Eutrophication includes all except

Options

A. Ageing of a lake
B. Growth of aquatic plants
C. Increases the oxygen levels
D. Makes the lake shallow

Answer

### Step-by-Step Solution:

1. **Understanding Eutrophication**: Eutrophication is the process where water bodies, such as lakes, become enriched with nutrients (mainly nitrogen and phosphorus), leading to increased growth of aquatic plants and algae.

2. **Identifying the Components of Eutrophication**:
- **Aging of a Lake**: This is a natural process that occurs over time as nutrients accumulate, leading to eutrophication.
- **Growth of Aquatic Plants**: Increased nutrient levels promote the growth of aquatic plants and algae, known as algal blooms.
- **Increases in Oxygen Levels**: This is a misconception; in fact, the oxygen levels typically decrease due to the decomposition of organic matter, which consumes oxygen.
- **Makes the Lake Shallow**: As sediments accumulate from dead plants and algae, the lake can become shallower over time.

3. **Identifying the Exception**: The question asks for what is NOT included in eutrophication. Among the options:
- Aging of a lake: Included in eutrophication.
- Growth of aquatic plants: Included in eutrophication.
- Increases the oxygen levels: **NOT included in eutrophication** (oxygen levels actually decrease).
- Makes the lake shallow: Included in eutrophication.

4. **Conclusion**: The correct answer is that eutrophication does NOT include an increase in oxygen levels.

### Final Answer:
Eutrophication includes all except **increases the oxygen levels**.

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