Soil conservation is achieved through

Options

A. Restricted human activities
B. Good plant cover
C. Wind screen
D. Ploughing

Explanation

**Step-by-Step Solution:**

1. **Understanding Soil Conservation**: Soil conservation refers to the practices and methods used to prevent soil erosion, maintain soil fertility, and protect the soil from degradation. It is essential for sustaining agricultural productivity and ensuring environmental health.

2. **Identifying Key Practices**: The question provides several options for achieving soil conservation: restricted human activities, good plant cover, windscreen, and plucking. Each of these options can have varying impacts on soil conservation.

3. **Evaluating Options**:
- **Restricted Human Activities**: Limiting activities such as deforestation, overgrazing, and urban development can help protect soil from erosion and degradation. However, this alone may not be sufficient for effective soil conservation.
- **Good Plant Cover**: This is crucial for soil conservation. Plants help to anchor the soil with their roots, reduce erosion caused by wind and water, and contribute organic matter to the soil, enhancing its nutrient content.
- **Windscreen**: This refers to planting trees or shrubs to act as barriers against wind. While this can help reduce wind erosion, it is not a comprehensive solution for soil conservation.
- **Plucking**: This is not a recognized method for soil conservation and may even contribute to soil degradation if it involves removing vegetation.

4. **Conclusion**: Among the options provided, the most effective method for soil conservation is "good plant cover." Planting grasses and other vegetation in eroded areas can significantly enhance soil quality and prevent further erosion.

5. **Final Answer**: Soil conservation is achieved primarily through good plant cover.

---