A water body characterized by nutrient rich water supports abundant growth of phytoplankton and other water plants on its surface. Over time, the water body gets filled with a large number of such plants and the process is called Eutrophication. In such water bodies, dissolved oxygen content is nil or very less.
The enrichment of water bodies by inorganic plant nutrients is known as ________

Options

A. oligotrophy
B. neutralisation
C. degradation
D. eutrophication

Answer

To solve the question regarding the enrichment of water bodies by inorganic plant nutrients, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question describes a water body that is rich in nutrients, leading to the growth of phytoplankton and other aquatic plants. It also mentions that this process fills the water body with plants and results in low dissolved oxygen levels.

2. **Identify Key Terms**: The key term in the question is "enrichment of water bodies by inorganic plant nutrients." This indicates that we are looking for a specific term that describes this process.

3. **Analyze the Options**:
- **Oligotrophy**: This term refers to a condition where water bodies have low nutrient levels. Since the question states that the water body is nutrient-rich, this option is incorrect.
- **Neutralization**: This term refers to balancing nutrients, indicating no excess or deficiency. This does not apply to the situation described, so this option is also incorrect.
- **Degradation**: This term involves the breakdown of complex substances into simpler ones. It does not relate to the enrichment of nutrients, making this option incorrect as well.
- **Eutrophication**: This term specifically refers to the process of nutrient enrichment in water bodies, leading to excessive growth of plants and phytoplankton. This matches the description given in the question.

4. **Select the Correct Answer**: Based on the analysis of the options, the correct answer is "Eutrophication."

### Final Answer:
The enrichment of water bodies by inorganic plant nutrients is known as **Eutrophication**.

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