Genetic information, variation and relationships between organisms - 3.4.6 Biodiversity within a community Flashcards

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1
Q

The demand for increased food production has led to areas of Heath being used to grow wheat. Explain the effect of this on the species diversity of plants

A

Reduces the species diversity as there is only one species of crop being grown.
The wheat is a better competitor for light and nutrients

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2
Q

Why might animal species diversity fall in a given area?

A
  1. Reduction in the number of plant species
  2. so less VARIETY of food sources
  3. also fewer habitats
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3
Q

Explain why it may be more useful to calculate the index of diversity than to record only the number of species present

A

The index of diversity measures the number of individuals of each species and the number of species

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4
Q

What information is required to calculate an index of diversity for a particular community

A

Number of a species

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5
Q

Farmers clear tropical forest and grow crops instead. Explain how this causes the diversity in the area to decrease

A

There is a lower diversity of plants and lower variety of plants
Fewer types of food
Fewer habitats

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6
Q

What are the 3 components of biodiversity?

A

Species diversity
Genetic diversity
Ecosystem diversity

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7
Q

What is species richness?

A

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

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8
Q

What is a community?

A

All the populations of different species living in a particular place

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9
Q

What is a population?

A

All the organisms of one particular species

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10
Q

Biodiversity is…

A

the variety of living organisms in an area

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11
Q

habitat is..

A

the place where an organism lives

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12
Q

High biodiversity means…

A

lots of different species there

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13
Q

What can you calculate as a measure of biodiversity?

A

index of diversity

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14
Q

Species richness if a measure of….

A

diversity

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15
Q

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

A

index of diversity

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16
Q

To calculate index of diversity what do you need to know?

A

total number of ALL species

total number of each species

17
Q

How can you reduce biodiversity?

A
  1. clear trees
  2. remove hedges
  3. pesticides
  4. herbicides
  5. monocultures
18
Q

Why might animal diversity increase?

A
  1. Increase in the number of plant species
  2. so more VARIETY of food sources
  3. also more habitats
19
Q

A species is

A

a group of similar organisms that are capable of reproducing and producing fertile offspring