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Standard XII
Biology
Definition of BOD
Huge quantity...
Question
Huge quantity of sewage is dumped in a river. The BOD will.
A
Increase
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B
Decrease
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C
Slightly decrease
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D
Remain unchanged
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Solution
The correct option is
A
Increase
A huge quantity of sewage increases Organic matter in the river water.
The oxygen demand by bacteria to degrade the organic matter increases.
The biological oxygen demand increases.
So, the correct option is 'Increase'.
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