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IB Biology SL C4.2.20 Keeling Curve Analysis Questions

The Keeling Curve records atmospheric CO₂ at Mauna Loa from the late 1950s. Interpret its long-term rise as reflecting combustion and its annual oscillation as reflecting Northern Hemisphere photosynthesis.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Interpret Mauna Loa CO₂ records by identifying the long-term rise associated with combustion and annual fluctuations associated with Northern Hemisphere photosynthesis.

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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