Lab 8: Determining the Rate of Photosynthesis in a Leaf. A plant is shown in a beaker and test tube which bubbles to indicate the rate of photosynthesis. The 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. Fill in the table below with the results from your first experiment. Answer the lab question – What factors affect the rate of photosynthesis in plants? In Volume For 5 Minutes Is 0.4 ML For Example, If The Volume At 5 Minutes Is 4 ML. Fill In The Table Below With The Results From Your First Experiment. 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 rate that the disks sink is an indirect measure of the rate of cellular respiration. 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 Compare experimental results to control groups! 1985. elodea 2. Calculate the change in volume by subtracting the later gas volume from the earlier gas volume. Learn vocabulary, terms, and more with flashcards, games, and other study tools. In this virtual photosynthesis lab, students can manipulate the light intensity, light color, and distance from the light source. Steucek, Guy L. Robert J. Hill and Class/Summer 1982. Calculate the change in volume for each measurement time. Experiment 3: Measuring the Rate of Photosynthesis with Floating Leaf Discs. 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? Start studying Photosynthesis lab. Photosynthesis I: An Assay Utilizing Leaf Disks. Write a detailed conclusion based on your results. Present your results in a graph. Materials: Sodium bicarbonate (Baking soda) Did the rate of photosynthesis increase or decrease due to the independent variable? Background Information: Chloroplasts are located in the cells in the center of a leaf, called the mesophyll, or “middle tissue”. 4. Photosynthesis SHORT ANSWER Experiment 1: Measuring the Rate of Photosynthesis Lab Results 1. 5. El Odea Branch 2. ... Like all enzyme-driven reactions the rate of photosynthesis can be measured by either. What was the name of the plant you used to study photosynthesis? “The data show …” a. They compare the rate of net photosynthesis in water vs. a … Print and Web Resources: ! 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. the rate of photosynthesis minus the rate of cellular respiration). Be sure to clearly indicate the x and y axes, the units used, and the graph title(s). Students can measure the rate over time. Can you think of a way to how you might measure the gross rate of photosynthesis with this technique? The FLDA actually measures the rate of photosynthetic oxygen production minus the rate of respiratory oxygen use during the same period. What Was The Name Of The Plant You Used To Study Photosynthesis? Question: Photosynthesis SHORT ANSWER Experiment 1: Measuring The Rate Of Photosynthesis Lab Results 1. “The hypothesis was…” a. 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. 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