What is biological significance of Azotobacter in agriculture?

Explanation

### Step-by-Step Solution:

1. **Understanding Nitrogen's Role in Plants**:
- Nitrogen is an essential nutrient for plants, as it is a key component of amino acids, proteins, nucleic acids (DNA and RNA), and chlorophyll.
- However, plants cannot directly utilize atmospheric nitrogen (N₂) because it is in a gaseous form.

2. **Nitrogen Fixation**:
- To make nitrogen available to plants, it must be converted from its atmospheric form into a form that plants can absorb, such as ammonia (NH₃), nitrites (NO₂), or nitrates (NO₃).
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