In large cities,domestic sewage ............

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(A) Domestic sewage in large cities is characterized by high organic content. $1$. $BOD$ (Biochemical Oxygen Demand) is a measure of the organic matte

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has high $BOD$ as it contains both aerobic and anaerobic bacteria.

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(A) Domestic sewage in large cities is characterized by high organic content. $1$. $BOD$ (Biochemical Oxygen Demand) is a measure of the organic matter present in water. $2$. Domestic sewage contains a large amount of biodegradable organic matter,which serves as food for microorganisms like aerobic and anaerobic bacteria. $3$. As these microorganisms decompose the organic matter,they consume dissolved oxygen,leading to a high $BOD$ value. $4$. Therefore,domestic sewage is characterized by high $BOD$ due to the presence of high organic load and associated microbial activity.

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