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High value of BOD (Biochemical Oxygen Demand) indicates that:

1. Water is highly polluted
2. Water is less polluted
3. Consumption of organic matter in the water is higher by the microbes
4. Water is pure

Correct answer: Water is highly polluted

Solution

A high BOD value indicates that the water contains a large amount of organic matter, which leads to increased microbial activity and oxygen consumption, signifying high pollution levels.

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