Photosynthesis Virtual Labs.
Lab 1: Glencoe Photosynthesis Lab
Analysis Questions
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?
If blue light shines on the plants, then there will be more plant growth. If green light shines on the plant, then there will be less 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?
I tested my hypothesis by putting each type of plant under each color of light to test what the effects were. The control variables in this experiment were the amount of water, soil, and the viability of each seed. The variables I changed in this experiment were the colors of light.
Results:
Filter Color
|
Spinach Avg. Height (cm)
|
Radish Avg. Height (cm)
|
Lettuce Avg. Height (cm)
|
Red
|
18.33
|
13
|
11
|
Orange
|
15
|
8.33
|
6
|
Green
|
3
|
1.66
|
3
|
Blue
|
19
|
14
|
12.5
|
Violet
|
16
|
30
|
8.33
|
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.
My data supported my hypothesis because as I suspected, blue was the color that produced the most plant growth and green was the color that created the least. I conducted tests with 3 different plants, radish, spinach, and lettuce. Across all of them green had the lowest height and blue the tallest. However there were some difference between the plants, for an example the lettuce did not grow as tall as the radish or spinach did.
4. What conclusions can you draw about which color in the visible spectrum causes the most plant growth?
I can conclude that the color green produces the least amount of plant growth, and blue light produces the most.
5. Given that white light contains all colors of the spectrum, what growth results would you expect under white light?
I expect an average of all the colors put together to be the effect of white light on a plant. Since, white light contains all of the colors, it makes sense to me that white light should be not as good as blue but not as bad as green.
Site 2: 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.
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 lab report of your findings that includes:
- Question
- Hypothesis
- Experimental parameters (in other words, what is the dependent variable, independent variable, constants, and control?)
- Data table
- Conclusion (Just 1st and 3rd paragraphs since there's no way to make errors in a virtual lab)
*Type your question, hypothesis, etc. below. When done, submit this document via Canvas. You may also copy and paste it into your blog.
Question: Will increased amounts of carbon dioxide increase the rate of photosynthesis?
Hypothesis: If the level of carbon dioxide surrounding the plant is increased, photosynthesis will take place more rapidly.
Independent Variable: Amount of carbon dioxide
Dependent Variable: Number of bubble produced
Control: Plant
Data Table:
Water
|
Carbon dioxide + water
| |
Amount of bubbles in 1 min.
|
0
|
0
|
Conclusion:
In this lab we asked the question, will an increased amount of carbon dioxide added to the plant’s surroundings make photosynthesis occur more rapidly? Before performing the experiment I thought that it would increase the rate of photosynthesis, however after conducting the experiment I found that an added amount of CO2 does not have any affect on the plant. In one minute without adding any water, the amount of bubbles produced was 0 and with the carbon dioxide, the amount of bubbles was also 0.
This lab was done to demonstrate how changes in a plant’s environment affects how much oxygen it produces. From this lab I learned that even if more carbon is added to the atmosphere (something plants need) it doesn't necessarily mean that the plant will thrive. This lab deepened my understanding of photosynthesis because previous to this lab, I thought more carbon dioxide meant more photosynthesis. Based on my experience from this lab, if I ever decide to grow a garden I know the proper conditions to have a healthy plant.
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