Photosynthesis vs Respiration · NCERT Biology

Which process is directly responsible for maintaining atmospheric oxygen levels?

  1. Aerobic respiration
  2. Transpiration
  3. Photosynthesis
  4. Decomposition
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Correct answer: Photosynthesis

Photosynthesis releases oxygen during the splitting of water molecules. Respiration consumes oxygen rather than producing it.

Difficulty: Medium Question 12 of 20

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