which one of the following is not used in organic farming

Options

A. Snail
B. Glomus
C. Earthworm
D. Oscillatoria

Answer

To determine which one of the following is not used in organic farming, we can analyze the options provided.

### Step-by-Step Solution:

1. **Understanding Organic Farming**: Organic farming is a method of farming that avoids the use of synthetic chemicals, fertilizers, pesticides, and genetically modified organisms. It relies on natural processes and materials.

2. **Evaluating the Options**:
- **Snail**: Snails are mollusks and are not typically used in organic farming practices. They do not contribute to soil health or crop production in the same way that other organisms do.
- **Glomus**: This is a genus of fungi that forms mycorrhizal associations with plant roots. It helps in nutrient absorption and is beneficial in organic farming.
- **Earthworm**: Earthworms are crucial for soil health as they break down organic matter and improve soil structure. They are commonly used in organic farming through vermicomposting.
- **Oscillatoria**: This is a genus of cyanobacteria (blue-green algae) that can fix nitrogen, enriching the soil. It is also used in organic farming.

3. **Conclusion**: Among the options provided, the only one that is not used in organic farming is **Snail**.

### Final Answer:
**Snail** is not used in organic farming.

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