Which of the following is an artificial ecosystem ?

Options

A. Forest
B. Lake
C. Rice field
D. Grassland

Answer

To determine which of the following is an artificial ecosystem, we need to analyze the options provided: forest, lake, rice field, and grassland.

### Step-by-Step Solution:

1. **Understand Ecosystems**:
- An ecosystem is a community of living organisms (biotic components) interacting with their physical environment (abiotic components).

2. **Types of Ecosystems**:
- Ecosystems can be classified into two main types:
- **Natural Ecosystems**: These occur naturally without human intervention. They are self-regulating and rich in biodiversity. Examples include forests, lakes, and grasslands.
- **Artificial Ecosystems**: These are created or modified by humans for specific purposes. They require human intervention for maintenance and sustainability. Examples include botanical gardens, parks, and crop fields.

3. **Analyze Each Option**:
- **Forest**: This is a natural ecosystem as it exists without human intervention.
- **Lake**: This is also a natural ecosystem, formed naturally and does not require human maintenance.
- **Rice Field**: This is an artificial ecosystem because it is cultivated and maintained by humans for agricultural purposes.
- **Grassland**: This is a natural ecosystem, typically existing without human intervention.

4. **Conclusion**:
- Among the options provided, the **rice field** is the only artificial ecosystem.

### Final Answer:
The correct answer is **rice field**.

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