The sources of dissolved oxygen in water is ________.

photosynthesis

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natural aeration

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mechanical aeration

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all of the above

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Solution

The correct option is A photosynthesis
Oxygen dissolves into the water from two sources one from the atmosphere and other from the plants in the water. The primary source of oxygen for a pond is from microscopic algae. By using the sunlight these produce oxygen by a process called photosynthesis and thereby release oxygen into the pond water.

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20 k P a

\times 10^{- 5} m o l d m^{- 3}

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