Photosynthesis

Topics: Light, Wavelength, Color Pages: 4 (981 words) Published: May 9, 2006
The effects of different wavelengths of light on the rate of photosynthesis

Introduction
This experiment was performed to investigate the effects of different wavelengths of light on the rate of photosynthesis. If a multiple colored film petri dishes are place under a 50 watt lamp, then the rate of photosynthesis will be greater for those with red, blue and clear film, than those with green and black film.

We believed the petri dishes with the red, blue and clear film would produce the best results of photosynthesis as compared to the petri dish with the green and black film. This is said because chlorophyll absorbs red and blue wavelengths of light and reflects green wavelengths of light. When referring to the light spectrum, red and violet are furthest away from green, and would be most absorbed by the leaf. White light is all the colors of the spectrum, and would have results similar to that of red and blue.

Below is a chart provided by Daniel Winik of Sidwell Friends School in Washington, DC. A similar experiment was done using Arabidopsis thaliana plants. The purpose of his experiment was Òto observe the effects of different wavelengths of light on the rate of photosynthetic rate in Arabidopsis thaliana plants.Ó

By using petri dishes with colored film, and spinach disks, we are allowing only certain wavelengths to pass through and show the rate of photosynthesis. If the experiment is done properly, it will provide us with the expected results. As the wavelengths are allowed to pass through the spinach disks will begin to float or remain the sunken at the bottom of the petri dish. The spinach leaves will float once enough O2 (a product of photosynthesis) has been accumulated.

If the hypothesis is supported, the petri dishes with the red, blue and clear film will provide the best rate of photosynthesis. The independent variable would be the wavelength of light and the dependent variable is the rate of photosynthesis measured by...
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