Find incorrect statements
A. Rhodospirillum is aerobic
B. Anabaena and Nostoc are free-living nitrogen fixers
C. Azotobacter is anaerobic
D. Beijerinckia is aerobic
Find incorrect statements
A. Rhodospirillum is aerobic
B. Anabaena and Nostoc are free-living nitrogen fixers
C. Azotobacter is anaerobic
D. Beijerinckia is aerobic
Show Hint
- C, D
- A, C
- A, B
- B, D
The Correct Option is B
Solution and Explanation
Analysis of Statements:
A. Rhodospirillum is aerobic: ❌ Incorrect. 🔹 Rhodospirillum is generally anaerobic under certain conditions and can perform anoxygenic photosynthesis.
B. Anabaena and Nostoc are free-living nitrogen fixers: ✅ Correct. 🔹 Anabaena and Nostoc are cyanobacteria that fix atmospheric nitrogen and are free-living in aquatic or moist environments.
C. Azotobacter is anaerobic: ❌ Incorrect. 🔹 Azotobacter is an aerobic, free-living nitrogen-fixing bacterium.
D. Beijerinckia is aerobic: ✅ Correct. 🔹 Beijerinckia is an aerobic nitrogen-fixing bacterium.
Thus, the incorrect statements are: A and C
✅ Correct Answer: (2) A, C.
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