Biology unit 4

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Autotroph
An organism capable of synthesising its own food from inorganic substances eg. Light
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Heterotroph
An organism incapable of manufacturing it's own food so obtains energy from organic substances
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Tropic level
Each stage of a food chain
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Gross productivity
The total energy or nutrients assimilated by an organism
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Detrivores
Organisms that feed on dead or decaying material providing a larger surface area for micro organisms to decompose eg.worms
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Net productivity
The rate at which an ecosystem accumulates energy excluding energy lost through respiration
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Pyramids of biomass
Amount of mass of each tropic level at a given time
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Pyramids of energy
Amount of energy at each tropic level at a given time
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Pyramids of numbers
The number of organisms in an ecosystem at a given time
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Saprobionts
Micro organisms/ decomposing bacteria that release enzymes externally to digest and absorb the products
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Population
All the individuals of one species in a given area at a given time
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Community
All of the individuals of all the species in a given area at a given time
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Ecosystem
An area where all of the abiotic and biotic factors influence each other with a constant recycling of nutrients and flow of energy in a contained system
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Habitat
Where a group of organisms live (specific to a species)
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Niche
The role am organism plays in the ecosystem and how it makes use of the biotic and abiotic factors
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Biotic factors
Natural living factors such as predators, prey, intra-specific and inter-specific competition
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Abiotic factors
Non living factors such as soil pH, temperature and CO2 levels
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Species
A group of organisms with similar characteristics capable of breeding to produce fertile offspring
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Other cards in this set

Card 2

Front

An organism incapable of manufacturing it's own food so obtains energy from organic substances

Back

Heterotroph

Card 3

Front

Each stage of a food chain

Back

Preview of the back of card 3

Card 4

Front

The total energy or nutrients assimilated by an organism

Back

Preview of the back of card 4

Card 5

Front

Organisms that feed on dead or decaying material providing a larger surface area for micro organisms to decompose eg.worms

Back

Preview of the back of card 5
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