Rapid deterioration of root and shoot tip occurs due to the deficiency of

Apple fruit develops internal cork due to the deficiency of:

Plants show certain morphological changes due to the absence of a specific element. These morphological changes are indicative of the deficiency of that particular element,which are called $........$ of the element.

In plants,a common symptom caused by the deficiency of $P, K, Ca$ and $Mg$ is the

Match the following columns:

Column-$I$	Column-$II$
$P$. Chlorosis	$I$. $Ca, Mg, Cu, K$
$Q$. Necrosis	$II$. $N, S, Mo$
$R$. Inhibition of cell division	$III$. $N, K, Mg, S, Fe, Mn, Zn, Mo$
$S$. Delay in flowering	$IV$. $N, K, S, Mo$

Premature leaf fall is due to deficiency of