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Word Count: 221
The purpose of this experiment was to test the effects of two factors the wavelength and intensity of light on the rate of photosynthesis Photosynthesis is a complex process which involves the interactions of many compounds Vilet 1996 The reactions in photosynthesis can be divided into two groups the light reactions which require the presence of light and the dark reactions which are not light dependant In this laboratory session only the light reactions will be of concern Measuring the change in color of the DCPIP dye using a spectrophotometer monitored the reaction rate The spectrophotometer was used to determine the concentration of a substance by its ability to absorb radiant energy In this experiment wavelengths 450 545 650 and 750 nanometers were tested The results showed that the optimum wavelength for the reaction was around 450 nm The reaction rate at 450nm was 033 which was much was much faster than all the other wavelengths The second highest was at 650 The light intensities tested in this experiment were 150 30 12 and 6 Einsteinsm2sec The ideal light intensity for the experiment around 6 uEinsteinsm2sec and the reaction rate was 043 BibliographyLiterature CitedA Lab Manual for Integrated Principles of Biology Ed KentVliet Needham Heights Pearson Custom Publishing 1993Soloman Eldra Pearl Berg Linda R and Martin Diane W Biology Ed Edith Beard Brady 5th ed Orlando Harcourt Brace 1999
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