Definitions 0.0 / 5 ? BiologyEcology, ecosystems and environmental biologyA2/A-levelWJEC Created by: 990324Created on: 17-02-17 15:59 Primary consumer Animals that feed on producers (.e.g. plants). Primary consumers are typically herbivores 1 of 12 Secondary consumer Animals that feed on primary consumers. Secondary consumers are typically carnivores 2 of 12 Producer An organism capable of producing / synthesizing its own organic compunds by photosynthesis or chemosynthesis 3 of 12 Food chain A food chain shows how each living thing gets food, and how nutrients and energy are passed from creature to creature 4 of 12 Food web A number of interlinked food chains with a number of differnt organisms or populations at each trophic level 5 of 12 Trophic level The positiona organims or population occupies in a food chain or food web 6 of 12 Biomass The total quantity of matter in an organims, population or trophic level 7 of 12 Productivity The rate at which energy is incorporated into an organims, population or trophic level (units = kJm-2y-1) 8 of 12 Primary productivity The rate at which energy in incorporated by producers in the form of organic material that can be used as food material 9 of 12 Secondary productivity The rate at which energy in incorporated into consumers whatever their trophic level 10 of 12 Gross primary productivity Tthe amount of chemical energy as biomass that primary producers create (by photosynthesis) in a given length of time 11 of 12 Net primary productivity The rate at which all the plants in an ecosystem produce net useful chemical energy 12 of 12
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