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22 Cards in this Set
- Front
- Back
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Ecology
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the scientific study of interactions among organisms and between organisms and their environment, or surroundings.
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Biosphere
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the combined portions of the planet in which all of life exists, including land, water, and air, or atmosphere.
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Species
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a group of organisms so similar to one another that they can breed and produce fertile offspring.
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Populations
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groups of individuals that belong to the same species and live in the same area.
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Communities
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asemblages of different populations that live together in a defined area.
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Ecosystem
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a collection of all the organisms that live in a particular place,together with their nonlivin, or physical, environment.
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Biome
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a group of ecosystems that have the same climate and similar domminant communities.
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Autototrphs
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use energy from the environment to fuel the assembly of simple inorganic compounds into complex organic molecules.
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Producers
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make their own food
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photosynthesis
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light energy to produce chemical reactions that convert carbon dioxide and water into oxygen and energy-rich carbohhydrates such as sugars and starches
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chemosynthesis
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when organisms use chemical energy to produce carbohydrates, performed by several bacteria.
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heterotrophs
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organisms that rely on other organisms for their energy and food supply also consumers
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herbavores
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obtain energy by eating plants only
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carnivores
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only eat animals
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omnivores
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eat plants and animals
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detrivores
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feed on plant and animal remains and other dead matter,collectivly called detrus
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decomposers
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break down organic matter
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food chain
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series of steps in which organisms transfer energy by eating and being eaten
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food web
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when the feeding relationships among the various organisms in an ecosystem form a network of complex interactions
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level
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each step in a food chain or food web
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ecological pyramid
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diagram that shows the relative amounts of energy or matter contained withen each trophic leviel in a food chain or food web
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biomass
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the total ammount of living tissue within a given trophic level
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