What are the sources of dissolved oxygen in water?

Answers (1)

Dissolved oxygen in the water can be used by microorganisms to oxidise organic matter. It reaches water either through the atmosphere or due to photosynthesis carried out by aquatic plants. During the night, photosynthesis cannot take place due to the absence of sunlight, but the plants continue to respire and decrease the amount of dissolved oxygen present in water. The sources of dissolved oxygen in water are-

  • Mechanical aeration
  • Photosynthesis by many aquatic plants &
  • Direct contact of air with the water surface

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