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
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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