Non-symbiotic nitrogen fixers are

Azotobacter

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Pseudomonas

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Soil Fungi

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Blue-Green Algae

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Solution

The correct option is A Azotobacter
The atmospheric nitrogen is not available for the plants. There are certain bacteria which converts atmospheric nitrogen into ammonia and made available for plants. There are 2 types of nitrogen-fixing bacteria, free-living (nonsymbiotic) bacteria, and non-free-living (symbiotic) bacteria. Examples of free-living bacteria include cyanobacteria, Azotobacter, Clostridium. Examples of symbiotic bacteria include Rhizobium, Bradyrhizobium.
Thus, the correct answer is 'Azotobacter.'

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