Biology 1201-Chapter 10-Photosynthesis

Biology 1201-Chapter 10-Photosynthesis - Biology 1201 (MWF...

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Unformatted text preview: 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 2 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 oxygenredox reactions. T HE L EAF : A DAPTATIONS FOR P HOTOSYNTHESIS - 10.2.1  Chloroplasts are the site of photosynthesis in plants. 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...
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This note was uploaded on 11/09/2010 for the course BIOL BIOL 1201 taught by Professor Pomarico during the Fall '10 term at LSU.

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Biology 1201-Chapter 10-Photosynthesis - Biology 1201 (MWF...

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