And just like animals, plants do require oxygen, but in small amounts. Place the lamp (the only light source) at a fixed distance from the plant. For this experiment, we are using waterweed (Elodea) to support our experiment because Elodea is an aquatic plant that needs water to grow. This experiment could certainly be done with land plants, but using a water plant makes it easier to have a simple way to measure the rate of photosynthesis--the … 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. Another assumption is that all the bubbles are the same size. Demonstrating oxygen formation during photosynthesis can be a tricky process. They use this technique to compare the amounts of photosynthesis that occur under conditions of low and high light levels. Oxygen gas (O 2) is a byproduct of this reaction. 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. 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). An assumption being made in this experiment is that the gas bubbles being counted are only oxygen, and that production of oxygen is proportional to the rate of photosynthesis. 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. after , say four weeks, carefully take samples of both water and test for purity acid content (ph test) and other tests. Experiment. Nearly every life … Before they begin the experiment, however, students must come up with a well-worded hypothesis to be … This way, aquatic plants undergo photosynthesis under water. 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. This teaching resource introduces Cabomba, a pondweed which is much more effective than the traditional Elodea. Oxygen production by photosynthetic organisms explains why … take two large plastic tubs (opaque) fill one with pond water and add algal growth (use fast growing alga). Maintain the room temperature at 20°C. Place a pond weed Elodea upside in a test tube containing water at 25°C. The products of photosynthesis in aquatic plants, basically carbohydrate and oxygen, are used by other organisms living in the same biotic community. A variable that is hard to control is the effect of temperature as the lights used may heat the water. simple. Place the tube in a beaker of fresh water. fill the other with distilled water and disturb this one everyday (to avoid any chance of fungal or algal grwoth). 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