Chapter 10

Chapter 10 - Chapter 10 Photosynthesis >Photosynthesis...

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Chapter 10 Photosynthesis >>>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) o Uses CO 2 as a carbon source and light-energy as the energy source. o Directly or indirectly supplies energy to most living organisms. Plants and other autotrophs are the producers of the biosphere o Organisms require organic molecules used for energy by one of two nutritional modes Autotrophic nutrition Heterotrophic nutrition o Autotrophs are organisms which sustain themselves without eating anything derived from other living things. Produce their food from CO 2 and other inorganic materials from environment. o Heterotrophs live on compounds produced by other organisms. These are the consumers in the environment. Concept 10.1 Photosynthesis converts light energy to the chemical energy of food. Takes place within the leaves in most plants, where there are about 500,000 chloroplasts per mm2. Chlorophyll within the chloroplast is the green pigment that absorbs light energy and drives the synthesis of organic molecules. Chloroplasts o Found within the interior tissue of plants called mesophyll. o The stomata are tiny pores that allow CO 2 to enter and O 2 to leave. o Water absorbed by the roots is transported within the plant by veins . Oxygen
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o It was initially believed that oxygen given off by plants was simply a direct result of the splitting of carbon dioxide. o It was discovered in the 1930’s that the oxygen is actually a result of the splitting of water molecules. Evidence that chloroplast split water molecules let researchers track atoms through photosynthesis. Figure 10.4 (water being split is the source of O 2 during photosynthesis) Photosynthesis 6CO 2 + 12H 2 O + Light energy = C 6 H 12 O 6 + 6O 2 + 6H 2 O By taking into account the net consumption of water, the equation can be rewritten as follow 6CO 2 + 6H
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This note was uploaded on 05/10/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Summer '07 term at LSU.

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Chapter 10 - Chapter 10 Photosynthesis >Photosynthesis...

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