Question
| Column A | Column B (Organisms) |
| 1. Symbiotic nitrogen fixation | a. Nitrobacter |
| 2. Denitrification | b. Cyanobacteria |
| 3. Free living nitrogen fixers | c. Rhizobium |
| 4. Nitrification | d. Paracoccus |
| Column A | Column B (Organisms) |
| 1. Symbiotic nitrogen fixation | a. Nitrobacter |
| 2. Denitrification | b. Cyanobacteria |
| 3. Free living nitrogen fixers | c. Rhizobium |
| 4. Nitrification | d. Paracoccus |
| Column A | Column B (Organisms) |
| 1. Symbiotic nitrogen fixation | c. Rhizobium |
| 2. Denitrification | d. Paracoccus |
| 3. Free living nitrogen fixers | b. Cyanobacteria |
| 4. Nitrification | a. Nitrobacter |
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