BIOL1401 Chapter 10

BIOL1401 Chapter 10 - Chapter 10 Plant Metabolism...

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Chapter 10 Plant Metabolism
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Photosynthesis  - Converts light  energy to a usable form Respiration  - Releases stored energy Facilitates growth, development  and reproduction Metabolism  - Sum of all interrelated  biochemical processes in living  organisms Animals rely on green plants for  oxygen, food, shelter and other  products.
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Enzymes  regulate metabolic activities. Anabolism  - Forming chemical bonds to build molecules Photosynthesis reactions - Store energy by constructing carbohydrates by  combining carbon dioxide and water Catabolism  - Breaking chemical bonds Cellular respiration reactions - Release energy held in chemical bonds by  breaking down carbohydrates, producing carbon dioxide and water Photosynthesis-respiration cycle  involves transfer of energy via  oxidation-reduction reactions.
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Oxidation-reduction reactions Oxidation  - Loss of electron(s) Reduction  - Gain of electron(s) Oxidation of one compound usually  coupled with reduction of another  compound, catalyzed by same  enzyme or enzyme complex. Hydrogen atom is lost during  oxidation and gained during  reduction. Oxygen is usually final acceptor of  electron.
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Energy for most cellular activity involves adenosine triphosphate  ( ATP ). Plants make ATP using  light  as an energy source. Takes place in  chloroplasts  and other green parts of the organisms 6CO 2 +12H 2 O + light C 6 H 12 O 6 +6O 2 +6H 2 O Many intermediate steps to process, and glucose is not immediate first  product.
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Carbon dioxide  reaches chloroplasts in mesophyll cells by diffusing  through stomata into leaf interior. Note : use of fossil fuels, deforestation, and other human activities  add more carbon dioxide to atmosphere than is removed. Has potential to cause global increases in temperature May enhance photosynthesis
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Less than 1% of all water absorbed by plants used in photosynthesis. Most of remainder transpired or incorporated into plant materials. Water  is source of electrons in photosynthesis and oxygen is released as  by-product. If water is in short supply or light intensities too high, stomata close  and thus reduce supply of carbon dioxide available for photosynthesis.
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About 40% of radiant energy received on earth is in form of visible  light . Light quality  :violet to blue and red-orange to red wavelengths are used  more extensively. Green light is reflected.
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BIOL1401 Chapter 10 - Chapter 10 Plant Metabolism...

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