To survive, what gas do we need to breathe in? Oxygen
Where is this gas produced? Plants
Gizmo Warm-up
During photosynthesis, plants use the energy of light to
produce glucose (C6H12O6) from carbon dioxide (CO2),
...
To survive, what gas do we need to breathe in? Oxygen
Where is this gas produced? Plants
Gizmo Warm-up
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.
1. Observe the left pane closely. What do you think the bubbles are? Oxygen being produced
2. 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?
The less light there is the less oxygen is produced, but the more light there is the more
oxygen is produced.
3. Experiment with the vertical Temperature slider (upper left) and the horizontal CO2 slider.
A. How does temperature affect oxygen production? If it’s too cold no oxygen is
produced, if it’s too hot no oxygen is produced as well, it has to be in the middle.
B. How does CO2 level affect oxygen production? The less CO2 the less oxygen is
made, but the more there is the more oxygen is made.
C. How does oxygen production relate to the rate of photosynthesis? You need the
perfect temp and environment to create oxygen just like with photosynthesis, so if
oxygen is slowed down the photosynthesis slows down.
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