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Ecology Evans
flash cards
| Question | Answer |
|---|---|
| Ecology | scientifc study of interactions among organisms between organisms and between organisms and their environment |
| Biosphere | contains the combined protions of the planet in which all life exsists, including land, water, and air, or atmosphere |
| Species | A group or organisms so similar to one another that they can breed and produce fertile offsprings |
| Populations | groups of individuals that belong to the same species and live in the same area |
| Community | Assemblages of different populations that live together in a defined area |
| Ecosystem | A collection of all the organisms that live in a particular place, together with their nonliving, or physical environment |
| Autotroph | Plants, algae, and bacteria that can capture energy from the sunlight or chemicals and use that energy to produce food |
| Heterotroph | Organisms that rely on other organisms for their energy and food supply |
| Food Web | Feeding relationships among the various organisms in an ecosystem form a network of complex interactions |
| Trophic Level | Each step in a food chain or food web |
| Biomass | The total amount of living tissue within a given trophic level |
| Biogeochemical Cycle | Process in which elements, chemical compounds, and other forms of matter are passed from one organism organism to another and from one part of the biosphere to another |
| Limiting Nutrient | Single nutrient that either is scarce or cycles very slowly, limiting the growth of organisms in an ecosystem |
| Weather | Condition on Earth's atmosphere at a particular time and place |
| Climate | Average, year-after-year conditions of temperature and precipitation in a particular region |
| Green House Effect | Natural situation in which heat is retained in Earth's atmosphere by carbon dioxide, methane, water vapor, and other gases |
| Biotic Factor | Biological influence on organisms within an ecosystem |
| Abiotic Factor | Pysical, or nonliving, factor that shapes an ecosystem |
| Niche | Full range of pysical and biological conditions in which organisms lives and the way in which the organism use those conditions |
| Logisitic Growth | Growth pattern in which a population's growth rate slows or stops following a period of exponential growth |
| Carrying Capacity | Largest number of individuals of a population that a given environment can support |
| Demography | Scientific study of human populations |
| Demographic Transition | Change in a population from high birth and death rates to low birth and death rates |
| Green Revolution | The development of highly productive crop strains and the use of modern agricultureal techniques to increase the yields of food crops |
| Renewable Resource | Resource that can regenerate quickly and that is replaceable |
| Pollutant | Harmful material that can enter the biosphere through the land, air, or water |
| Biodiversity | Biological diversity; the sum total of the variety or organisms in the biosphere |
| Biological Magnification | Increasing concentration of a harmful substance in organisms at higher trophic levels in a food chain or food web |
Created by:
henfen12
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