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The impact of external factors: water and the carbon dioxide on the rate of photosynthesis.

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Internal Assessment - Planning The impact of external factors: water and the carbon dioxide on the rate of photosynthesis. 1. Research question Due to the fact that most plants have no appropriate apparatus to ingest and digest food, they have to obtain it by themselves using simple ingredients. That is why plants are called autotrophs or simply "self - feeders". The process of converting carbon dioxide taken from air and water from the soil into complex substances like glucose, is called photosynthesis and can be presented by the equation: 6CO2 + 12H2O ? C6H12O6 + 6O2 + 6 H2O carbon dioxide + water ? glucose + oxygen + water Oxygen, as a waste product, is released to the atmosphere. Photosynthesis demands also a free energy taken from the sunlight that falls on the plant. ...read more.


Also the temperature should not be forgotten however this factor has not a significant influence on the whole process of photosynthesis (10-18 �C). My target is to consider whether the concentration of carbon dioxide and the light intensity have an impact on the course of photosynthesis in an aquatic plant Elodea Canadensis. My researches will be done with use of the mineral, soda and tap water. Those three will be exposed to the sun light but to check the relationship fully, it is necessary to keep another sample separated - with a mineral water. 2. Hypothesis My predictions will be as follows: First of all, the rate of photosynthesis will be the fastest in a tube with a soda water exposed to the sun light due to the fact that content of the carbon dioxide is higher than in the rest of samples. ...read more.


4. Apparatus I have used: * 4 parts of the plant Elodea (of the same size - 5 cm length) * 4 tubes (of the same size - 15 cm high, and a diameter 1,6 cm) * 4 beakers (of the same size - 7 cm height, diameter 5cm) * 140 ml of tap water * 70 ml of mineral water * 70 ml of soda water * a ruler * a digital stop-watch 5. Methods for the control of variables and collection sufficient relevant data * To obtain results of the influence on the rate of photosynthesis I will observed by a naked eye produced bubbles * The phenomena of producing bubbles will be checked two times after 10 and after 20 minutes of the experiment (those intervals will be controlled with use of a digital stop-watch with an error equals to 0,4 seconds) * The size of an Elodea plant will be checked with a ruler (with an error equals to 1mm) ...read more.

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