Biomass - The total mass of living material, normally measured in a specific area over a given period of time., Producers - An organism that synthesises organic molecules normally through photosynthesis, Consumers - Any organism that obtains energy by eating another organism, Saprobionts - An organism that obtains its food from the dead or decaying reamins of other organisms., Trophic level - Each stage in a food chain, Habitat - Where an organism lives, Calorimetry - A method used to determine the energy store in material, Ecosystem - All the living and nonliving components of a particular area., Gross primary production (GPP) - The total quantity of chemical energy stored in plant biomass in a given area or volume., Net primary production (NPP) - = gross primary production (GPP) - respiratory losses (R), Respiratory losses - The amount of energy that is not avaiable to the next stage of the food chain as it is transferred else where.,

A Level Biology Chapter 13- 13.1+13.2

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