Photosynthesis Lab Report

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American River College *

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310

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Biology

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Feb 20, 2024

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Photosynthesis Introduction Key Concepts  Photosynthesis consumes CO 2 and produced glucose/starch along with O 2 as a by-product  In addition to CO 2 and H 2 O, photosynthesis requires light and specialized pigments to occur.  Rates of photosynthesis can vary based on environmental conditions. Photosynthesis Simulation Overview Go to this website: https://leosiiman.neocities.org/lab-rate-of-photosynthesis/photolab-individual.html and answer the following questions: 1. What are the three variables? 2. Use on online conversion tool to figure out the Fahrenheit values of 10, 25, and 40 degrees Celsius and report here: 3. Which of these are the independent variable(s) (the variables you can change)? 4. Which of these are the dependent variable(s) (the variables you measure as a result of running the experiment)? Sample Experiment Click on the white arrow to run a sample experiment. 5. Describe what happens:

Photosynthesis 6. What are the bubbles being produced? 7. What does it mean about photosynthesis if more or less bubbles are produced? Experimental Results Run the experiment using the following parameters. For each run, record the number of bubbles at 5 second intervals until 30 seconds. Table 1. Simulation Results with Different Environmental Parameters Number of Bubbles 5 sec 10 sec 15 sec 20 sec 25 sec 30 sec Total Lamp Intensity = 0, Temp = 10 C Lamp Intensity = 1000, Temp = 10 C Lamp Intensity = 2000, Temp = 10 C Lamp Intensity = 3000, Temp = 10 C Lamp Intensity = 0, Temp = 25 C Lamp Intensity = 1000, Temp = 25 C Lamp Intensity = 2000, Temp = 25 C Lamp Intensity = 3000, Temp = 25 C Lamp Intensity = 0, Temp = 40 C Lamp Intensity = 1000, Temp = 40 C

Photosynthesis Number of Bubbles Lamp Intensity = 2000, Temp = 40 C Lamp Intensity = 3000, Temp = 40 C 8. Take a screen shot during one of your experimental runs that shows the date and time of your experiment and insert here: 9. On a separate piece of paper, create two graphs. a. For the first graph, the x-axis will be the four lamp intensities and the y-axis will be the total # bubbles produced. The graph will then have three bars at each lamp intensity representing the results from the three different temperatures. Be sure to label all these parts – a graph should always be able to be understood as a stand a one unit! b. For the second graph, the x-axis will be the three temperatures and the y-axis will be the total # bubbles produced. The graph will then have four bars at each temperature representing the results from the four different light intensities. Sample Bar Graph with three categories and four bars per category c. Take a picture of these graphs and insert here:

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Photosynthesis Post-Lab Questions 10. How does light intensity affect the rate of photosynthesis? Use the data to justify your answer. 11. What is the optimal temperature for photosynthesis? Use the data to justify your answer.

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