AQA A2 Biology Populations Definitions

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  • Created by: lauren
  • Created on: 23-04-14 19:57
An ecological factor that makes up part of the non-biological environment of an organism.
Abiotic
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Any organism that obtains energy by eating another. Can be primary, secondary or tertiary.
Consumer
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All conditions and resources an organism requires in order to survive and reproduce to maintain a viable population
Niche
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An organism that synthesises organic molecules from simple inorganic ones such as CO2 and water. Most are photosynthetic and in the first trophic level in a food chain.
Producer
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The evolution of two or more species from existing species
Speciation
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The total mass of living material in a specific area at a given time, usually measured as dry mass as the amount of water present can vary.
Biomass
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An ecological factor that makes up part of the living environment of an organism.
Biotic
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The placewhere an organism normally lives, characterised by physical conditions and the other species present.
Habitat
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Competition between organisms of different species
Interspecific
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Competition between organisms of the same species
Intraspecific
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The temporary movement of a population of organisms from one locality to another
Migration
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A group of individuals of the same species that occupy the same haitat at the same time
Population
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The progressive colonisation of bare rock or barren terrain by living organisms
Primary Succession
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The recolonisation of an area after an early community has been removed or destroyed.
Secondary Succession
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The environmental force altering the frequency of alleles in a population
Selection Pressure
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A group of similar organisms that can breed together to produce fertile offspring
Species
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The position of an organism in a food chain
Trophic Level
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The range and variety of organisms in a particular area
Biodiversity
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The organisms of all species that live in the same area
Community
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The organisms that make up the final stage of ecological succession
Climax Community
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Selection that operates towards one extreme un a range of variation
Directional
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A species that can colonise bare rock or ground
Pioneer
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Selection that tends to eliminate the extremes of the phenotype range within a population.
Stabilising
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Process that results in the best-adapted individuals in a population surviving to breed and pass on their favourable alleles to the next generation
Selection
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Other cards in this set

Card 2

Front

Any organism that obtains energy by eating another. Can be primary, secondary or tertiary.

Back

Consumer

Card 3

Front

All conditions and resources an organism requires in order to survive and reproduce to maintain a viable population

Back

Preview of the front of card 3

Card 4

Front

An organism that synthesises organic molecules from simple inorganic ones such as CO2 and water. Most are photosynthetic and in the first trophic level in a food chain.

Back

Preview of the front of card 4

Card 5

Front

The evolution of two or more species from existing species

Back

Preview of the front of card 5
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