IB Biology SL 4.2.20 Keeling Curve analysis Question Bank
Practise IB Biology SL 4.2.20 by interpreting seasonal carbon-dioxide variation and long-term atmospheric trends.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Identify the upward long-term trend and annual fluctuations in atmospheric carbon dioxide.
- Explain how photosynthesis and respiration contribute to seasonal carbon-dioxide changes.
C4.2.20—Keeling Curve analysis 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
A
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