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IB Biology SL D4.3.2 Positive Feedback Cycles Questions

Trace how warming triggers ice-albedo and permafrost greenhouse-gas feedbacks that amplify further warming.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain how loss of snow or polar ice lowers albedo, increases absorbed radiation and amplifies warming.
  • Explain how warming of permafrost or ice can release methane or carbon dioxide, increasing greenhouse trapping in a positive loop.

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Study D4.3.2—Positive feedback cycles conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL D4.3.2 Positive Feedback Cycles Questions question 1

[Maximum number: 1]

Which of the following may contribute to a positive feedback cycle in global warming?

A

The release of methane from thawing ice caps

B

The uptake of carbon dioxide by a reforested area

C

Higher temperatures increasing photosynthesis rates

D

The accumulation of peat in swamps

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