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

Options

A. water is highly polluted
B. water is less polluted
C. consumption of organic matter in the water is higher by the microbas
D. water is pure

Answer

To determine what a high value of Biochemical Oxygen Demand (BOD) indicates, we can follow these steps:

### Step-by-Step Solution:

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

2. **Interpret High BOD Values**:
- A high BOD value indicates that there is a significant amount of organic matter present in the water. This means that more oxygen is required by microorganisms to break down this organic material.

3. **Link BOD to Water Quality**:
- When the BOD is high, it suggests that the water is heavily loaded with organic pollutants. This is because the microorganisms are using up a lot of oxygen to decompose the excess organic matter.

4. **Conclusion**:
- Therefore, a high BOD value indicates that the water is highly polluted, as it reflects the presence of a large amount of biodegradable material that is being decomposed by microorganisms.

5. **Select the Correct Option**:
- Based on the understanding that high BOD signifies high levels of organic pollution, the correct answer is: **Water is highly polluted** (Option 1).

### Final Answer:
High value of BOD indicates that water is highly polluted.

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