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 plants absorb light through chlorophyll and chlorophyll absorbs the most violet light and the least green light, then the plants with green light will grow the least and the plants with violet light will increase the most.
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?
We tested our hypothesis by changing the color of the light and measuring how much the plant grew. We repeated it three times with different plants.
Results:
Filter Color
|
Spinach Avg. Height (cm)
|
Radish Avg. Height (cm)
|
Lettuce Avg. Height (cm)
|
Red
|
18
|
13
|
11
|
Orange
|
15
|
8
|
7
|
Green
|
2
|
1
|
3
|
Blue
|
19
|
14
|
13
|
Violet
|
17
|
11
|
9
|
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.
Our data both supported and refuted our hypothesis. It supported our claim the green would grow the least. We found however that instead of violet light causing the most growth, it was blue light that caused the most growth. We also found that spinach grew most and lettuce and radish grew about equally less than spinach.
4. What conclusions can you draw about which color in the visible spectrum causes the most plant growth?
We concluded that blue light causes the most growth in plants. The blue light had the highest plant height in the end of the 30 days. We also found green light caused the least amount growth because all the plants with green light were very short in the end of the 30 days.
5. Given that white light contains all colors of the spectrum, what growth results would you expect under white light?
We would expect that it would grow more than anything else because all colors of the light spectrum are being added up. It would have the effects of all the best lights combined.
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: How does carbon dioxide affect the rate of oxygen produced by the plant?
Hypothesis: If carbon dioxide is essential to photosynthesis and oxygen is a byproduct of photosynthesis, then the more carbon dioxide added to the water, the more oxygen is produced.
Experiment: The variables that remained constant in the experiment were the temperature of the water at 25 degrees, light intensity at power 50, and light color as white. The independent variable in this experiment was the amount of carbon dioxide in the water. The dependent variable was the amount of bubbles produced in 30 seconds. The control is when no carbon dioxide is added. The two levels are no carbon dioxide and half a bottle of carbon dioxide.
No Carbon Dioxide
|
Half Bottle of Carbon Dioxide
| |
Trial 1
|
19
|
33
|
Trial 2
|
19
|
33
|
Trial 3
|
19
|
33
|
Average
|
19
|
33
|
Conclusion:
In this lab, we asked the question of how carbon dioxide affects the amount of oxygen produced by the plant. I found that the more carbon dioxide added to the water, the more oxygen produced by the plant. We measured this in how many bubbles were produced in 30 seconds. We found that on average, the water without carbon dioxide added produced 19 oxygen bubbles in 30 seconds while the water with carbon dioxide produced 33 oxygen bubbles in 30 seconds. This makes sense because photosynthesis requires carbon dioxide and oxygen is a byproduct of photosynthesis. This data supports our claim that the more carbon dioxide added to the water, the more oxygen is produced by the plant.
We did this lab to demonstrate how carbon dioxide affects the production of oxygen in plants. This helped me better understand the process of photosynthesis and what are the products and reactants of photosynthesis. This could be applied to other real world situations such as having an ideal amount of carbon dioxide in a greenhouse.
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