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Question

Carbon dioxide and oxygen are balanced in the atmosphere by _____________.
  1. combustion & galvanisation
  2. ozonolysis & combustion
  3. respiration & combustion
  4. photosynthesis & respiration


Solution

The correct option is D photosynthesis & respiration
Plants take up carbon dioxide from air and give out oxygen during photosynthesis. Animals take up oxygen and release carbon dioxide during respiration. This maintains a balance between oxygen and carbon dioxide in the atmosphere.

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