7.13 Global warming and living things
5 exam questions worth 10 marks. Write your answer, open the mark scheme, then give yourself the marks you earned. Your answers are saved on this device.
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Give two gases whose increasing levels are causing global warming.
Mark scheme
- carbon dioxide (1)
- methane (1)
Model answer
Carbon dioxide and methane.
Give three effects of global warming on living things.
Mark scheme
Any three from:
- loss of habitat (1)
- change in distribution of species (1)
- change in migration patterns (1)
- reduced biodiversity / extinction (1)
- spread of pests / diseases (1)
Model answer
Loss of habitat, species moving towards cooler areas, and changes in migration patterns.
A species of butterfly is now found 200 km further north than 50 years ago. Suggest why.
Mark scheme
- climate has warmed / global warming (1)
- northern areas now warm enough / species moves to suitable temperature (1)
Model answer
The climate has warmed, so areas further north are now warm enough for the butterfly to survive and breed.
Explain why global warming could reduce biodiversity.
Mark scheme
- habitats lost / conditions change (1)
- species that cannot move or adapt die out (1)
Model answer
As habitats change or disappear, species that cannot move or adapt quickly enough may die out, so there are fewer species.
A scientist claims a bird's change in migration is caused by global warming. Suggest one other piece of evidence that would support this claim.
Mark scheme
data over a long time showing correlation with temperature / similar changes in many species or places / a mechanism such as food availability changing
Model answer
Records over many years showing that the change in migration matches the rise in temperature.
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