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7.14 Maintaining biodiversity

5 exam questions worth 12 marks. Write your answer, open the mark scheme, then give yourself the marks you earned. Your answers are saved on this device.

0 / 12

1
Short answer [3 marks]

Give three ways biodiversity can be maintained.

Mark scheme

Any three from:

  • breeding programmes (1)
  • protecting / regenerating habitats (1)
  • hedgerows / field margins (1)
  • reducing deforestation / reforestation (1)
  • reducing CO2 emissions (1)
  • recycling (1)
  • ecotourism / international agreements (1)

Model answer

Breeding programmes for endangered species, protecting rare habitats, and replanting hedgerows around fields.

Your mark
2
Short answer [2 marks]

Explain how planting hedgerows around fields increases biodiversity.

Mark scheme

  • provide habitats / shelter / food (1)
  • for many species (of plants, insects, birds) (1)

Model answer

Hedgerows provide habitats, food and shelter for many different species of plants, insects and birds.

Your mark
3
Short answer [2 marks]

Explain how reforestation helps reduce the effects of humans on ecosystems.

Mark scheme

  • provides habitats / increases biodiversity (1)
  • removes CO2 by photosynthesis / reduces global warming (1)

Model answer

New forests provide habitats for many species and remove carbon dioxide from the air by photosynthesis.

Your mark
4
Short answer [1 mark]

Give one reason why farmers might not want to reintroduce hedgerows.

Mark scheme

takes up land / less space for crops / costs money / less income

Model answer

Hedgerows take up land that could be used to grow crops, so the farmer earns less.

Your mark
5
Extended response [4 marks]

Evaluate the use of breeding programmes in zoos to protect endangered species.

Mark scheme

Any four from:

  • increases numbers of endangered species (1)
  • can release animals into the wild (1)
  • maintains genetic variation if managed (1)
  • but small populations / inbreeding (1)
  • habitat may no longer exist for release (1)
  • expensive (1)
  • conclusion (1)

Model answer

Breeding programmes increase the numbers of endangered animals and can release them into the wild. However, the populations are small, so inbreeding is a risk, and there may be no safe habitat left for release. They work best alongside protecting the habitat.

Your mark
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