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ecology part 1

QuestionAnswer
what is ecology? scientific study of interactions among organisms and between organisms and their envirnoment
what is biosphere? part of the earth in which life excists including land water and air or atmosphere
what is species? group of similar organisms that can breed and reproduce fertile offspring
what is population? group of individuals of the same speccies that live in the same area
what is a community? assemblage of different populations that live together in a defined area
what is a ecosystem? collection of all organsims that live in a particular place, together with their nonliving envirnoment
what is an autotroph? organsism that can capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds; also called a producer
what is heterptroph? organism that obtains energy from the food it comsumes;also called a consumer
what is a food web? network of complex interactions formed by the feeding relationships among the various organsims in an ecosytem
whats a trophic level? step in a food chain pr food web
what is biomass? total amount of living tissue within a given trophic level
what is biogeopchemical cycle? process in which elements, chemical compunds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another
what is limiting nutrient? single nutrient that either is scarce or cycles very slowly, limiting the growth of organisms in an eceosystem
what is weather? condition of earth's atmosphere at a particular time and place
what is climate? average, year-after-year conditions of temperature and precipitation in a particular region
what is the green house effect? natural situation in which heat is retained in earth's atmosphere by carbon dioxide , methane, water vapor, and other gases
what is a biotic factor? biological influence on organisms within an ecosytem
what is an abiotic factor? physical or nonliving, factor that shapes an ecosystem
what is a niche? full range of physical and biological conditions in which an organsims lives and the way in which the organism uses those conditions
what is logistic growth? growth patter in which a population growth rate slows or stops following a period of exponential growth
what is carrying capacity? largest number of individuals of a population that a given envirnment can support
what is demography? scientific study of human populations
what is demographic transition? change in a population from high birth and death rates to low birth and death rates
what is green revolution? the development of highly productive crop strains and the use of moderns agricultural techniques to increase yields of food crops
what is a renewable resourse? resource that can generate quickly and that is replaceable
what is a pollutant? harmful material that can enter the biosphere through the land air or water
what is biodiversity? biological diversity the sum total of the variety of organsims in the biosphere
what is biological magnification? increasing concentration of a harmful substance in organisms at higher trophic levels in a food chain or food web
Created by: samcrookes
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