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Photosynthesis Lab Report Purpose Essay

To research the effect of different wavelengths (colors) of light on plant growth during photosynthesis. Background Information:
Photosynthesis is the process by which sunlight is captured by chloroplasts within plant cells and turned into energy. This energy is used to help the plant grow roots, leaves, flowers and fruit. Energy is required by living things to: change shape, transportation, movement, growth, reproduction, etc. Red and blue light have the greatest effect on plant growth after white light The main pigment is chlorophyll which reflects green lights l Green and yellow light are the least effective

Plants can utilize light in both the red and orange end and the blue end of the spectrum Blue light is more useful for vegetable growth
Red light is more useful for reproductive and root growth
Green and yellow light is reflected and not very helpful in plant growth The most important wavelengths of the blue spectrum are from 430nm to 450nm (cool light) The most important wavelengths in the re spectrum are from 640nm to 680nm (warm light) Green and yellow light are mostly reflected off the plant and that is why it appears green in color Photosynthesis occurs more quickly with the correct amount of energy White light has a similar growth to blue light but slower.

White light is the optimal wavelength for photosynthesis because plants are able to absorb all other colors of ROYGBIV Temperature affects plant growth
It cannot be too hot because the plat will shrivel up
It cannot be to cool, or the plant will freeze
Ideal temperature for photosynthesis to occur is 68-95 degrees Fahrenheit Materials:
The materials of this experiment included: 5 100w light bulbs, 15 sugar snap peas seeds, 15 6oz.Styrofoam cups, 5 boxes, soil, 1 sheet of red cellophane,1 sheet of blue cellophane, 1 sheet of green cellophane, 1 sheet of yellow cellophane, a beaker to measure the water, a light timer, and a ruler.

Independent and Dependent Variables:
The independent variable in this experiment was the wavelength of light. The dependent variable in this experiment was the plant growth. Constants:
The amount of light each plant received
How each plant was planted
Where each plant was planted (in box)
Amount of water each plant was given
Control Group
The control in this experiment was the white light because it has all the colors available to the plant. Procedure:
1. Each box was placed in a room set to 70 degrees Fahrenheit
2. Each Styrofoam cup was filled with 4oz. of soil
3. One ungerminated sugar snap pea was planted in each cup
4. A hole was cut big enough for the light bulb to fit in the top of the box
5. A specific color of cellophane was placed on each light bulb
6. Each light was placed in the hole previously cut out on each box.
7. Each light was connected a timer in order to regulate the amount of light each plant received
8. Three Styrofoam cups were placed in each box.
9. Each plant was given one tablespoon of water a day

Data Graph:
Average Growth of Sugar Snap Peas under Different Wavelengths of Light

This experiment has proved that blue and white light are most beneficial for plant growth during photosynthesis. Next comes red light, then green, then yellow. The prime reason green and yellow light were the least beneficial to plant growth during photosynthesis is because the plant reflects these two lights the most, rather than use it for energy.

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