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IB Biology SL C4.2.20 Keeling Curve Analysis Questions

Identify the long-term atmospheric CO₂ rise and annual cycle, then link seasonal photosynthesis and respiration to the Keeling Curve in IB Biology SL C4.2.20.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Identify the long-term upward trend and annual oscillation in Mauna Loa atmospheric CO₂ records.
  • Explain annual CO₂ decreases and increases by linking Northern Hemisphere photosynthesis and respiration to seasonal carbon uptake and release.

IB Biology SL C4.2.20 Keeling Curve Analysis Questions question 1

[Maximum number: 1]

What do records from the twentieth and twenty-first century show about the concentration of carbon dioxide in the atmosphere?

A

An upward trend with annual fluctuations

B

An upward trend with no annual fluctuations

C

Annual fluctuations but no overall trend

D

Random fluctuations and no overall trend

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