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Unit 2 Flashcards Bi

QuestionAnswer
What is ecology? is the scientific study of interactions among organisms and between organisms and their enviroment, or surroundings.
What is a biosphere? contains the combined portions of the planet in which all of life exists, including land, water, and air, or atmosphere.
What is a species? is a group of organisms so similar to one another that they can breeed and produce fertile offspring.
What is a population? groups of individuals that belong to the same species and live in the same area.
What is a communtitiy? assemblages of different populations that live together in a defined area.
What is a ecosystem? is a collection of all the organisms that live in a particular place, toghether with their nonliving, or physical, enviroment.
What is a autotroph? use energy from the environment to fuel the assembly of simple inorganic compounds into complex organic molecules.
What is a heterotroph? organisms that rely on other organisms for their energy and food supply.
What is a food web? When the feeding relationships among the various organisms in an ecosystem form a network of complex interactions, ecologists describe these relationships as a food web.
What is a trophic level? each step in a food chain or food web.
What is a biomass? The total amount of living tissue within a given trophic level. `
Wha tis a biogeochemical cycle? Elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another through...
What is a limiting nutrient? when an ecosystem is limited by a single nutrient that is scarce or cycles very slowly, this substance is a limiting nutrient.
What is weather? is the day-to-day condition of Earth's atmosphere at a particular time and place.
What is climate? refers to the average, year-after-year conditions of temperature and precipitation in a particular region.
What is the greenhouse effect? The natural sutuation in which heat is retained by this layer of greenhouse gases.
What is a biotic factor? The biological influences on organisms within an ecosytem.
What is a abiotic factor? physical, or nonliving, factors that shape ecosystems.
What is a niche? is the full range of physical and biological conditions in which an organism lives and the way in which the organism uses those conditions.
What is logistic growth? occurs when a population's growth slows or stops following a period or exponential growth.
What is a carrying capacity? the largest number of individuals that a given enviroment can support.
What is demography? the scientific study of human populations.
What is a demographic tranistion? a dramatic change in birth and death rates.
What is the green revolution? When goverments and scientists began a major effort to increase food productions in those countries that were not producing enough food.
What are renewable sources? can regenerate if they are alive or can be replenished by biochemical cycles if they are nonliving.
What is a pollutant? is a harmful material that can enter the biosphere through the land, air, and water.
What is biodiversity? the sum total of the genetically based variety of all organisms in the biosphere.
What is biological magnification? concentrations of a harmful substance increase in organisms at higher trophic levels in a food chain or food web.
Created by: bobstein
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