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Question :When there is a decrease in BOD ?(A) When mass of organic matter is used.(B) When organic matter increases.(C) Decrease in the water level.(D) When there is an increase in the O_2quantity.

Answer»

When MASS of organic MATTER is used.
When organic matter increases.
Decrease in the WATER level.
When there is an INCREASE in the `O_2`quantity.

Solution :When mass of organic matter is used.


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