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SSC Geography QUESTION #6308
Question 1
The Keeling Curve showing atmospheric CO2 concentration exhibits annual oscillations primarily due to:
  • Seasonal variation in fossil fuel combustion
  • Northern Hemisphere vegetation seasonal photosynthesis and respiration cycles✔️
  • Ocean temperature-driven CO2 solubility changes
  • Volcanic activity fluctuations
Correct Answer Explanation
Annual oscillations in the Keeling Curve (~5-7 ppm amplitude) result from seasonal vegetation cycles in the Northern Hemisphere where most land mass exists. During NH summer, photosynthesis removes CO2; during winter, respiration and decomposition release it.