A-Level Biology - 3.4.6 Biodiversity within a community

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Last updated 6:02 PM on 7/31/26
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9 Terms

1
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What is a population?

All the organisms of one species living in a habitat

<p>All the organisms of one species living in a habitat</p>
2
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What is a community?

All the different populations that live together in a habitat

<p>All the different populations that live together in a habitat</p>
3
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What is biodiversity?

the variety of life in the world, or in a particular habitat or ecosystem.

<p>the variety of life in the world, or in a particular habitat or ecosystem.</p>
4
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What is species richness?

measure of the number of different species in a community

<p>measure of the number of different species in a community</p>
5
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Why is species richness not a good measure of biodiversity?

Does not take into account population sizes of each species

(species evenness)

6
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What is an index of diversity?

Describes the relationship between the number of species in a community and the number of individuals in each species

7
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Describe what each of the variables in the index of diversity equation means

d = N(N − 1) / Σn(n − 1)

N = total number of organisms of all species

n = total number of organisms of each species

<p>N = total number of organisms of all species</p><p>n = total number of organisms of each species</p>
8
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How do farming techniques reduce biodiversity?

Removal of woodland and hedgerows

Monoculture e.g. replace natural meadows with one type of crop

Use of pesticides

- kill pest and non-pest species, reducing species of insects

Use of herbicides: reduce species of plants, lowering species of insects, so fewer food sources for other species

<p>Removal of woodland and hedgerows</p><p>Monoculture e.g. replace natural meadows with one type of crop</p><p>Use of pesticides</p><p>- kill pest and non-pest species, reducing species of insects</p><p>Use of herbicides: reduce species of plants, lowering species of insects, so fewer food sources for other species</p>
9
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What techniques can be used to increase biodiversity?

get farmers to plant more hedgerows

protect species by law

restrict urban development in biodiverse areas