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IB Biology HL C4.2.20 Keeling Curve Analysis Questions

Use Mauna Loa Keeling Curve data to distinguish the long-term atmospheric CO₂ rise associated with combustion from annual oscillations associated with Northern Hemisphere photosynthesis. The record begins in the late 1950s.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Interpret the Mauna Loa CO₂ record by distinguishing the long-term rise associated with combustion from annual decreases associated with Northern Hemisphere photosynthesis.

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

[Maximum number: 1]

The graph shows data collected at Mauna Loa, USA, for monthly mean carbon dioxide concentration.

Figure for Question IB Biology HL C4.2.20 Keeling Curve Analysis Questions question 1 — IB Biology HL

What causes the decreases in monthly mean carbon dioxide concentration each year?

A

Combustion increases.

B

Respiration increases.

C

Decomposition increases.

D

Photosynthesis increases.

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