IB Biology HL 4.2.20 Keeling Curve analysis Question Bank
Practise IB Biology HL 4.2.20 by analysing seasonal decreases and processes driving the Keeling Curve.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Analyse how seasonal photosynthesis produces annual decreases in atmospheric carbon dioxide.
- Evaluate atmospheric CO₂ graphs using respiration, combustion and carbon-cycle evidence.
C4.2.20—Keeling Curve analysis question 1
The graph shows data collected at Mauna Loa, USA, for monthly mean carbon dioxide concentration.
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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