6 - PRODUCERS READINGS: FREEMAN, 2005 Chapter 54 Pages...

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PRODUCERS READINGS: FREEMAN, 2005 Chapter 54 Pages 1229-124
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Producers are autotrophs. Autrotrophs are organisms that can make their own food - complex organic molecules - from CO 2 . Such organisms include green plants and cyanobacteria (blue-green algae). These organisms use the energy of the sun to produce their own food from CO 2 and H 2 O. Ecologists call these organisms producers.
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Producers and Photosynthesis The carbon (C) that is characteristic of organic molecules is found in very low concentrations in the atmosphere. The process by which producers use CO 2 to make organic molecules is called photosynthesis.
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An Overview of Photosynthesis Beginning in the 1770s experiments showed that the green parts of plants in the presence of sunlight, water, and carbon dioxide could release oxygen. By the 1840’s it was known that carbohydrates (sugars) were produced and a rough formula for photosynthesis could be written. ( CO 2 ) 6 ( H 2 0 ) 12 C 6 H 12 0 6 ( O 2 ) 6 SUNLIGHT
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Conversion of Light Energy into Chemical Bond Energy Photosynthesis concerts light energy into chemical bond energy by adding carbon, oxygen and hydrogen atoms to existing 5 carbon compounds This process increases plant mass, as measured by dry weight (biomass). Many other biomolecules and mineral elements are required for biomass production.
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Light Energy to Chemical Bond Energy Light energy in the presence of chlorophyll transfers electrons (H ) from water to energy
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Photosynthesis Takes Place in Chloroplasts At the plant level, photosynthesis takes place primarily in the leaf. Each leaf contains millions of chloroplasts. The chloroplast is the site of photosynthesis.
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Summary of Photosynthesis Green plants use light energy to convert water and carbon dioxide into sugar and oxygen. Sugars produced in photosynthesis are converted into biomolecules that make up the dry weight (biomass) of a plant. In short, plants are able to make themselves (organic molecules) from inorganic molecules (carbon dioxide and water).
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Atoms, Biomass and Nutrients C,H,O,N are the major atomic building blocks of living things. Their rank order of mass is: 0 > C >> H > N >> 50 or so others A comparison of biomass with the make-up of the earth leads to the conclusion that life forms concentrate certain atoms.
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VASCULAR PLANTS Recalling that biomass refers to dry weight, around 90% of plant biomass comes from carbon dioxide (CO 2 ) in the air. H from water
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This note was uploaded on 04/02/2009 for the course CHEM 112 taught by Professor Jursich during the Spring '08 term at Ill. Chicago.

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6 - PRODUCERS READINGS: FREEMAN, 2005 Chapter 54 Pages...

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