Increase of BOD in water leads to

Increase in the dissolved O

_{2}

concentration.

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Decrease in the dissolved O

_{2}

concentration.

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Maintenance of dissolved O

_{2}

concentration at the same level.

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No effect on dissolved O

_{2}

concentration.

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Solution

The correct option is B Decrease in the dissolved O $_{2}$ concentration.
Organic loading is occurrence of excess organic matter inside water due to sewage disposal and eutrophication. This leads to an increase in biological oxygen demand (BOD) for putrefaction. Explosive multiplication of alga leads to algal bloom. These conditions result in decrease in dissolved oxygen in water. Both toxicity due to algal toxins and decreased levels of dissolved oxygen kill aquatic animals.

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