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Unformatted text preview: Biology 1201 (MWF 11:30-12:30 PM) C HAPTER 10 P HOTOSYNTHESIS &#2; 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. &#2; 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 &#2; 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. &#2; Chlorophyll is also responsible for the absorption of the light energy that drives photosynthesis. &#2; Chloroplasts are primarily in cells of MESOPHYLL (in the leaf interior). &#2; CO 2 and H 2 O enter the leaf through pores called STOMATA . &#2; Water is absorbed by the roots and transported to the leaves through the vascular bundles. I SOTOPES : U NRAVELING P HOTOSYNTHESIS - 2.1.4 &#2; 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 &#2; While glucose is shown, other carbohydrates are the main products of photosynthesis. &#2; 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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