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Ch. 2 Principles of Ecology Review (Biology)

Place in which an organism lives; spends majority of it's lifetime Habitat
The presence of interbreeding individuals in one place at a given time Population
A group of biological communities that interact with the physical environment Ecosystem
Converting nitrogen from a gas to a solid/usable form by bacteria Nitrogen fixation
The movement of chemicals on a global scale from abiotic through biotic parts of the environment Biogeochemical cycle
Largest level of ecological organization Biosphere
Smallest level of ecological organization Organism
The wind blowing through branches is what type of factor in that environment? Abiotic
The caterpillar eating the trees leaves is what type of factor in that environment? Biotic
The process of pollination demonstrates what type of symbiotic relationship? Mutualistic
What type of heterotroph is a snake? Carnivore
How does ALL energy first enter an ecosystem? Sun
Where is the largest concentration of nitrogen on earth found? Atmosphere
A group of individual organisms of the same species is known as a(n) Population
The study of interactions among organisms and their environment Ecology
Collect energy from the sun; storing it for other organisms Autotrophs
Act of one organism consuming another Predation
Allows a scientist to represent or simulate a process or system Model
Close relationship that exists when two or more species live together Symbiotic relationship
Group of interacting populations Biological community
Large group of ecosystems that share the same climate and have similar types of communities Biome
Living factors in an organisms environment Biotic factors
Nonliving factors in an organisms environment Abiotc factors
Occurs when more than one organism uses a resource at the same time Competition
Portion of the earth that supports life Biosphere
Great examples of mutualistic relationships in nature; algae and a fungi Lichens
Food chains and food webs represent what kind of data? Qualitative
Ecological pyramids represent what kind of data? Quantitative
Part of all organic compounds; major component of living things Carbon
Inorganic nutrients ___ through the environment due to flow of energy in ecosystems Cycle
Nutrient needs by organisms to produce proteins Nitrogen
The current in the stream a salmon is swimming up to spawn is what time of factor in its environment? Abiotic
Most life on earth is found where? Northern hemisphere
Relationship in which one organism benefits and the other is unharmed/unaffected. Commensalism
Type of relationship in which one organism benefits at the expense of the other Parasitism
Ability to cause change; cannot be created or destroyed, simply transformed Energy
Model which shows the many ways energy can flow through organisms Food web
Simplified model representing the transfer of energy from organism to organism Food chain
Each step in a food web or food chain Trophic level
Eat fragments of dead matter int he ecosystem and return nutrients to the soil, air and water Detritivores
Release enzymes to digest organic material around them and absorb the simplified nutrients Decomposers
Anything that has mass or takes up space Matter
Chemical substance that an organism must obtain from it's environment in order to sustain life Nutrient
Total mass of living matter at each trophic level; decreases at each level Biomass
Studies water processes, such as distribution in nature, water flow in a dam or river, etc. Hydrologist
All organisms on earth rely on ___ water Fresh
Bacteria in soil convert fixed nitrogen compounds back into nitrogen gas which returns to the atmosphere Denitrification
Element that is essential for the growth and development of organisms; may be locked up in short or long term cycles Phosphorous
Created by: SavannahElkins



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