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 are exposed to different colors of light, than the plant exposed to red or blue light will have the most growth, while the plant exposed to green light will grow the least.
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 the hypothesis by exposing the plants to each color of light for 30 days. A variable I controled was the type of plant. I changed the color of light in each test.
Results:
Filter Color
|
Spinach Avg. Height (cm)
|
Radish Avg. Height (cm)
|
Lettuce Avg. Height (cm)
|
Red
|
18.3
|
12.6
|
11
|
Orange
|
14.6
|
8
|
6
|
Green
|
2
|
1.3
|
3
|
Blue
|
19.3
|
14
|
12
|
Violet
|
16.3
|
10.1
|
8
|
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.
The data did support my hypothesis. The plants exposed to red or blue light consistently grew the tallest and the green light plants grew the least in each of the tests. The order of best light to worst light was consistent through all of the plants.
4. What conclusions can you draw about which color in the visible spectrum causes the most plant growth?
I can conclude that the colors blue, red, and violet point to more plant growth, while colors like green lead to poor plant growth.
5. Given that white light contains all colors of the spectrum, what growth results would you expect under white light?
White light would produce a height that is the average of these tests.
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)
In this lab we attempted to answer the question of how does temperature affect photosynthesis in plants. I found that the higher the temperature, the less photosynthesis that occurred. I know this because at 10°C there were the most bubbles indicating photosynthesis was occurring and the more the temperature was increased, the fewer bubbles appeared. Scientific studies show that temperature affects the light independent reaction in photosynthesis. This supports are data in saying that photosynthesis slowed down.
This lab was done to demonstrate how temperature affects the rate of photosynthesis. A major concept learned from this is how photosynthesis works and how certain factors can affect how efficiently it works. Based on my experience from this lab, I know know better on how photosynthesis works which could help me on future labs.
Data:
Water Temperature (C) Bubbles per 5 seconds
10
|
6
|
25
|
5
|
40
|
2
|
*Type your question, hypothesis, etc. below. When done, submit this document via Canvas. You may also copy and paste it into your blog.
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