MCQ
Nitrogen fixer soil organisms belong to:
- AMosses.
- BBacteria.
- CGreen algae.
- DSoil fungi
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$W_0 -W_1-r-t$
| Column $I$ | Column $II$ |
| $(a)$ Potato spindle | $(i)$ Virus |
| $(b)$ Cr-Jacob disease $(CJD)$ | $(ii)$ Viroid |
| $(c)$ Cholera | $(iii)$ Prion |
| $(d)$ Leaf rolling and curling | $(iv)$ Bacteria |