DEFINITIONS AND KEY POINTS FOR ECOSYSTEM

TERMS DEFINITIONS
Ecosystem A community with its non-living environment is called ecosystem.
Decomposers The microorganisms which decompose the bodies of dead animals and plants are called decomposes.
Ecological energetic The flow of energy through an ecosystem is called ecological energetic.
Productivity The rate at which food is manufactured by the producers in unit area and  in unit time, is called
productivity.
Gross  primary

productivity

Gross primary productivity:The total rate of photosynthesis or the total amount of organic matter Fixed is called gross primary productivity.
Net primary

productivity

Net primary productivity: The organic matter stored in plant tissues is called net primary productivity.
Trophic level Each level in the food chain in a natural community is called as trophic level.
Food web The combination of different food chains is called food web.
Ecological pyramids The representations of flow of energy through an ecosystem in the form of pyramids are called ecological pyramids.
Pyramids of numbers The pyramid which shows the relationship between the number of producers. herbivores and carnivores at successive trophic. levels is called pyramid of numbers.
Pyramids  of


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biomass

The pyramid which shows the relationship between the biomass of producers, herbivores and carnivores at successive trophic levels is called pyramid of biomass.
Pyramids of

energy

The pyramid which shows the relationship between the  energy successive trophic levels is called pyramid of energy.
Biogeochemical cycle The cyclic exchange of different chemical elements between the living and non-living component of the biosphere is called biogeochemical cycle.
Nitrogen cycle The process by which limited amount of nitrogen is circulated and re-circulated throughout the world of living organisms is known as the nitrogen cycle.

 

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