The first stable product of fixation of atmospheric nitrogen in leguminous plants is

Options

A. `NO_(3)^(-)`
B. Glutamate
C. `NO_(2)^(-)`
D. Ammonia

Answer

**Step-by-Step Solution:**

1. **Understanding Nitrogen Fixation**:
- Nitrogen fixation is the process through which atmospheric nitrogen (N₂) is converted into a form that plants can use. This process is crucial for plant nutrition and soil fertility.

2. **Role of Leguminous Plants**:
- Leguminous plants, such as peas and beans, have a unique ability to fix atmospheric nitrogen due to their symbiotic relationship with nitrogen-fixing bacteria known as Rhizobia.

3. **Formation of Nodules**:
- The roots of leguminous plants develop nodules where Rhizobia bacteria reside. These nodules are the sites of nitrogen fixation.

4. **Conversion Process**:
- Inside the nodules, the Rhizobia bacteria convert atmospheric nitrogen into ammonia (NH₃). This conversion is the first stable product of nitrogen fixation.

5. **Importance of Ammonia**:
- Ammonia produced through this process can be directly utilized by the plants for their growth and development. It is also a precursor for synthesizing other nitrogenous compounds.

6. **Conclusion**:
- Therefore, the first stable product of the fixation of atmospheric nitrogen in leguminous plants is ammonia (NH₃).

**Final Answer**: The first stable product of fixation of atmospheric nitrogen in leguminous plants is ammonia (NH₃).

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