How are organisms like Pseudomonas and Thiobacillus of great significance in nitrogen cycle ?

Explanation

### Step-by-Step Solution:

1. **Understanding the Nitrogen Cycle**: The nitrogen cycle is a natural process that involves the conversion of nitrogen from the atmosphere into forms that can be used by living organisms and then back into the atmosphere. It includes several key processes: nitrogen fixation, nitrification, and denitrification.

2. **Role of Nitrogen Fixation**: Nitrogen in the atmosphere exists primarily as N2, which is not usable by most organisms. Biological nitrogen fixation is the process where nitrogen gas (N2) is converted into ammonia (NH3), a form that can be utilized by plants. This process is essential for making nitrogen available to the ecosystem.

3. **Importance of Pseudomonas and Thiobacillus**:
- **Pseudomonas**: This genus of bacteria plays a significant role in the denitrification process. Denitrification is the conversion of nitrates (NO3-) back into nitrogen gas (N2), which is then released into the atmosphere. This process helps maintain the nitrogen balance in the soil and prevents the accumulation of nitrates.
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