Which of the following organisms cannot fix nitrogen?
A. Azotobacter 
B. Oscillatoria 
C. Anabaena
D. Volvox
E. Nostoc
Choose the correct answer from the options given below:
1. B only
2. E only
3. A only
4. D only
Subtopic:  Kingdom Monera: Blue Green Algae |
 72%
NEET - 2025
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Which of the following is incorrect about Cyanobacteria?

1. They are photoautotrophs

2. They lack heterocysts

3. They often form blooms in polluted water bodies

4. They have chlorophyll similar to green plants

Subtopic:  Kingdom Monera: Blue Green Algae |
 80%
From NCERT
NEET - 2020
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NEET 2026 - Target Batch - Vital
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NEET 2026 - Target Batch - Vital