Identify the odd one out among the following | vedclass

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(C) In plants,essential elements are classified based on their mobility. Elements like $N$,$P$,$K$,and $Mg$ are highly mobile and are transported from

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Calcium

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(C) In plants,essential elements are classified based on their mobility. Elements like $N$,$P$,$K$,and $Mg$ are highly mobile and are transported from older,senescing tissues to younger,developing tissues. Calcium $(Ca)$,however,is structural and is a component of the cell wall (calcium pectate). It is considered immobile or less mobile because it is not remobilized from older tissues to younger ones. Therefore,Calcium is the odd one out.

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

Identify the odd one out among the following elements based on their mobility in plants.

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