Photosynthesis Lab Report
Determining the Effect of Light Intensity on Photosynthesis
Avalon Pernell, et al
Abstract: The purpose of this lab was to determine how light affected photosynthesis, specifically the production of O2 bubbles. It was predicted that when the light was more intense the O2 bubble production will be high. Conversely, when the light was less intense the O2 bubble production will be lower. Basically the plant that is closer to the light will produce more bubbles than the plant that is placed farther away from the light source. In this lab the independent variable is the light intensity (distance from light source) and the dependent variable is oxygen output (number of bubbles). Since the distance was changed in the lab the control was the plant placed 0.0m away from the light source. After, evenly cutting 10 evergreen sprigs and placing them at the bottom of each test tube, each tray of …show more content…
Since the distance was changed in the lab the control was the plant placed 0.0m away from the light source. The steps used to complete this lab were as follows: begin by filling test tubes with a water/sodium bicarbonate mixture using the pipette and evenly cutting 10 evergreen sprigs. Once this is completed place one evergreen sprig at the bottom of each test tube. Place each test tube rack at their set distance from the light source and wait for 20 minutes. After the 20 minutes has expired proceed to count the bubbles in each test tube and record each group’s data in the data table. Calculate the average number of bubbles and graph accordingly.
Results
At 0.0m the average number of bubbles equaled ≈12. At 0.5m the average number of bubbles was ≈4 with the erroneous data, and ≈13 when using the correct data given by the instructor. The average number of bubbles continued to decrease to ≈12 at 1.0m, ≈9 at 1.5m, and 9 at
Avalon Pernell, et al
Abstract: The purpose of this lab was to determine how light affected photosynthesis, specifically the production of O2 bubbles. It was predicted that when the light was more intense the O2 bubble production will be high. Conversely, when the light was less intense the O2 bubble production will be lower. Basically the plant that is closer to the light will produce more bubbles than the plant that is placed farther away from the light source. In this lab the independent variable is the light intensity (distance from light source) and the dependent variable is oxygen output (number of bubbles). Since the distance was changed in the lab the control was the plant placed 0.0m away from the light source. After, evenly cutting 10 evergreen sprigs and placing them at the bottom of each test tube, each tray of …show more content…
Since the distance was changed in the lab the control was the plant placed 0.0m away from the light source. The steps used to complete this lab were as follows: begin by filling test tubes with a water/sodium bicarbonate mixture using the pipette and evenly cutting 10 evergreen sprigs. Once this is completed place one evergreen sprig at the bottom of each test tube. Place each test tube rack at their set distance from the light source and wait for 20 minutes. After the 20 minutes has expired proceed to count the bubbles in each test tube and record each group’s data in the data table. Calculate the average number of bubbles and graph accordingly.
Results
At 0.0m the average number of bubbles equaled ≈12. At 0.5m the average number of bubbles was ≈4 with the erroneous data, and ≈13 when using the correct data given by the instructor. The average number of bubbles continued to decrease to ≈12 at 1.0m, ≈9 at 1.5m, and 9 at