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(B) The deficiency of nitrogen $(N)$ in plants leads to chlorosis,which is the yellowing of leaves. Nitrogen is a major component of chlorophyll,amino

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Potassium

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(B) The deficiency of nitrogen $(N)$ in plants leads to chlorosis,which is the yellowing of leaves. Nitrogen is a major component of chlorophyll,amino acids,and nucleic acids. Its deficiency results in stunted growth,delayed flowering,and reduced protein synthesis. While magnesium deficiency also causes chlorosis,the specific symptom of yellowish edges (marginal chlorosis) is most characteristically associated with potassium $(K)$ deficiency,though nitrogen deficiency causes general yellowing of older leaves.

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	$IV$. $N, K, S, Mo$

Yellowish edges appear in leaves deficient in $....$

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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 $IV$. $N, K, S, Mo$

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