The content of biodegradable substances in water is expressed by a special index called

Biological Oxygen Demand

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Litmus

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Parts per million

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mm per Hg

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Solution

The correct option is A Biological Oxygen Demand
The content of biodegradable substances in water is expressed by a special index called “biological oxygen demand” (BOD), representing the amount of oxygen needed by aerobic bacteria to decompose the wastes. As the wastes get degraded and the dissolved oxygen is used up proportionately, the need or demand for oxygen increases i.e. the BOD increases. Thus BOD is a good indirect indicator of the amount of biodegradable waste.

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Substances which cannot be decomposed by micro-organisms are called non-biodegradable substances.

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