For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than _________ ppm.

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Nisha Gupta

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📊 Environmental Engineering

Q. For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than _________ ppm.

(A) 10000
(B) 5
(C) 500
(D) 1000

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✅ Correct Answer: (B) 5

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