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(D) Option $D$ is correct. $Zn^{+2}$ acts as an essential cofactor or activator for the enzyme alcohol dehydrogenase.Option $A$ is incorrect because M

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$Zn^{+2}$ is an activator of alcohol dehydrogenase.

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(D) Option $D$ is correct. $Zn^{+2}$ acts as an essential cofactor or activator for the enzyme alcohol dehydrogenase.Option $A$ is incorrect because Magnesium $(Mg^{+2})$,not Phosphorus,is the central constituent of the ring structure of chlorophyll.Option $B$ is incorrect because $Mg^{+2}$ is the activator for $RuBisCO$,not $Ca^{+2}$.Option $C$ is incorrect because Manganese $(Mn^{+2})$ and Chloride $(Cl^-)$ ions are involved in the splitting of water to liberate oxygen,not Nitrogen.

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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