What are roles of nitrogenase enzyme and leghemoglobin in root nodules of legumes?

Explanation

### Step-by-Step Solution:

1. **Introduction to Nitrogen Fixation**:
- Nitrogen fixation is the process by which atmospheric nitrogen (N₂) is converted into ammonia (NH₃), a form that plants can utilize. This process is crucial for the growth of legumes, which form symbiotic relationships with nitrogen-fixing bacteria, primarily Rhizobium.

2. **Role of Nitrogenase Enzyme**:
- The nitrogenase enzyme is a key component in the nitrogen fixation process. It is a molybdenum-iron protein that catalyzes the conversion of atmospheric nitrogen into ammonia. This enzyme is essential for the fixation process as it facilitates the chemical reaction that transforms nitrogen gas into a biologically usable form.

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