Question:
Which of the following is a nitrogen-fixing organism?
Which of the following is a nitrogen-fixing organism?
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Exam Tip:
Nitrogen-fixing organisms:
• Rhizobium (symbiotic with legumes).
• Azotobacter (free-living).
• Cyanobacteria (blue-green algae).
Nitrogen-fixing organisms:
• Rhizobium (symbiotic with legumes).
• Azotobacter (free-living).
• Cyanobacteria (blue-green algae).
Updated On: Aug 27, 2026
- Blue green algae
- Paramecium
- Rhizobium
- Nitrifying bacteria
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Nitrogen fixation is the process of converting atmospheric nitrogen into usable forms.
Certain organisms can fix nitrogen.
Step 2: Analyzing the Options:
• (A) Blue green algae: Some blue-green algae (cyanobacteria) can fix nitrogen.
• (B) Paramecium: A protozoan, does not fix nitrogen.
• (C) Rhizobium: A bacteria that fixes nitrogen in symbiotic association with legumes. Correct.
• (D) Nitrifying bacteria: Convert ammonia to nitrates, do not fix nitrogen.
Step 3: Final Answer:
Therefore, option (C) is correct.
Nitrogen fixation is the process of converting atmospheric nitrogen into usable forms.
Certain organisms can fix nitrogen.
Step 2: Analyzing the Options:
• (A) Blue green algae: Some blue-green algae (cyanobacteria) can fix nitrogen.
• (B) Paramecium: A protozoan, does not fix nitrogen.
• (C) Rhizobium: A bacteria that fixes nitrogen in symbiotic association with legumes. Correct.
• (D) Nitrifying bacteria: Convert ammonia to nitrates, do not fix nitrogen.
Step 3: Final Answer:
Therefore, option (C) is correct.
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