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Photosyntetic Pigments

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Introduction

PRACTICE IN BIOLOGY - STUDENT REPORT NAME: Raffaela Pastore Meneguetti DATE: April 28, 2008 Topics Hours Pl(a) Pl(b) DC DPP CE MS PS(a) PS(b) TITTLE: Photosynthetic Pigments INTRODUCTION: A photosynthetic pigment or antenna pigment is a pigment that is present in chloroplasts or photosynthetic bacteria and captures the light energy necessary for photosynthesis.Chlorophyll a is the most common of the six, present in every plant that performs photosynthesis. The reason that there are so many pigments is that each absorbs light more efficiently in a different part of the spectrum. Chlorophyll a absorbs well at a wavelength of about 400-450 nm and at 650-700 nm; chlorophyll b at 450-500 nm and at 600-650 nm. Xanthophyll absorbs well at 400-530 nm. However, none of the pigments absorbs well in the green-yellow region, which is responsible for the abundant green we see in nature. ...read more.

Middle

When a photon of light strikes a photosynthetic pigment, an electron in an atom contained within the molecule becomes excited. Energized electrons move further from the nucleus of the atom. Image 2: Source http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio20101/Bio2010120Lectures/Photosynthesis/photosyn.htm The excited (energized) molecule can pass the energy to another molecule or release it in the form of light or heat. Image 3: Source http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio20101/Bio2010120Lectures/Photosynthesis/photosyn.htm OBJETIVE: Find different results for any colored tube and cellophane involving the Geranium plants. HYPOTHESIS: I believe that each color will act and will have different results at the plant (like growth and coloration). METHODOLOGY: First of all we divided our class in 4 groups, each group must work in a Laboratory referent to something with Photosynthesis. My group kept a experience related to the Photosynthetic Pigment. ...read more.

Conclusion

Graph 2: Made by Raffaela Pastore Meneguetti Like we can see at the graph the plant with the highest growth was the red, with the highest wavelength and the cellophane blue made de Geranium have a little decrease at its size (the blue wavelength is the lowest). The follow graph shows this parallel. RESULTS AND CONCLUSION: This was a interesting laboratory, but my group forgot to do some notes. For example we only measured the lamp and the environment temperature at the beginning, respectively 34� C and 28� C. We also made another mistake, we forgot to irrigate our plants and they get really dry this can be a reason why did the Geranium with the transparent cellophane not grew. But if I can remade it I would make one more tube, a green one. Because only with the green photosynthetic pigment the plant cannot survive, the plant will not take their energy and this is also a important data. ...read more.

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