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If BOD of river is high, this implies th...

If BOD of river is high, this implies that the river is

A

Non polluted at all

B

Highly polluted with inorganic chemicals

C

Highly polluted with organic chemicals which are decomposed by microorganims

D

Polluted with pesticides

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The correct Answer is:
To answer the question, "If BOD of river is high, this implies that the river is...," we need to analyze the concept of Biological Oxygen Demand (BOD) and its implications for water quality. ### Step-by-Step Solution: 1. **Understanding BOD**: - BOD stands for Biological Oxygen Demand. It is a measure of the amount of oxygen that microorganisms will consume while decomposing organic matter in water. 2. **High BOD Implications**: - A high BOD value indicates that there is a significant amount of organic matter present in the water. This means that microorganisms are using a lot of oxygen to break down this organic material. 3. **Oxygen Consumption**: - As microorganisms consume oxygen to decompose organic matter, the amount of dissolved oxygen in the water decreases. This is critical because dissolved oxygen is essential for the survival of aquatic life. 4. **Consequences for Aquatic Life**: - With high BOD, the dissolved oxygen levels drop, making it difficult for fish and other aquatic organisms to survive. This can lead to a decline in biodiversity and the health of the aquatic ecosystem. 5. **Conclusion**: - Therefore, if the BOD of a river is high, it implies that the river is **polluted**. The high levels of organic waste lead to increased microbial activity, which in turn depletes the oxygen available for aquatic life. ### Final Answer: If BOD of river is high, this implies that the river is **polluted**. ---
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