IB ESS Topic 2.1, 100% Coverage, Easy Revision guide, rated A+

IB ESS Topic 2.1, 100% Coverage, Easy Revision guide, rated A+ food chain - -diagram showing flow of energy from one organism to another food web - -diagram showing an ecosystem that contains many interconnected food chains Biotic - -the living components within an ecosystem (the community) Abiotic - -the nonliving factors of the ecosystem (the environment) Producers - -organisms that can produce their own food, convert abiotic components into living matter consumers - -organisms that eat other organisms to obtain their food levels of consumers - -primary, secondary, tertiary, quaternary pyramid - -graphical models showing the quantitative differences between the trophic levels of an ecosystem trophic level - -the position that an organism or group of organisms occupy in a food chain pyramids of numbers - -record the number of individuals at each trophic level pyramids of biomass - -represents the amount of biomass each trophic level at a particular point in time, measured in grams per meter squared or joules per meter squared pyramid of productivity - -shows the flow of energy (rate at which biomass is being generated) at each trophic level. Measured in mass or energy per meter squared per year DDT - -synthetic pesticide that is strongly absorbed by soils. Not very soluble in water, very soluble in fats, so it builds up in the fatty tissue of organisms bioaccumulation - -pesticides build up in body tissue (mainly fat) of primary consumers