Chapter 2Bc science 10 Chapter 2(加拿大bc省科学十年级词汇).doc
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1、.Bioaccumulation the gradual build-up of synthetic and organic chemicals in living organisms Biodegredation the breaking down of dead organic matter by living organisms such as bacteria Biomagnification the process in which chemicals not only accumulate but become more concentrated at each trophic l
2、evel in a food pyramidbiomass the total mass of living matter in a given unit areabioremediationthe act of treating waste or pollutants by the use of microorganisms (as bacteria) or plants that can break down the undesirable substances such as chemical pollutants to reverse or lessen environmental d
3、amageCarbonate a combination of carbon and oxygen that is dissolved in ocean waterCarnivores secondary consumers that eat primary consumers and often other secondary consumers. They are often at the tertiary level of a food chain; also known as top carnivores (e.g. Cougar, Polar Bear)cellular respir
4、ationthe process in which both plants and animals release carbon dioxide back into the atmosphere by converting carbohydrates and oxygen into carbon dioxide and waterconsumeran organism that eats other organismscontaminationthe introduction of chemicals, toxins, wastes, or micro-organisms into the e
5、nvironment in concentrations that are harmful to living thingsDDTan insecticide and well-known persistent organic pollutant, now banned in many countries (used to kill weeds but causes cancer)decomposersorganisms that break down wastes and dead organisms and change them into usable nutrients availab
6、le to other organismsdecompositionin biology, the breaking down of organic wastes and dead organismsdenitrificationthe process in which nitrogen is returned to the atmospheredenitrifying bacteriabacteria that convert nitrate back into nitrogen gasdetrivores精品.consumers that feed at every trophic lev
7、el, obtaining their energy and nutrients by eating dead organic matterecological pyramida food pyramid. There are three types of ecological pyramids: pyramid of biomass, pyramid of numbers, and pyramid of energyenergy flowthe flow of energy from an ecosystem to an organism and from one organism to a
8、nothereutrophicationprocess by which a body of water becomes too rich in dissolved nutrients, leading to plant growth that depletes oxygenfood chaina model that shows the flow of energy from plant to animal and from animal to animalfood pyramida model that shows the loss of energy from one trophic l
9、evel to another; often called an ecological pyramidfood weba model of the feeding relationships within an ecosystem; formed from interconnected food chainsgeologic upliftthe process of mountain building in which Earths crust folds and deeply buried rock layers rise and are exposedheavy metalsmetalli
10、c elements with a high density that are toxic to organisms at low concentrationsherbivoresprimary consumers that eat plantskeystone speciesspecies that can greatly affect population numbers and the health of an ecosystemleachingremoval by water of substances that have dissolved in moist soilnitrific
11、ationammonium is converted into nitrate精品.nitrifying bacteriaBacteria that change dissolved ammonia into nitrite compounds or nitrites into nitrate compounds.nitrogen cyclethe nutrient cycle in which nitrogen is moved through the biospherenitrogen fixationnitrogen gas is converted into compounds tha
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