Chap_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
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Photosynthesis vs. Cellular Respiration Photosynthesis is the opposite of cellular respiration. During photosynthesis, glucose and other energy-rich molecules are made through a process that requires energy from the sun. During cellular respiration, energy is obtained from glucose and other energy-rich molecules.
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---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 (glucose) from energy-poor molecules (CO 2 and H 2 O) Uses CO 2 as a carbon source and sunlight- energy as the energy source. Directly or indirectly supplies energy to most living organisms.
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What type of chemical reaction is photosynthesis? Covalent Endergonic Exergonic Ionic
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cellular respiration photosynthesis ( chloroplast ) H 2 O CO 2 sugar ATP O 2 (mitochondrion) Leaves are the major organs of photosynthesis
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Fig. 7.1
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Leaves are the major organs of photosynthesis Chlorophyll is the green pigment that gives a leaf its color. Chlorophyll is also responsible for the absorption of the light energy that drives photosynthesis Fig. 7.1a
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mesophyll cells Chloroplasts are primarily in cells of mesophyll (in the leaf interior) Fig. 7.1b
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mesophyll cells stoma CO 2 and H 2 O enter the leaf through pores called stomata or stoma Fig. 7.1b
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mesophyll cells vascular bundle (vein) stoma Water is absorbed by the roots and transported to the leaves through the vascular bundles. Fig. 7.1b
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thylakoid Stroma (fluid) Chloroplasts contain the thylakoids and the stroma Fig. 7.1d
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thylakoid stroma Thylakoids are flattened membranous sacs inside the chloroplast. Chlorophyll is located in the thylakoid membrane. Fig. 7.1d
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thylakoid stroma The thylakoids are arranged in stacks called grana . The thylakoids are where the light-dependent reactions occur. granum (stack of thylakoids Fig. 7.1d
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Photosynthesis Consists of 2 different reactions: one that is light-dependent, and one that is light-independent. The 2 different reactions occur in different regions of the choroplast.
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Sunlight is converted into chemical energy that is stored in energy-carrier molecules called ATP and NADPH. Oxygen is released as a by-product.
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This note was uploaded on 04/11/2011 for the course BIOL 1001 taught by Professor Minor during the Spring '08 term at LSU.

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Chap_7 - Chapter 7 CAPTURING SOLAR ENERGY: PHOTOSYNTHESIS...

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