Question

describe dissolved oxygen

Answer 1

Dissolved oxygen (DO) refers to microscopic bubbles of gaseous oxygen(O2) that are mixed in water and available to aquatic organisms for respiration—a critical process for almost all organisms. ... ☑ Aquatic plants release oxygen into the water as a byproduct of photosynthesis

Answer 2

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The dissolved oxygen (DO) is oxygen that is dissolved in water. The oxygen dissolves by diffusion from the surrounding air; aeration of water that has tumbled over falls and rapids; and as a waste product of photosynthesis.

                                OR

Dissolved oxygen is the presence of these free O2 molecules within water.The bonded oxygen molecule in water (H2O) is in a compound and does not count toward dissolved oxygen levels.

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