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| खंड $A$ | खंड $B$ |
| $(i)$ Nitrosomonas | $(a)$ Nitrite $\rightarrow$ Nitrate |
| $(ii)$ Agrobacterium | $(b)$ Nitrogen fixative bacteria |
| $(iii)$ Rhizobium | $(c)$ $NO_3^- \rightarrow N_2$ |
| $(iv)$ Nitrobacter | $(d)$ Ammonia $\rightarrow$ Nitrite |
| $(e)$ Denitrifying bacteria |
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