the flow energy in an ecosystem is considered to be a one way transport.
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Nutrients cycle through the ecosystem because matter cannot be destroyed. When an organism dies, the materials that make it up eventually make their way back into plants (usually from the soil), where they can reenter the food web.
Energy, however, is "used" at each trophic level and converted to a form that is not usable; that is, it is lost to the system. This is why food chains do not extend beyond 4 or 5 trophic levels. Also, this is why a constant supply of energy must be input to the ecosystem (usually via sunlight, but also via chemical reactions). Organisms that are able to use these forms of energy to create "food" are called autotrophs.
Energy, however, is "used" at each trophic level and converted to a form that is not usable; that is, it is lost to the system. This is why food chains do not extend beyond 4 or 5 trophic levels. Also, this is why a constant supply of energy must be input to the ecosystem (usually via sunlight, but also via chemical reactions). Organisms that are able to use these forms of energy to create "food" are called autotrophs.
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For example , consider a food chain
Grass-deer-lion
It is one way because the energy from the deer cannot be absorbed by grass because it is autotrophic only want the inorganic molecules.and energy from the lion cannot be absorbed by the deer because it is herbivores. This is enough for 3 marks.ask if wanted for 4 marks
Grass-deer-lion
It is one way because the energy from the deer cannot be absorbed by grass because it is autotrophic only want the inorganic molecules.and energy from the lion cannot be absorbed by the deer because it is herbivores. This is enough for 3 marks.ask if wanted for 4 marks
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