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Water Pollution and Water-Borne Diseases
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When domestic sewage mixes with river water
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A
Small animals like rats will die after drinking river - water
💡 Explanation:
BOD (biochemical oxygen demand) refers to the amount of the oxygen that would be consumed if all the organic matter in one liter of water were oxidized by bacteria. The BOD test measures the rate of update of oxygen by microorganisms in a sample of water and thus, indirectly BOD is the measure of the organic matter present in the water. The greater the BOD of wastewater more is its polluting potential.
So, the correct answer is 'Small animals like rats will die after drinking river - water'.