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Question

Azotobacter and Bacillus polymyxa are examples of

A
Decomposers
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B
Non-symbiotic nitrogen fixer
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C
Symbiotic nitrogen fixer
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D
Pathogenic bacteria
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Solution

The correct option is B Non-symbiotic nitrogen fixer
The atmospheric nitrogen is not available to plants. There are some nitrogen-fixing bacteria which converts atmospheric nitrogen into ammonia which is readily available to plants. Symbiotic nitrogen-fixing bacteria like Rhizobium lives in symbiotic association with the leguminous plants. Non-symbiotic nitrogen fixer converts atmospheric nitrogen into nitrogen compounds independently. Examples include Azotobacter, Bacillus polymyxa.
Thus, the correct answer is 'Non-symbiotic nitrogen fixer.'

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