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(A) In plants,mineral elements are classified based on their mobility. Elements that are actively mobilized within the plant move from older tissues t

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$Ca$

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(A) In plants,mineral elements are classified based on their mobility. Elements that are actively mobilized within the plant move from older tissues to younger developing tissues. Therefore,their deficiency symptoms appear first in older leaves. These include $N$,$P$,$K$,and $Mg$.Conversely,elements that are relatively immobile,such as $Ca$ and $S$,are structural components of cell walls or proteins and cannot be easily transported from older tissues to younger ones. Consequently,the deficiency symptoms of these immobile elements appear first in the young leaves.

Column $I$ (Disorder)	Column $II$ (Description)
$i$. Chlorosis	$a$. Localised death of tissues in leaves
$ii$. Necrosis	$b$. Premature fall of flowers,fruits and leaves
$iii$. Mottling	$c$. Yellowing of leaves due to absence of chlorophyll
$iv$. Abscission	$d$. Appearance of green and non-green patches on leaves

Deficiency symptoms of an element tend to appear first in young leaves. It indicates that the element is relatively immobile. Which one of the following elemental deficiencies would show such symptoms?

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