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As photosynthesis proceeds oxygen is released into the interior of the leaf which changes the buoyancy--causing the disks to rise. “The data show …” a. Did the rate of photosynthesis increase or decrease due to the independent variable? ... Like all enzyme-driven reactions the rate of photosynthesis can be measured by either. El Odea Branch 2. Experiment 1: Measuring the Rate of Photosynthesis For the first experiment, what was the change in volume from 00:01:30 to 00:02:00? Background Information: Chloroplasts are located in the cells in the center of a leaf, called the mesophyll, or “middle tissue”. What Was The Name Of The Plant You Used To Study Photosynthesis? Measuring the Rate of Photosynthesis; In this section, students learn how to use the floating leaf disk method to measure the rate of net photosynthesis (i.e. In Volume For 5 Minutes Is 0.4 ML For Example, If The Volume At 5 Minutes Is 4 ML. Write a detailed conclusion based on your results. Photosynthesis I: An Assay Utilizing Leaf Disks. Since cellular respiration is taking place at the same time, consuming oxygen, the rate that the disks rise is an indirect measurement of the net rate of photosynthesis. “The hypothesis was…” a. Purpose: The purpose of this investigation is to measure the rate of photosynthesis in spinach leaves by measuring the length of time it takes for leaf discs to generate enough oxygen to float. Calculate the change in volume by subtracting the later gas volume from the earlier gas volume. The FLDA actually measures the rate of photosynthetic oxygen production minus the rate of respiratory oxygen use during the same period. The Be sure to clearly indicate the x and y axes, the units used, and the graph title(s). Floating C3 Spinach Discs Lab Concerning Photosynthesis that Determined how Light Intensity Affects the Net Rate of Photosynthesis By Senegar & Mitchell and written by Sandra Monreal Abstract Researchers realize that spinach discs float normally so when infiltrating these discs 5. Fill In The Table Below With The Results From Your First Experiment. Calculate the change in volume for each measurement time. Start studying Photosynthesis lab. the rate of photosynthesis minus the rate of cellular respiration). Steucek, Guy L. Robert J. Hill and Class/Summer 1982. Post-Lab Questions. Question: Photosynthesis SHORT ANSWER Experiment 1: Measuring The Rate Of Photosynthesis Lab Results 1. elodea 2. b. One problem in measuring a rate of photosynthesis is that there is a competing process occurring at the same time, cellular respiration, a process that uses oxygen. 3. The rate that the disks sink is an indirect measure of the rate of cellular respiration. In this virtual photosynthesis lab, students can manipulate the light intensity, light color, and distance from the light source. 4. Students can measure the rate over time. Lab 8: Determining the Rate of Photosynthesis in a Leaf. Present your results in a graph. A plant is shown in a beaker and test tube which bubbles to indicate the rate of photosynthesis. They compare the rate of net photosynthesis in water vs. a … Compare experimental results to control groups! Include a brief statement describing why you selected the graphing method you did. Print and Web Resources: ! 1985. Learn vocabulary, terms, and more with flashcards, games, and other study tools. What was the name of the plant you used to study photosynthesis? Experiment 3: Measuring the Rate of Photosynthesis with Floating Leaf Discs. Fill in the table below with the results from your first experiment. Photosynthesis SHORT ANSWER Experiment 1: Measuring the Rate of Photosynthesis Lab Results 1. 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