Data Sheet: Activity – Photosynthesis and Respiration
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| Name | Course | Date |
| Bio-103 | 10/20/2022 |
Activity Data Code
Procedure I – Net Photosynthesis Rates – 100% Illumination
Complete the tables below using your data and information found under the Background tab (see the Summary of Needed Formulas section)
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TableTop Science – All Rights Reserved
| Leaf
Sample Type |
Illumination
Level |
Oxygen
Concentration Change Data (ppm) |
Elapsed
Time (s) |
Oxygen
Change Rate (ppm/s) |
| Sun-
Adapted |
100% | 19.78 | 40 | |
| Shade-Adapted | 100% | 12.00 | 40 |
| Leaf
Sample Type |
Illumination
Level |
Carbon Dioxide
Concentration Change Data (ppm) |
Elapsed
Time (s) |
Carbon Dioxide
Change Rate (ppm/s) |
| Sun-
Adapted |
100% | -19.78 | 40 | |
| Shade-Adapted | 100% | -12.00 | 40 |
Observations and Questions
[1] How is chlorophyll involved during photosynthesis?
[2] What are enzymes? What role do they play in biological and chemical reactions?
[3] How might differences in enzyme concentrations affect rates of photosynthesis and respiration?
[4] Show your oxygen change rate calculation for the Sun-Adapted data run.
[5] Show your carbon dioxide change rate calculation for the Shade-Adapted data run.
[6] Review the chemical reaction for photosynthesis and then carefully examine your results from Procedure I. Do your results support the relationship between oxygen and carbon dioxide shown in the chemical reaction? Explain. Cite your results as part of your explanation.
[7] Using your results for change in oxygen concentration as a reference, discuss whether your results from Procedure I confirm research findings about differences in the amount of chlorophyll production for sun-adapted and shade-adapted leaves.
[8] What is the difference between photosynthesis rate and net photosynthesis rate? Which rate are you determining in this procedure? Explain.
[9] Explain why (or why not) you would expect respiration to occur when the illumination is 100%?
