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FANTASY LIFE.
Monday, December 29, 2008
4)How do energy and nutrients flow through an ecosystem? Give an example of a food chain and food web.
The living organisms in any ecosystem are made up of producers, comsumers and decomposers. Almost all ecosystems run on energy captured from the sun by primary producers via photosynthesis. This energy then flows through the food chains to primary consumers (herbivores who eat and digest the plants), and on to secondary and tertiary consumers (either carnivores or omnivores). Energy is lost when it is used by the organisms to do work, or lost as heat.
Photosynthetic plants fix carbon from carbon dioxide and nitrogen from atmospheric nitrogen or nitrates present in the soil to produce amino acids.Much of the carbon and nitrogen contained in ecosystems is created by such plants, and is then consumed. Nutrients are usually returned to the ecosystem via decomposition. The entire movement of chemicals in an ecosystem is termed a biogeochemical cycle.
A biogeochemical cycle is a pathway by which a chemical element or molecule moves through both biotic and abiotic compartments of Earth
Feeding relationships between organisms in an ecosystem are represented by food chains. A food chain always begins with a producer!
General Form of a food chain
Producer--->Primary consumer--->Secondary consumer--->Tertiary consumer
In a community, food chains are interlinked to form a food web.
Labels: The ecosystem
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