Eutrophicated lake has BOD

Options

A. Lower
B. Higher
C. Dependent on climate
D. May be lower or higher

Answer

### Step-by-Step Solution:

1. **Understanding Eutrophication**:
- Eutrophication is the process where a water body becomes overly enriched with nutrients, primarily nitrogen and phosphorus. This often occurs due to runoff from fertilizers, sewage, and other sources.

2. **Effects of Eutrophication**:
- The excessive nutrients lead to a rapid increase in the growth of algae and aquatic plants, known as algal blooms. These blooms can cover the surface of the water, blocking sunlight and disrupting the ecosystem.

3. **Understanding BOD (Biochemical Oxygen Demand)**:
- BOD is a measure of the amount of oxygen that microorganisms will consume while decomposing organic matter in water. It is an important indicator of water quality. Higher BOD values indicate a higher level of organic pollution.

4. **Relationship Between Eutrophication and BOD**:
- As eutrophication occurs, the decomposition of the excessive organic matter (from dead algae and plants) leads to an increase in the BOD of the water body. This is because more organic material is available for bacteria to break down, which consumes oxygen in the process.

5. **Conclusion**:
- In an eutrophicated lake, the BOD is typically higher due to the increased organic matter from the decomposition of algae and other plant life. Therefore, the answer to the question is that the BOD in an eutrophicated lake is higher.

### Final Answer:
- **The BOD of an eutrophicated lake is higher.**

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