A: Plants absorb nitrogen from the soil in th | vedclass

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(B) is true: Plants primarily absorb nitrogen from the soil in the form of nitrates $(NO_3^-)$ or ammonium ions $(NH_4^+)$,which are salts.$R$ is true

Vedclass · Accepted Answer

$A$ and $R$ are both true,but $R$ is not the correct explanation of $A$.

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(B) is true: Plants primarily absorb nitrogen from the soil in the form of nitrates $(NO_3^-)$ or ammonium ions $(NH_4^+)$,which are salts.$R$ is true: Nitrogen is a critical component of amino acids (the building blocks of proteins),nucleic acids ($DNA$ and $RNA$),vitamins,and chlorophyll.Conclusion: While both statements are scientifically correct,the fact that nitrogen is essential for protein synthesis $(R)$ does not explain why plants absorb it as salts from the soil $(A)$. The absorption mechanism is determined by the chemical availability in the soil solution,not by the biological function of nitrogen. Therefore,$R$ is not the correct explanation of $A$.

Column-$I$ (Element)	Column-$II$ (Function)
$A$. Calcium	$I$. Required for ionic balance
$B$. Boron	$II$. Essential for constitution of nucleic acid
$C$. Phosphorus	$III$. Required for absorption of calcium
$D$. Chlorine	$IV$. Required to activate respiratory enzyme
$E$. Manganese	$V$. Required for synthesis of mitotic spindle

$A$: Plants absorb nitrogen from the soil in the form of salts.
$R$: Nitrogen is essential for the synthesis of proteins and nucleic acids.

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$A$: Plants absorb nitrogen from the soil in the form of salts.$R$: Nitrogen is essential for the synthesis of proteins and nucleic acids.