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Ecosystems
chapter two
13
Biology
9th Grade
11/01/2012

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Term
Primary Productivity
Definition
The rate at which organic material is produced by photosynthetic organisms in an ecosystem
Term
Producers
Definition
Organisms that first capture energy
Term
Consumers
Definition
Organisms that consume plants or other organisms to obtain energy necessary to build their molecules
Term
Trophic Level
Definition
Assigning organisms in that ecosystem to a specific level
Term
Food Chain
Definition
The path of energy through the trophic levels of an ecosystem
Term
Herbivores
Definition
Animals that eat plants or other primary producers
Term
Carnivores
Definition
Animals that eat other animals
Term
Omnivores
Definition
When something is both a herbivore and a carnivore
Term
Detritivores
Definition
Organisms that obtain their energy from organic waste and dead bodies
Term
Decomposers
Definition
Something that causes decay such as bacteria and fungi
Term
Food Web
Definition
Interconnected group of food chains
Term
Energy Pyramid
Definition
A diagram in which each trophic level is represented by a block, and the blocks are stacked on top of each other, with the lowest trophic level on the bottom
Term
Biomass
Definition
The dry weight of tissue and other organic matters found in a specific ecosystem
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