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 tested with different colors of the light spectrum, red and blue light will cause the plant to grow the most in height.
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?
Using different color wavelengths on different plants to see amount of growth over a span of time
Controls = type of soil, moisture, seed, amount of light, heat conditions, etc.
Changed Variable (Independent) = color (wavelength) of the light spectrum
Results:
Filter Color
|
Spinach Avg. Height (cm)
|
Radish Avg. Height (cm)
|
Lettuce Avg. Height (cm)
|
Red
|
16.87
|
12.82
|
11.12
|
Orange
|
13.5
|
8.33
|
6.67
|
Green
|
2.17
|
1.42
|
3.3
|
Blue
|
19.33
|
14.5
|
12.42
|
Violet
|
16.23
|
10.75
|
8.75
|
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 does support my hypothesis. Red and blue wavelengths do cause the most growth in plants. The plants grown under these colors were the tallest. With all of the three different seeds tested (spinach, radish, and lettuce), the blue wavelengths got the best results (tallest heights), with red and violet being the close seconds.
4. What conclusions can you draw about which color in the visible spectrum causes the most plant growth?
The color blue wavelength causes the most plant growth compared to all the others in the visible spectrum.
5. Given that white light contains all colors of the spectrum, what growth results would you expect under white light?
I would expect average plant growth in plants grown with white light because not only are red and blue wavelengths included, but also green and yellow wavelengths, which cause less growth.
Site 2: Photolab
http://www.kscience.co.uk/animations/photolab.swf
Lab Report - Photolab
How will varying light intensities affect plant growth?
If a plant is tested with varying amounts of light intensity, then the highest light intensity, 50, will make the plant grow the fastest.
Variables:
Independent Variable - Light Intensity
Dependent Variable - Plant Growth
Constants - Amount of dissolved carbon dioxide (high), temperature (25 degrees Celsius), angle of light, light bulb, amount of water, type of plant, time for # of bubbles (30 seconds)
Control - Light Intensity set at 0
Data Table
Light Intensity
|
Rate of Photosynthesis (number of oxygen bubbles)
|
0
|
0 bubbles
|
10
|
12 bubbles
|
25
|
17 bubbles
|
40
|
19 bubbles
|
50
|
20 bubbles
|
In this lab, I asked the question “How will varying light intensities affect plant growth?” I found that higher amounts of light intensity caused more growth in the plant. For the light intensity of 0, the rate of photosynthesis (the number of bubbles sent out from the plants) was 0. From 0 to 10, the number of bubbles increased by 12. From the light intensity of 10 going up to 40, the number became 19. Finally, at the intensity of 20, the number of bubbles was 20. This result would naturally occur because more sunlight would result in a higher rate of photosynthesis. Generally speaking, if the amount of a reactant increases (in the chemical equation of photosynthesis), the amount of product will increase. This data supports my claim because when the light intensity, in the experiment, increased, more bubbles are “exhaled” from the plant in water
This lab was done to demonstrate how different amount of light on a plant will affect its growth. From this lab, I learned that a higher light intensity will cause more growth in a plant, which helps me understand the concept of a chemical equation. When an amount on one side of the equation increases, the other side has to increase as well. Based on my experience with this lab, this concept of increasing reactants leading to increasing products can be applied to other labs similar to this one and others having to do with a chemical equation.
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