| Column-$I$ | Column-$II$ |
| $(A)$ Water splitting reaction | $(1)$ Boron |
| $(B)$ Uptake and utilisation of $Ca^{2+}$ | $(2)$ Copper |
| $(C)$ Synthesis of auxin | $(3)$ Chlorine |
| $(D)$ Redox reaction | $(4)$ Zinc |
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| Column $X$ | Column $Y$ |
| $(1)$ Mycorrhiza | $(P)$ Free-living $N_2$-fixer |
| $(2)$ Nostoc | $(Q)$ Phosphorus absorption |
| $(3)$ Azospirillum | $(R)$ Leguminous plants |
| $(4)$ Rhizobium | $(S)$ Autotrophic $N_2$-fixer |
| Column $X$ | Column $Y$ |
| $(1)$ Muscle contraction | $(P)$ $Mg^{+2}$ |
| $(2)$ Digestion of food | $(Q)$ $Ca^{+2}$ |
| $(3)$ Energy exchange | $(R)$ $Mo$ |
| $(4)$ Carbohydrate synthesis | $(S)$ $PO_4^{-3}$ |
| $(5)$ Nitrogen fixation | $(T)$ $Cl^{-}$ |
| Column $I$ | Column $II$ |
|---|---|
| $(a)$ Manganese | $(p)$ For $O_2$ evolution |
| $(b)$ Chlorine | $(q)$ Required for thyroid gland development |
| $(c)$ Phosphorus | $(r)$ High concentration in mitochondria |
| $(d)$ Iodine | $(s)$ Component of nucleic acids |
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