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| Element | Function |
|---|---|
| $(a)$ Iron | $(i)$ Photolysis of water |
| $(b)$ Zinc | $(ii)$ Pollen germination |
| $(c)$ Boron | $(iii)$ Required for chlorophyll biosynthesis |
| $(d)$ Manganese | $(iv)$ $IAA$ biosynthesis |
| Column-$I$ | Column-$II$ |
|---|---|
| $P$. $Mg^{2+}$ | $I$. Rubisco and $PEPcase$ |
| $Q$. $Zn^{2+}$ | $II$. Alcohol dehydrogenase |
| $R$. $Mo$ | $III$. Nitrogenase |
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