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

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Question

(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 $A$.

Vedclass · Answer

(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 $X$	Column $Y$
$(1)$ Mycorrhiza	$(P)$ Free-living $N_2$-fixer
$(2)$ Nostoc	$(Q)$ Phosphorus absorption
$(3)$ Azospirillum	$(R)$ Leguminous plants
$(4)$ Rhizobium	$(S)$ Autotrophic $N_2$-fixer

Column-$I$	Column-$II$
$1$. Muscle contraction	$a$. $Mg^{+2}$
$2$. Digestion of food	$b$. $Ca^{+2}$
$3$. Energy exchange	$c$. $Mo$
$4$. Carbohydrate synthesis	$d$. $(PO_4)^{-3}$
$5$. Nitrogen fixation	$e$. $Cl^-$

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

Similar Questions

Statement $P$: In vertebrates,about $70$ percent of the total phosphorus is incorporated into bones and teeth.
Statement $Q$: Phosphorus is a structural component of vitamins like biotin and thiamine.

Select the correct match for $X$ and $Y$:
Column $X$ Column $Y$
$(1)$ Mycorrhiza $(P)$ Free-living $N_2$-fixer
$(2)$ Nostoc $(Q)$ Phosphorus absorption
$(3)$ Azospirillum $(R)$ Leguminous plants
$(4)$ Rhizobium $(S)$ Autotrophic $N_2$-fixer

Analogy type questions:
$(1)$ Manganese toxicity : Brown spots surrounded by chlorotic veins : Molybdenum deficiency : ........
$(2)$ Conversion of nitrogen to ammonia : Nitrogen fixation : Oxidation of nitrite to nitrate : ........

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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.