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If BOD of a river is high it means that ...

If `BOD` of a river is high it means that the river is

A

Not polluted

B

Very much polluted with inorganic chemicals

C

Very much polluted with organic chemicals

D

Polluted with pesticides

Text Solution

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The correct Answer is:
To solve the question regarding the implications of a high Biochemical Oxygen Demand (BOD) in a river, we can follow these steps: ### Step-by-Step Solution: 1. **Understand BOD**: - BOD stands for Biochemical Oxygen Demand. It is a measure of the amount of oxygen that microorganisms will consume while decomposing organic matter in water. 2. **Interpret High BOD**: - A high BOD indicates that there is a significant amount of organic material present in the water. This means that microorganisms are using a lot of oxygen to break down this organic matter. 3. **Link BOD to Pollution**: - Since BOD is directly proportional to the amount of organic waste in the water, a high BOD suggests that there is a high concentration of organic pollutants. This indicates that the water is heavily polluted. 4. **Evaluate the Options**: - **Option A**: Not polluted - This is incorrect because a high BOD indicates pollution. - **Option B**: Very much polluted with inorganic chemicals - This is also incorrect as BOD primarily relates to organic matter, not inorganic. - **Option C**: Very much polluted with organic chemicals - This is correct, as high BOD signifies a high level of organic waste. - **Option D**: Polluted with pesticides - This is not directly indicated by BOD levels, so it is incorrect. 5. **Conclusion**: - The correct answer is that if the BOD of a river is high, it means that the river is "very much polluted with organic chemicals". ### Final Answer: **C: Very much polluted with organic chemicals.** ---
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