Wk 3 Lec 1sf

Wk 3 Lec 1sf - Chapter7 Photosynthesis PlantPower

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Chapter 7 Photosynthesis 
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Plant Power  As the world population continues to increase and the demand for  energy grows, more fossil fuel will be burned.  Burning fossil fuel increases the  greenhouse gases  that are polluting the  atmosphere. Photosynthesis  reduces CO 2  which is the main  greenhouse gas Photosynthesis happens at a  microscopic level  but because it is carried  out repeatedly in plants around the world, it is responsible for an  enormous amount of product
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Plant Power By  converting the energy of sunlight  to chemical energy , Earth’s plants  and other photosynthetic organisms  make about 160 billion metric tons  (176 billion tons) of  carbohydrates   each year All the food consumed by people  can be traced back to  photosynthetic  plants  – either eaten directly or fed  to animals that are then consumed  And for most of human history,  burning plant material  has been a  major  source  of heat, light, and  cooking fuel 
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Plants are Autotrophs  Plants are  autotrophs  (meaning “ self-feeders ”) in that they  make their  own food  and thus sustain themselves  without   eating other organisms or even  organic molecules. The  chloroplasts  of plant cells capture  light  energy that has  traveled 150 million kilometers from the sun and  convert  it  to  chemical  energy that is stored in  sugar  and other  organic  molecules Plants make their own  organic   molecules  and are the  ultimate source of organic molecules for almost all other  organisms They are often referred to as  producers   of the biosphere  because they  produce  its food supply
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Other Autotrophs Some algae, certain protists, and  some   prokaryotes  also make food  molecules from  carbon dioxide, water,  and other  inorganic   materials  All organisms that produce  organic molecules from inorganic  molecules using the energy of light  are called  photoautotrophs   Forest plants  Kelp  Wheat fields  Cyanobacteria  All are considered  photoautotrophs  
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Chloroplasts  All green parts of a plant have  chloroplasts  in their cells and can  carry out  photosynthesis   In most plants, however, the  leaves   have the  most chloroplasts  (about half  a million per square millimeter of leaf  surface) and are the major sites of  photosynthesis  The leaves’  green color  is from  chlorophyll , a  light-absorbing pigment   in the  chloroplasts  that plays a central  role in converting  solar energy  to  chemical  energy 
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Chloroplast Structure Chloroplasts  are concentrated in the  cells  of the mesophyll , the green tissue in the 
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This note was uploaded on 09/22/2011 for the course BIO 141 taught by Professor Brown during the Fall '08 term at Drexel.

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Wk 3 Lec 1sf - Chapter7 Photosynthesis PlantPower

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