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Biology 1201-Chapter 10-Photosynthesis

Biology 1201-Chapter 10-Photosynthesis -...

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Biology 1201   (MWF 11:30-12:30 PM) C HAPTER  10 P HOTOSYNTHESIS Photosynthesis transforms light energy trapped by chloroplasts into   CHEMICAL   BOND   energy and stores that energy in  SUGAR  and other  ORGANIC   MOLECULES . Synthesis of   ENERGY - RICH   organic molecules from   ENERGY - POOR   molecules (CO and H 2 O). Uses  CO 2  as a carbon source and  LIGHT - ENERGY  as the energy source. Directly or indirectly  SUPPLIES   ENERGY  to most living organisms. Plants and other   AUTOTROPHS   are the producers of the biosphere. Organisms acquire organic molecules used for energy and carbon skeletons (food)  by one of two nutritional modes: 1. A UTOTROPHIC   NUTRITION —Producers  a. Photoautotrophs b. Chemoautotrophs 2. H ETEROTROPHIC   NUTRITION —Consumers A UTOTROPHIC   NUTRITION A nutritional mode in which the energy to live (and produce  molecules) comes from some source other than organic molecules. P HOTOAUTOTROPHIC   NUTRITION An autotrophic nutritional mode in which the energy to  live (and produce molecules) comes from light.   H ETEROTROPHIC   NUTRITION A   nutritional   mode   in   which   the   energy   to   live   (and  produce molecules) comes from organic molecules.  Takes energy out of organic molecules and oxygen—redox reactions. T HE  L EAF : A DAPTATIONS   FOR  P HOTOSYNTHESIS  - 10.2.1 Chloroplasts are the site of photosynthesis in  plants.
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Leaves are the major organs of photosynthesis. Chlorophyll —The green pigment that gives a leaf its color.  Chlorophyll is also responsible for the absorption of the light energy that drives  photosynthesis. Chloroplasts are primarily in cells of  MESOPHYLL   (in the leaf interior). CO 2  and H 2 O enter the leaf through pores called  STOMATA . Water is absorbed by the roots and transported to the leaves through the   vascular  bundles. I SOTOPES : U NRAVELING  P HOTOSYNTHESIS  - 2.1.4 Evidence that chloroplasts  SPLIT   WATER   MOLECULES  let researchers track atoms through  photosynthesis. The summary equation for photosynthesis: 6 CO 2  + 12 H 2 O +  LIGHT  E NERGY C 6 H 12 O 6  + 6 O 2  + 6 H 2 O While glucose is shown, other carbohydrates are the main products of photosynthesis. Water   is   present   on   both   sides   of   this   equation   because   photosynthesis   USES   AND   PRODUCES  H 2 O . The equation may be written as a net equation: 6 CO 2  + 6 H 2 O +  LIGHT   ENERGY C 6 H 12 O 6  + 6 O 2 C ARBON  + W ATER    C ARBOHYDRATE  + O XYGEN This looks very similar to the reverse of cellular respiration: C 6 H 12 O 6  + 6 O 2 6 CO 2   + 6 H 2 O + E NERGY  (ATP +  HEAT ) Plants use both photosynthesis and respiration, however they are  NOT
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Biology 1201-Chapter 10-Photosynthesis -...

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