Chapter 7 - Chapter 7-Capturing Solar Energy Photosynthesis...

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Chapter 7—Capturing Solar Energy: Photosynthesis Chloroplasts are the site of photosynthesis in plants. Photosynthesis vs. Cellular Respiration o Photosynthesis is the opposite of cellular respiration. o During photosynthesis, glucose and other energy-rich molecules are made through a process that requires energy from the sun. o During cellular respiration , energy is obtained from glucose and other energy-rich molecules. Photosynthesis o Photosynthesis transforms light energy trapped in chloroplasts into chemical bond energy and stores that energy in sugar and other organic molecules. Synthesis of energy-rich molecules (glucose) from energy-poor molecules (CO2 and H2O). Uses CO2 as a carbon source and sunlight-energy as the energy source. Directly or indirectly supplies energy to most living organisms. o Leaves are the major organs of photosynthesis. Photosynthesis (chloroplasts) Sugar + O2 Cellular Respiration (mitochondrion) H2O + CO2 Photosynthesis o Parts of a Leaf: Chlorophyll —the green pigment that gives a leaf its color located in the thylakoid membrane. Also responsible for the absorption of the light energy that drives photosynthesis. Chloroplasts are primarily in cells of mesophyll —in the leaf interior. CO2 and H2O enter the leaf through pores called stomata or stoma. Water is absorbed by the roots and transported to the leaves through the vascular bundles. Chloroplasts contain the thylakoids and stroma (fluid). Thylakoids are flattened membranous sacs inside the chloroplast. o The thylakoids are arranged in stacks called grana. o
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This note was uploaded on 10/30/2011 for the course BIOLOGY 1001 taught by Professor Crousillac during the Summer '10 term at LSU.

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Chapter 7 - Chapter 7-Capturing Solar Energy Photosynthesis...

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