Biology Unit 4

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What is the definition of a 'population'?
A population is all the organisms of one species in a habitat.
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What is the definition of a 'community'?
Populations of different species form a community.
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What is a 'Niche'?
Species occupies a niche governed by adaptation to both biotic and abiotic conditions in the habitat.
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What is the equation for mark-release-recapture technique?
.
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What are the principles of the Hardy-Weinberg equation?
The frequency of alleles will stay constant from one generation to the next; Providing no mutation or migration
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Succession occurs in natural ecosystems. Describe and explain how succession occurs.
Colonisation by pioneer species; Change in environment; Enables other species to colonise; Change in diversity; Stability increases; Climax community established
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What are the advantages of using biological agents as pest controls?
Specific to one pest; Only needs one application; Maintains low population; Pests do not develop resistance; Does not leave chemical in environment; Can be used in organic farming
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What are the disadvantages of using biological agents as pest controls?
Does not get rid of pest completely; May become a pest itself; Slow acting (lag phase)
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Explain the process of speciation.
Geographical isolation; Separate gene pools; Variation due to mutation; Different environments and selection pressures; Selection for advantageous features; Differential reproductive success; Leads to change in allele frequency; Long period of time
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Card 2

Front

What is the definition of a 'community'?

Back

Populations of different species form a community.

Card 3

Front

What is a 'Niche'?

Back

Preview of the front of card 3

Card 4

Front

What is the equation for mark-release-recapture technique?

Back

Preview of the front of card 4

Card 5

Front

What are the principles of the Hardy-Weinberg equation?

Back

Preview of the front of card 5
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