Question

5. What is the importance of oxygen dissolved in water?​

Answer 1

Answer:

Dissolved oxygen (DO) is one of the most important indicators of water quality. It is essential for the survival of fish and other aquatic organisms. Oxygen dissolves in surface water due to the aerating action of winds. Oxygen is also introduced into the water as a byproduct of aquatic plant photosynthesis.

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Answer 2

Answer:

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Explanation:

• Oxygen is a necessary element to all forms of life.
• Natural stream purification processes require adequate oxygen levels in order to provide for aerobic life forms.
• As dissolved oxygen levels in water drop below 5.0 mg/l, aquatic life is put under stress.
• The lower the concentration, the greater the stress.
• Oxygen levels that remain below 1-2 mg/l for a few hours can result in large fish kills.