food chain

Length: 6 Pages 1427 Words

A food chain is an idea developed by a scientist named Charles Elton in 1927. He described the way plants get energy from sunlight, plant-eating animals get their energy from eating plants, and meat-eating animals get their energy from eating other animals. The idea of a chain means that all these animals are linked together, so anything that affects one link in the chain affects everything in the chain. ]The key concept that we need to learn from food chains, food webs and food pyramids is the transfer of energy. For all life on earth there is only one available source of energy, the sun. Furthermore, only plants can change this energy into a form that can be used by animals. All plants rely either directly or indirectly on plants for their energy. Plants feed upon sunlight. Only plants have the ability to convert sunlight into food that they and animals can use. Feeding levels are also called trophic levels. The word "trophic" is a Greek word for nourishment. To determine the trophic level, we count the number of energy transfers. Green plants are at the first trophic, or nourishment, level because there has been one transfer of energy, from the sun to the plants. The first link in the chain, the plant, is called the produ Continue...

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Rabbits eat the grass, and get energy from it. Once produced, these compounds can be used to create the various types of plant tissues. As a result, decomposers are less mobile than herbivores or carnivores. As the organic matter passes through their digestive system, it is subjected to digestive enzymes and the grinding action of mineral soil particles. ------------------------------------------------------------------------Bibliography. First, the organisms making it up are in general physically smaller. For most ecosystems the model begins with the photosynthetic fixation of light, carbon dioxide, and water by plant autotrophs or primary producers who make sugars and other organic molecules. Anaerobic decomposition releases much less energy from organic matter than does aerobic respiration. Primary consumers or herbivores form the second link in the grazing food chain. It was sprayed in small concentrations, so as not to affect larger animals, but it never went away once it was sprayed. The end products of anaerobic decomposition include molecules such as carbon dioxide, water, and humus. Earthworms are one of the most important soil decomposers. The detritius food chain differs from the grazing food chain in several significant ways. Respiration is so much more efficient at releasing the energy contained in organic molecules therefore the activity of the detritus food chain is much higher in an aerobic environment, and the breakdown of materials more complete. In mature forest and grassland soils, the decomposition process will establish an equilibrium over time where litterfall additions equal the amount of organic decomposition.


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And phytoplankton are the first link in the food chain for most of the planet. As phytoplankton go, so goes the entire food chain. (973 4 )

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And phytoplankton are the first link in the food chain for most of the planet. As phytoplankton go, so goes the entire food chain. (1078 4 )

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