A2 OCR Biology Key Terms and Definitions Populations and Sustainability

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Population
A group of organisms of the same species, living in the same place at the same time and able to breed with each other.
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Sigmoid Growth Curve
The pattern of growth shown by many organisms when first introduced into a new environment – for example, a population of microorganisms in a closed culture.
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Limiting Factor
A factor that is preventing a reaction or other process from going any faster; if the supply of the factor is increased, then the reaction rate will increase; with respect to population above a certain value.
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Carrying Capacity
The maximum population size that can be sustained within an area.
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Competition
The requirement by two different organisms of a resource that is in short supply.
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Intraspecific Competition
Competition between members of the same species.
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Interspecific Competition
Competition between members of different species.
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Niche
The role of an organism in an ecosystem; the effects that it has on other components of the ecosystem, and the effects that they have on it.
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Conservation
The management of the environment to maintain and, where possible, increase biodiversity; it is an active, dynamic process and not simply ‘preservation’.
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Coppicing
The management of woodland by cutting down the trees or shrubs in part of the wood to almost ground level and then allowing them to regrow; different parts of the wood are coppiced each year, so that at any one time the wood there are still trees.
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Rotational Coppicing
Coppicing different parts of a woodland each year, on a regular cycle.
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Coppice With Standards
Regularly cutting most of the trees and shrubs close to the ground in an area of woodland, but allowing some trees to grow to their full height.
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Clear Felling
Cutting down all the trees in a wood at the same time.
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Selective Cutting
Cutting down only chosen trees in a woodland, leaving the rest to continue to grow.
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Rotation Time
The time for which a woodland is left after harvesting, before being harvested again.
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Endemic Species
A species that is found naturally in only one country or area.
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Other cards in this set

Card 2

Front

The pattern of growth shown by many organisms when first introduced into a new environment – for example, a population of microorganisms in a closed culture.

Back

Sigmoid Growth Curve

Card 3

Front

A factor that is preventing a reaction or other process from going any faster; if the supply of the factor is increased, then the reaction rate will increase; with respect to population above a certain value.

Back

Preview of the back of card 3

Card 4

Front

The maximum population size that can be sustained within an area.

Back

Preview of the back of card 4

Card 5

Front

The requirement by two different organisms of a resource that is in short supply.

Back

Preview of the back of card 5
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