Unit 2: Ecology

26 terms by clongd 

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Population

a group of organisms of the same species populating a given area

Community

(ecology) a group of interdependent organisms inhabiting the same region and interacting with each other

Biosphere

the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist

Ecosystem

collection of all the organisms that live in a particular place, together with abiotic factors of their environment

Food Web

a diagram that shows the feeding relationships between organisms in an ecosystem

Biome

a major biotic community characterized by the dominant forms of plant life and the prevailing climate

Photosynthesis

process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and high-energy carbohydrates such as sugars and starches

Chemosynthesis

process by which some organisms, such as certain bacteria, use chemical energy to produce carbohydrates

Producers

organisms that make their own food

Autotrophs

organisms that make their own food

Consumers

an organism that obtains energy and nutrients by feeding on other organisms or their remains.

Heterotrophs

an organism that obtains energy and nutrients by feeding on other organisms or their remains.

Herbivore

organism that obtains energy by eating only plants

Carnivore

organism that obtains energy by eating animals

Omnivore

organism that obtains energy by eating both plants and animals

Scavenger

A carnivore that obtains energy by feeding on the bodies of dead organisms.

Decomposer

organism that breaks down and obtains energy from dead organic matter

Primary Consumer

consumer that feeds directly on producers

Secondary Consumer

An organism that eats primary consumers

Tertiary Consumer

An organism that eats secondary consumers

Succession

(ecology) the gradual and orderly process of change in an ecosystem brought about by the progressive replacement of one community by another until a stable climax is established

Primary Succession

the series of changes that occur in an area where no soil or organisms exist

Secondary Succession

the series of changes that occur after a disturbance of an existing ecosystem

Abiotic

any nonliving component of an environment

Biotic

describes living factors in the environment

Organism

A living thing

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