For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than ______________ ppm?
Correct answer: B. 5
- A. 10000
- B. 5
- C. 500
- D. 1000
Explanation
Aquatic organisms generally require dissolved oxygen of about 5 mg/L or more for healthy survival. The very large values listed are not realistic dissolved-oxygen concentrations in water.
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