| Column-$I$ | Column-$II$ |
| $I$. Nitrosomonas | Nitrite to nitrate |
| $II$. Thiobacillus | Denitrification |
| $III$. Nostoc | Free-living nitrogen fixer |
| $IV$. Azotobacter | Anaerobic nitrogen fixer |
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| Column-$I$ | Column-$II$ |
| $(a)$ Free living aerobic nitrogen fixer | $(1)$ Frankia |
| $(b)$ Denitrification | $(2)$ Anabaena |
| $(c)$ Free living anaerobic nitrogen fixer | $(3)$ Thiobacillus |
| $(d)$ Symbionts | $(4)$ Beijerinckia |
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