DP Biology (first assessment 2025)

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Question 23M.2.SL.TZ2.6c

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Date May 2023 Marks available [Maximum mark: 7] Reference code 23M.2.SL.TZ2.6c
Level SL Paper 2 Time zone TZ2
Command term Describe Question number c Adapted from N/A
c.
[Maximum mark: 7]
23M.2.SL.TZ2.6c
(c)

Describe how human activities have caused average surface air temperatures on Earth to increase.

[7]

Markscheme
  1. release of carbon dioxide;
  2. combustion of fossil fuels produces carbon dioxide;
  3. forest fires (caused by humans) produce carbon dioxide;
  4. deforestation reduces carbon dioxide uptake by photosynthesis;
  5. release of methane;
  6. from cattle/sheep/ruminant digestive systems / other verified source of anthropogenic methane;
  7. greenhouse effect / carbon dioxide/methane is a greenhouse gas;
  8. carbon dioxide/methane allow short wave radiation in sunlight to pass through the atmosphere;
  9. longer wave/infra-red radiation emitted by the warmed Earth’s surface;
  10. carbon dioxide/methane absorbs/reflects back longer wave/infra-red radiation;

 

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