Ecosystem: Study of interaction between living and non-living components
Standing quality: Total inorganic substances presents in any ecosystem at a given time and given area
Standing crops: Amount of living material present in a population at any time.
Biomass: Can be measured as fresh weight or dry weight of organisms
Benthic: Bottom zone of the pond
Trophic: Refers to the position of organisms in food chain
Omnivores: Those eats both plants and animals
Food chain: Refers movement of energy from producers up to top carnivores
Food web: Interlocking pattern of food chain
Pyramid of number: Refers number of organisms in a successive trophic level
Pyramid of biomass: Refers to quantitative relationship of the standing crops
Pyramid of energy: Refers transformation of energy at successive trophic levels
Ten per cent law: refers only 10 per cent of energy is stored in each successive trophic levels
Bio geo chemical cycle: Exchange of nutrients between organisms and environments
Carbon cycle: Circulation of carbon among organisms and environments
Guano: It is a accumulated excrement of sea birds and bats.
Phosphorus cycle: Circulation of Phosphorus among organisms and environments
Succession: Successive replacement of one type of plant communities by other on barren or disturbed area.
Pioneers: Invaded plants on barren area
Primary succession: Plants colonising on barren area
Secondary succession: Plants colonising on disturbed area.
Climax communities: Final establishment of plant communities which are not replaced by others.