Bio 5 - Unit 5: Photosynthesis Instructor: Cheryl Dunham...

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Unit 5:  Photosynthesis Instructor: Cheryl Dunham Office: 102 LeFevre Hall Box: 114 LeFevre Hall
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KNOW YOUR  VOCABULARY
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Photosynthesis Organisms must have energy in  order to carry out the processes  necessary for life For almost every organism on our planet, the  ultimate source of energy is  the sun Sunlight is radiant energy, and those organisms  that can use this type of energy do so through the  process of  photosynthesis Other organisms can then consume these and thus  obtain the energy for themselves http://www.astronomycast.com/wp- content/uploads/2007/04/sun.jpg
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The Nature of Visible Light Electromagnetic spectrum Range of all electromagnetic radiation (energies) As  wavelength increases , the amount of  energy decreases Wavelength and energy have an  inverse  relationship Visible light  is the most useful form of light in photosynthesis Blue and violet visible light contains relatively more energy  than other forms of visible light Know the relative positions of each kind of ray http://lasp.colorado.edu/~bagenal/3720/CLASS4/06-06.jpg
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The Nature of Visible Light When light encounters an object, 3 things can occur Reflected  light – the “color” of the object Absorbed  light – all other lights that are not reflected is not visible to the eye of an observer has been taken up by the object Transmitted  light – only occurs in transparent (see-through)  objects the color of light that passes through the object is the same as the color of the object http://math.hws.edu/eck/graphicsPics/pyr.png
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Plant Pigments Molecules that absorb light are called  pigments The most important photosynthetic pigment is  chlorophyll  a However all organisms that use photosynthesis have  other pigments besides chlorophyll  a   Accessory pigments molecules that absorb light and pass it to chlorophyll  a have accessory pigments so that plants are able to use  the full light spectrum chlorophyll  b carotene phycoerythrin phycocyanin http://www.arboretum.fullerton.edu/grow/images/Maple_Le af_4.gif
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Each pigment has a specific  absorption spectrum This corresponds to the wavelengths of light that they absorb (use)  most Peaks  indicate areas where the pigment  absorbs  the corresponding  wavelength (and energy) the  most http://www.uic.edu/classes/bios/bios100/lecturesf04am/absorption-spectrum.jpg http://www.life.uiuc.edu/govindjee/paper/fig5.gif
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Bio 5 - Unit 5: Photosynthesis Instructor: Cheryl Dunham...

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