| Column-$I$ | Column-$II$ |
| $P$. Structural elements | $I$. $C, H, O, N$ |
| $Q$. Energy-related chemical components | $II$. $Zn^{+2}, Mo, Mg^{+2}$ |
| $R$. Elements involved in enzyme activation or inhibition | $III$. Potassium |
| $S$. Elements involved in osmotic potential | $IV$. Phosphorus, Magnesium |
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