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(1) What is the relationship between dissolved oxygen and biochemical oxygen demand (BOD)

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Study the graph and answer the following questions
(1) What is the relationship between dissolved oxygen and biochemical oxygen demand (BOD)

(2) Mention their effect on aquatic life of the river.

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  1. The dissolved oxygen content is inversely proportional to BOD i.e. when BOD rises, the content of dissolved oxygen decreases and vice versa.
  2. When BOD is high, the aerobic aquatic organism will die due to decreased availability of disolved oxygen. When BOD is low, the content of dissolved oxygen becomes high. In clear water, aerobic aquatic organisms reap
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