State the sources of dissolved oxygen in water.
(N/A) The sources of dissolved oxygen in water are as follows:
$(i)$ Photosynthesis by aquatic plants.
$(ii)$ Direct contact of the water surface with air.
$(iii)$ Mechanical aeration.
$(i)$ Photosynthesis by aquatic plants.
$(ii)$ Direct contact of the water surface with air.
$(iii)$ Mechanical aeration.
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