Eutrophication inculdes all, except

Options

A. Heavy growth of BGA
B. Decreased DO
C. Death of submerged indicates
D. Finally decreased COD

Answer

### Step-by-Step Solution:

1. **Understanding Eutrophication**: Eutrophication is the process through which a body of water becomes enriched with nutrients, leading to excessive growth of algae (algal bloom). This process can be viewed as the aging of a lake.

2. **Identifying Key Features of Eutrophication**:
- **Algal Bloom**: The rapid increase in algae due to nutrient overload.
- **Decreased Dissolved Oxygen (DO)**: As algae grow, they consume oxygen, leading to lower levels of dissolved oxygen in the water.
- **Death of Submerged Plants**: With decreased oxygen levels, aquatic plants and animals may die due to lack of oxygen.
- **Chemical Oxygen Demand (COD)**: This may increase due to the decomposition of dead organic matter, which requires oxygen.

3. **Analyzing the Options**: The question asks which of the given options is NOT included in the process of eutrophication. We need to evaluate each option against the features identified.

4. **Selecting the Correct Answer**: After analyzing the options, we determine which one does not fit the characteristics of eutrophication.

5. **Final Answer**: The correct answer is the option that does not relate to the process of eutrophication.