Question:
The biofertilizer ________ supplies nitrogen and antibiotics into the soil.
The biofertilizer ________ supplies nitrogen and antibiotics into the soil.
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This free living aerobic soil bacterium fixes nitrogen and also releases antifungal substances.
Updated On: Nov 12, 2026
- Azotobacter
- Anabaena
- Azospirillum
- Rhizobium
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
Biofertilisers add nutrients to the soil through living microbes.
Step 2: Azotobacter
Azotobacter is a free-living aerobic nitrogen fixer. It also releases growth-promoting substances and antifungal antibiotics that suppress soil pathogens.
Step 3: Other options
Anabaena is a cyanobacterium and Rhizobium is a symbiotic root-nodule bacterium. They are valued for nitrogen fixation but not for antibiotic supply.
Final Answer:
Azotobacter supplies nitrogen and antibiotics to the soil. \[ \boxed{\text{(A) }\textit{Azotobacter}} \]
Biofertilisers add nutrients to the soil through living microbes.
Step 2: Azotobacter
Azotobacter is a free-living aerobic nitrogen fixer. It also releases growth-promoting substances and antifungal antibiotics that suppress soil pathogens.
Step 3: Other options
Anabaena is a cyanobacterium and Rhizobium is a symbiotic root-nodule bacterium. They are valued for nitrogen fixation but not for antibiotic supply.
Final Answer:
Azotobacter supplies nitrogen and antibiotics to the soil. \[ \boxed{\text{(A) }\textit{Azotobacter}} \]
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