BOD is_____in polluted water and ________in potable water.

Options

A. more, less
B. less, more
C. less in both
D. medium in both

Answer

To answer the question "BOD is_____in polluted water and ________in potable water," we need to understand the concept of BOD (Biochemical Oxygen Demand) and how it relates to water quality.

### Step-by-Step Solution:

1. **Define BOD**:
- BOD stands for Biochemical Oxygen Demand. It measures the amount of dissolved oxygen that microorganisms will consume while decomposing organic matter in water.

2. **Understand Polluted Water**:
- In polluted water, there is a higher concentration of organic matter. This means that microorganisms will require more oxygen to break down this organic matter.

3. **Conclusion for Polluted Water**:
- Since more organic matter requires more oxygen, we can conclude that BOD is **more in polluted water**.

4. **Understand Potable Water**:
- Potable water, or drinking water, is clean and has very little organic matter present. This means that microorganisms will require less oxygen to break down any organic matter that might be present.

5. **Conclusion for Potable Water**:
- Since there is less organic matter in potable water, we can conclude that BOD is **less in potable water**.

6. **Final Answer**:
- Therefore, we can fill in the blanks in the question: BOD is **more in polluted water** and **less in potable water**.

### Final Answer:
BOD is **more** in polluted water and **less** in potable water.

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