Student Exploration: Photosynthesis LabVocabulary:Prior Knowledge Questions
carbon dioxide, chlorophyll, glucose, limiting factor, nanometer, photosynthesis, wavelength
(Do these BEFORE using the Gizmo.)
- To survive, what gas do we need to breathe in? ___________________________________
- Where is this gas produced? __________________________________________________
During photosynthesis, plants use the energy of light to produce glucose (C6H12O6) from carbon dioxide (CO2), and water (H2O). Glucose is a simple sugar that plants use for energy and as a building block for larger molecules.
A by-product of photosynthesis is oxygen. Plants use some of the oxygen they produce, but most of it is released. In the Photosynthesis Lab Gizmo, you can monitor the rate of photosynthesis by measuring oxygen production.
- Observe the left pane closely. What do you think the bubbles are? ____________________
- Select the BAR CHART tab. On the graph, notice the Oxygen production bar. Move the Light intensity slider back and forth. How does light intensity affect oxygen production?
- Experiment with the vertical Temperature slider (upper left) and the CO2 level slider.
- How does temperature affect oxygen production? ___________________________
- How does CO2 level affect oxygen production? ______________________________
- How does oxygen production relate to the rate of photosynthesis?
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