Ch. 5 Key Term Flashcards
Photosynthesis
Energy from the sun enters an ecosystem when organisms use sunlight to make sugar in a process.
Producer
An organism that makes its own food.
Consumers
An organism that obtains energy by feeding on other organisms.
Decomposers
Consumers that get their food by breaking down and obtains energy from dead organic matter.
Celluaer Respirtion
Which occurs inside the cell.
Food chain
A series of steps in which organisms transfer energy by eating and being eaten.
Food web
Includes More organisms and shows the feeding relationship between organisms that are possible in an ecosystem.
Trophic level
Each step through which energy is transferred in a food chain.
Carbon cycle
Is a process by which carbon is cycled between the atmosphere land water and organisms.
nitrogen fixing bacterica
Can fix atmospheric nitrogen into a useful form called ammonia.
nitogen cycle
A process in which nitrogen is cycled between atmosphere soil organisms.
phosphorus cycle
The movement of phosphorus from the environment to organisms and then back to the environment.
Ecological sucession
A Gradual process of change and replacement of some or all of the species in a community.
primary succession
The type of succession.
Srcondary succession
In areas where an ecosystem has previously existed.
