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(A) Biochemical Oxygen Demand $(BOD)$ is defined as the amount of oxygen in milligrams required by microorganisms to metabolize the organic waste pres

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$III \rightarrow II \rightarrow I$

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(A) Biochemical Oxygen Demand $(BOD)$ is defined as the amount of oxygen in milligrams required by microorganisms to metabolize the organic waste present in one liter of water over a period of five days at $20^{\circ}C$.$BOD$ is directly proportional to the level of organic pollution in the water.$1$. Distilled water $(III)$ has the least amount of organic matter,so its $BOD$ is the lowest.$2$. Unpolluted pond water $(II)$ contains some natural organic matter,so its $BOD$ is higher than distilled water but lower than polluted water.$3$. Highly polluted pond water $(I)$ contains a large amount of organic waste,requiring more oxygen for decomposition,thus having the highest $BOD$.Therefore,the ascending order of $BOD$ value is $III \rightarrow II \rightarrow I$.

Arrange the following options in ascending order of their $BOD$ value.
$I.$ Sample of highly polluted pond water.
$II.$ Sample from unpolluted pond water.
$III.$ Distilled water.

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Arrange the following options in ascending order of their $BOD$ value.$I.$ Sample of highly polluted pond water.$II.$ Sample from unpolluted pond water.$III.$ Distilled water.