Question:
Which one of the following organism used as a biofertilizer is free living and never shows symbiosis?
Which one of the following organism used as a biofertilizer is free living and never shows symbiosis?
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{Azotobacter = free-living nitrogen fixer}.
Updated On: Feb 4, 2026
- Mycorrhiza
- Azotobacter
- Anabaena
- Rhizobium
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The Correct Option is B
Solution and Explanation
Step 1: Understanding biofertilizers.
Biofertilizers are organisms that enrich soil nutrients naturally.
Step 2: Nature of Azotobacter.
Azotobacter is a free-living nitrogen-fixing bacterium found in soil.
Step 3: Comparison with others.
Rhizobium and mycorrhiza show symbiosis, while Anabaena can also form symbiotic associations.
Biofertilizers are organisms that enrich soil nutrients naturally.
Step 2: Nature of Azotobacter.
Azotobacter is a free-living nitrogen-fixing bacterium found in soil.
Step 3: Comparison with others.
Rhizobium and mycorrhiza show symbiosis, while Anabaena can also form symbiotic associations.
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