simple. A variable that is hard to control is the effect of temperature as the lights used may heat the water. after , say four weeks, carefully take samples of both water and test for purity acid content (ph test) and other tests. fill the other with distilled water and disturb this one everyday (to avoid any chance of fungal or algal grwoth). Algae - Algae - Photosynthesis and light-absorbing pigments: Photosynthesis is the process by which light energy is converted to chemical energy whereby carbon dioxide and water are converted into organic molecules. In this experiment we used a Sodium Bicarbonate to provide the Carbon Dioxide to the Calvin Cycle and tested the rate at which photosynthesis occurred by recording the times at which leaf pieces rose to the surface of a cup of water. Students learn a simple technique for quantifying the amount of photosynthesis that occurs in a given period of time, using a common water plant (Elodea). This teaching resource introduces Cabomba, a pondweed which is much more effective than the traditional Elodea. Maintain the room temperature at 20°C. In photosynthesis, plants use energy from the sun, water, and carbon dioxide (CO 2) from the air to store carbon and energy in the form of glucose molecules. The process occurs in almost all algae, and in fact much of what is known about photosynthesis was first discovered by studying the green alga Chlorella. They use this technique to compare the amounts of photosynthesis that occur under conditions of low and high light levels. Place the tube in a beaker of fresh water. It is a series of complex biochemical reactions and occurs in higher plants, algae, some bacteria and some photoautotrophs. Another assumption is that all the bubbles are the same size. This way, aquatic plants undergo photosynthesis under water. Place excess sodium bicarbonate (NaHCO3) in the water to give a constant saturated solution of CO2. Oxygen gas (O 2) is a byproduct of this reaction. The products of photosynthesis in aquatic plants, basically carbohydrate and oxygen, are used by other organisms living in the same biotic community. take two large plastic tubs (opaque) fill one with pond water and add algal growth (use fast growing alga). The reason why we are using baking soda and powder is because those 2 materials are the resulting chemical reaction to produce bubbles of carbon dioxide to expand under temperature. Demonstrating oxygen formation during photosynthesis can be a tricky process. And just like animals, plants do require oxygen, but in small amounts. One common way is to gather bubbles of gas given off by an aquatic plant. Place a pond weed Elodea upside in a test tube containing water at 25°C. 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