4.7.3 Biodiversity and human effects Flashcards Preview

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Flashcards in 4.7.3 Biodiversity and human effects Deck (13)
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1
Q

What is biodiversity?

A

The variety of different species of organisms on Earth or within an ecosystem.

2
Q

Why are ecosystems more stable when there is high biodiversity?

A

Because different species depend on each other for things like shelter and food.

3
Q

Name an ecosystem that has high biodiversity?

A

Deciduous woodland, tropical rainforest.

4
Q

Name an ecosystem that has low biodiversity?

A

Arctic, desert

5
Q

What causes water pollution?

A

Sewage and toxic chemicals from industry, fertilisers.

6
Q

Name two greenhouse gases

A

Methane

Carbon dioxide

7
Q

What human activities increase the amount of methane in the atmosphere?

A

Growing rice in paddy fields, intensively farming cattle.

8
Q

What human activities increase the amount of carbon dioxide in the atmosphere?

A

Burning fossil fuels

9
Q

How might flooding caused by global warming impact animals and plants

A

Animals and plants living in low lying areas may become flooded and their habitats may be destroyed.

10
Q

What gas is released when peat is burned?

A

Carbon dioxide

11
Q

What programmes are in place to increase biodiversity (or at least prevent the decline in biodiversity)?

A
  1. Breeding programmes
  2. Protection and regeneration of of rare habitats.
  3. Reduction of deforestation.
12
Q

Give four effects of global warming that could reduce biodiversity in an area.

A

drought
flooding
temperature change
rainfall change

13
Q

Deforestation increases the amount of carbon dioxide in the atmosphere.

Give three reasons why.

A

burning
activity of microbes
less photosynthesis