Measure of __________, gives the estimate amount of biodegradable organic matter in sewage water.

Options

A. Biomagnification
B. BOD
C. SPM
D. all except (2)

Answer

To solve the question, we need to identify the term that measures the amount of biodegradable organic matter in sewage water.

1. **Understanding the Question**: The question asks for a measure that estimates the biodegradable organic matter present in sewage water. This is important for assessing water quality and the impact of sewage on aquatic ecosystems.

2. **Evaluating Options**:
- **Biomagnification**: This term refers to the process by which toxic substances accumulate in organisms at higher levels of the food chain. It does not relate to measuring organic matter in sewage, so this is not the correct answer.
- **BOD (Biological Oxygen Demand)**: This is a measure of the amount of oxygen that microorganisms will consume while decomposing organic matter in water. A higher BOD indicates a higher amount of biodegradable organic matter present in the sewage water, making it a relevant measure for this question.
- **SPM (Suspended Particulate Matter)**: This refers to particles that are suspended in water but does not specifically measure biodegradable organic matter. Therefore, it is not the correct answer.

3. **Conclusion**: Based on the evaluation, the correct answer is **BOD (Biological Oxygen Demand)**, as it directly correlates with the amount of biodegradable organic matter in sewage water.

Final Answer: Measure of **BOD**, gives the estimate amount of biodegradable organic matter in sewage water.