Given below are two statements:

Statement I: In polluted water values of both dissolved oxygen and $B O D$ are very low.

Statement II: Eutrophication results in decrease in the amount of dissolved oxygen.

In the light of the above statements, choose the most appropriate answer from the options given below:

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Solution

Clean water would have $B O D$ value of less than $5 p p m$ whereas highly polluted water could have BOD value of $17 p p m$ or more.

Eutrophication results in decrease in the amount of dissolved oxygen.

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Clean water would have BOD value of less than 5 ppm whereas highly polluted water could have BOD value of 17 ppm or more. Eutrophication results in decrease in the amount of dissolved oxygen.

Clean water would have $B O D$ value of less than $5 p p m$ whereas highly polluted water could have BOD value of $17 p p m$ or more.

Eutrophication results in decrease in the amount of dissolved oxygen.