For this experiment, we are using waterweed (Elodea) to support our experiment because Elodea is an aquatic plant that needs water to grow. This way, aquatic plants undergo photosynthesis under water. They use this technique to compare the amounts of photosynthesis that occur under conditions of low and high light levels. One common way is to gather bubbles of gas given off by an aquatic plant. take two large plastic tubs (opaque) fill one with pond water and add algal growth (use fast growing alga). 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). simple. 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. 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. Place the tube in a beaker of fresh water. Place excess sodium bicarbonate (NaHCO3) in the water to give a constant saturated solution of CO2. 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. Place the lamp (the only light source) at a fixed distance from the plant. This teaching resource introduces Cabomba, a pondweed which is much more effective than the traditional Elodea. 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. Maintain the room temperature at 20°C. A variable that is hard to control is the effect of temperature as the lights used may heat the water. Nearly every life … Place a pond weed Elodea upside in a test tube containing water at 25°C. after , say four weeks, carefully take samples of both water and test for purity acid content (ph test) and other tests. Demonstrating oxygen formation during photosynthesis can be a tricky process. Oxygen production by photosynthetic organisms explains why … Photosynthesis is an important biochemical pathway involving the production of sugar (glucose) from light, water and carbon dioxide and releasing oxygen. 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. 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. Another assumption is that all the bubbles are the same size. Before they begin the experiment, however, students must come up with a well-worded hypothesis to be … And just like animals, plants do require oxygen, but in small amounts. It is a series of complex biochemical reactions and occurs in higher plants, algae, some bacteria and some photoautotrophs. Experiment. 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