| Column $- I$ | Column $- II$ |
| $(a)$ Nitrococcus | $(i)$ Denitrification |
| $(b)$ Rhizobium | $(ii)$ Conversion of ammonia to nitrite |
| $(c)$ Thiobacillus | $(iii)$ Conversion of nitrite to nitrate |
| $(d)$ Nitrobacter | $(iv)$ Conversion of atmospheric nitrogen to ammonia |
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