Bromthymol blue is used as an indicator for the presence of CO2 in solution. Label 4 screw cap tubes 1, 2, 3 and 4 with a marker and line them up in order in a test tube rack. This lab involves the qualitative measurement of the changes in carbon dioxide concentration associated with respiration and photosynthesis in the freshwater plant Elodea. This experiment will look at the affect of light intensity on the rate of photosynthesis on Elodea plants. 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). In this experiment, the light intensity is changed by changing the distance of the source of light closer or further away from the elodea, so theoretically, when the intensity becomes stronger due to the light source being closer to the Elodea, the rate of photosynthesis should increase and therefore the number of oxygen bubbles will increase too. Egeria densa, also known as Elodea densa because of its previously incorrect classification in the Elodea genus, is the most popular aquatic plant used to teach photosynthesis in the classroom. Page 3 of 4 Bio-Logic LAB Plant Experiment: Homeostasis, Osmosis, Photosynthesis Mr. Galloway www.soulcare.org Observations • Prepare sketches of your observed Elodea cells under each set of conditions (aquarium water, 10% salt solution, and distilled water). Demonstrate that environmental CO2 is used during photosynthesis in Elodea. 3. Photosynthesis Lab - Elodea & Bromothymol Blue Period _____ Date _____ Background: In this lab, you will investigate the process of photosynthesis. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Jackson, Malcolm Elodea Lab Experiment Report TA: Jessica April 14, 2015. Before they begin the experiment, however, students must come up with a well-worded hypothesis to be … Introduction: In this report you will develop an understanding about what elodea is and the role the abiotic factors of the environment (sunlight, pH, and the deoxidized water) play in changing the biotic factors of elodea, effecting: growth, color, and node development. Obtain 3 pieces of Elodea about 6 cm in length and 2 pieces of aluminum foil. A Jar of Plant Life: The Elodea Experiment. The rate of photosynthesis is determined by the number of bubbles formed by the Elodea plants. Elodea High School Inquiry/Scientific Method Plants. ©2008 CIBT Photosynthesis and Respiration in Elodea – Student Section Page 2 Purpose: Your lab group is asked to design, execute, and analyze an experiment that tries to accomplish the following two tasks: Task A. Light's colour is determined by its wavelength of light, and thus it is possible to devise an experiment to determine which wavelengths of light are most productive for photosynthesis than others. In this experiment I use a plant called Elodea (pond weed). Originally from Brazil, E. densa has spread to temperate regions on all of the continents except Antarctica. In order to do this, you will use an . 2. Start studying Elodea and Photosynthesis Lab. More specifically, you will learn how the amount of light affects photosynthesis. Lesson organisation The work could be carried out individually or in groups of up to 3 students (counter, timekeeper and scribe). The rate of photosynthesis varies greatly with changes in wavelengths of light. 91 Exercise 1 – Observing Photosynthesis via CO 2 Consumption 1. They use this technique to compare the amounts of photosynthesis that occur under conditions of low and high light levels. 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