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22 Cards in this Set

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