Which gas is removed from the atmosphere during photosynthesis?

  1. Oxygen (O2)
  2. Carbon dioxide (CO2)
  3. Nitrogen (N2)
  4. None of the above

Answer: (2) Carbon dioxide (CO2)


Plants take in CO2 from the atmosphere and use it to build organic molecules during photosynthesis, effectively removing it from the air. While oxygen is produced as a byproduct, it wasn’t initially present in the atmosphere.

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