MCQ
Which free living microorganism helps in nitrogen fixation?
- AAnabaena
- BMycorrhizae
- ✓Azospirillum
- DRhizobium
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| X = x | 1 | 2 | 3 | 4 | 5 | 6 |
| P(X = x) | K | 3K | 5K | 7K | 8K | K |