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Photosynthesis Virtual Lab

Site 1: Glencoe Photosynthesis Lab

"Which colors of the light spectrum are most important for plant growth?"

Site: bit.ly/pholab

(you can type "glencoe photosynthesis" into a google search to find this resource)

- Read the summary in the side bar which explains how colors of light affect plant growth.

- Read the procedure. Many of your tasks will be recorded in the journal which you will turn in - there are 5 questions to answer in the journal, use complete, thoughtful sentences for each of these questions.

- You will also record your measurements in the table.

Site 2: Photolab

 (search for "kscience photolab")

This simulation allows you to manipulate many variables. You already observed how light colors will affect the growth of a plant, in this simulation you can directly measure the rate of photosynthesis by counting the number of bubbles of oxygen that are released.

There are 3 other potential variables you could test with this simulation: amount of carbon dioxide, light intensity, and temperature. Keep the light settings at white light (you already tested colored light in the last experiment.)

Choose one variable and design and experiment that would test how this factor affects the rate of photosynthesis. Remember, that when designing an experiment, you need to keep all variables constant except the one you are testing. Collect data and write a summary of your findings that includes:

• Hypothesis or Experimental Question

• Data table

• Conclusions

Journal Questions for Site 1

1. Make a hypothesis about which color in the visible spectrum causes the most plant growth and which color in the visible spectrum causes the least plant growth?

 

 

2. How did you test your hypothesis? Which variables did you control in your experiment and which variable did you change in order to compare your growth results?

 

 

3. Analyze the results of your experiment. Did your data support your hypothesis? Explain. If you conducted tests with more than one type of seed, explain any differences or similarities you found among types of seeds.

 

 

 

4. What conclusions can you draw about which color in the visible spectrum causes the most plant growth?

 

 

 

5. Given that white light contains all colors of the spectrum, what growth results would you expect under white light?

 

 

 

Data Table

[pic]

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