DEFINITIONS AND KEY POINTS FOR ECOSYSTEM

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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 ---------------------------- ---------------------------- 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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