photosynthesis is one of the most important processes for organisms to live, and it is a process that essentially absorbs light energy from the sun and turns it into chemical energy. Sunlight 6 CO2 + 6 H2O C6H12O6 + 6 O2 Carbon Water Glucose oxygen Dioxide Question: How does light intensity play a role in affecting the rate of photosynthesis in Elodea plants? Aim: The aim of my experiment is to see how much of a role light takes in the process of photosynthesis. In the sense of what sort of spectrum there is in terms of the ability of the Elodea plant to continue to photosynthesize with “too little” or “too much” light. I will do this by counting the number of bubbles that are released, as they are a product of the process of photosynthesis. Hypothesis: I believe that too little light wont be enough for photosynthesis and too much might cause the plant to overheat or some for of “shutting down”. IV: The light intensities, done by putting the light source at different distances to the elodea plant (12.5 cm, 25 cm, 37.5 cm, 50 cm, 62.5 cm, 70 cm) DV: The DV is the number of bubbles that rise to the top of the test tube. Control: The first trial, where the elodea plant is under the lights in the room with no

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