Global Warming and Carbon Dioxide

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Virtual Lab: Optimizing Photosynthesis

Maria Diaz
March 12,2012

Pre-Lab Questions
1. Which two variables are controlled in a similar manner? The two variables that can be controlled in a similar manner are CO2 & the light level. 2. How can you get the results to the investigation faster? You can get the results to the investigation faster by adjusting the speed at the bottom of the water weed simulation. 3. How will you be able to determine the rate of photosynthesis in this simulation? One can determine the rate of photosynthesis in the simulation by the amount of bubbles in the water weed after the simulation is done. 4. Write the chemical equation for photosynthesis in the space below The chemical equation for photosynthesis is

6CO2 + 6H2O ------> C6H12O6 + 6O2

5. What gases do the bubbles that appear in the simulation represent? The gas bubbles the appear in the simulation represent oxygen bubbles because the water weed takes in carbon dioxide and release oxygen because of photosynthesis. 6. Write a hypothesis for each of the controlled (or independent) variables in this simulation. Be certain to include both a statement of what you would expect the impact to be for each variable on the rate of photosynthesis (the number of bubbles appearing in a set period of time) and the reason it would have this impact.

a. Colour of light:
Plants are green because they reflect green light more than any colour on the colour spectrum, therefore if a plant is only exposed to green light it will reflect more than if it were placed under a red, white, or blue light making photosynthesis less efficient.

b. Level (or intensity) of light:
Photosynthesis is the structure of sugars using carbon dioxide and water. The energy for the process comes from light and a green pigment called chlorophyll allows the plant to transfer the energy from light to sugar. The light intensity determines the growth of the plant as...
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