B6 Biodiversity Flashcards

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1
Q

Explain why destroying heathland to grow wheat would decrease animal biodiversity.

A

Reduction in the number of plant species
:Less VARIETY of food sources
Greater competition for resources
Fewer habitats

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2
Q

What information is needed to calculate index of diversity for a community?

A

Total number of species present
Total number of each species

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3
Q

What is species richness?

A

The number of different species in a particular area at a given time

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4
Q

What is biodiversity?

A

The variety of living organisms in an area

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5
Q

Which is a better indicator of biodiversity - index of diversity or species richness?

A

Index of diversity

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6
Q

Give 3 ways in which human activity can reduce biodiversity

A

Removing trees
Remove hedgerows
Use pesticides
Use herbicides
Monoculture

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7
Q

What is a species?

A

A group of similar organisms that can reproduce and produce fertile offspring

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8
Q

How is the index of diversity calculated?

A

Σn(n-1)

where N = total number of organisms of all species and n = total number of organisms of each species.

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9
Q

Name the metal frame used when sampling an ecosystem

A

Quadrat

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10
Q

How can a random sample be achieved?

A

Place tape measures perpendicular to each other (to make the axes of a graph)
Use a random number generator to produce coordinates
Use the coordinates to place the quadrat down

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11
Q

What is sampling?

A

Selecting a group of individuals to measure that will represent the whole target population

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12
Q

Why is it important to sample randomly?

A

Prevent bias

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