UNIT 4 BIOLOGY DEFINITIONS

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What is meant by a pest?
An Organism that competes with humans for food and space. It could be a danger to health. It reduces the yield.
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What is 'primary production'?
The rate at which biomass is produced per unit area per unit of time by producers.
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What is meant by biomass?
Mass of organisms per unit area J/m2
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What is meant by the standing crop?
Bodies of living organisms within unit area, eg standing crop of primary producers at one time.
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What is the gross primary product?
the total amount of energy fixed by photosynthesis and is measured as Jm2 day or as dry mass kg/ha/yr
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What is an agricultural ecosystem?
It is made of domesticated animals and plants used to produce food for mankind.
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What is productivity?
The gross productivity - energy lost in respiration.
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What is meant by the term ecosystem?
The interaction between all of the biotic and abiotic features in one area at the same time.
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What is Ammonification?
Producing ammonia from organic ammonium containing compounds. This is carried out by saprobiotic microorganisms
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What is nitrogen fixation?
The process of turning nitrogen gas in to nitrogen containing compounds.
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What is denitification?
The process of turning nitrates back in to nitrogen gas
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What is nitrification?
Turning ammonium ions in to nitrites and then nitrates
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What is meant by succession?
the term used to describe the changes in the species colonising a particular area over a long period of time.
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What is primary succession?
when the community develops of bare, uncolonised ground which has never had any vegetation growing on it. eg lava and mud flows.
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What is a community?
A group of interacting populations
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Card 2

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The rate at which biomass is produced per unit area per unit of time by producers.

Back

What is 'primary production'?

Card 3

Front

Mass of organisms per unit area J/m2

Back

Preview of the back of card 3

Card 4

Front

Bodies of living organisms within unit area, eg standing crop of primary producers at one time.

Back

Preview of the back of card 4

Card 5

Front

the total amount of energy fixed by photosynthesis and is measured as Jm2 day or as dry mass kg/ha/yr

Back

Preview of the back of card 5
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