environment easy MCQ

Which of the following is a greenhouse gas involved in the carbon cycle?

  1. Oxygen
  2. Nitrogen
  3. Carbon dioxide
  4. Argon

Answer: Carbon dioxide

CO2 is a major greenhouse gas that traps heat in the atmosphere and is cycled through photosynthesis, respiration, and combustion.

Topic Biogeochemical Cycles
Exam Relevance SSC, Railway
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