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(D) Plants generally absorb nitrogen from the soil primarily in the form of nitrates $(NO_3^-)$.Although some plants can also absorb nitrogen as nitri

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Nitrates

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(D) Plants generally absorb nitrogen from the soil primarily in the form of nitrates $(NO_3^-)$.Although some plants can also absorb nitrogen as nitrites $(NO_2^-)$ or ammonium ions $(NH_4^+)$,nitrates are the most common and preferred form for uptake.These ions are derived from the nitrogen cycle processes occurring in the soil,where atmospheric nitrogen is converted into usable forms by nitrogen-fixing bacteria and other soil microorganisms.

Column $I$	Column $II$
$A$. Thiobacillus	$1$. Free-living nitrogen-fixing cyanobacteria
$B$. Nitrosomonas	$2$. Denitrification
$C$. Nostoc	$3$. Free-living aerobic nitrogen-fixing bacteria
$D$. Azotobacter	$4$. $NH_{3}$ to Nitrite

Most of the plants obtain or absorb nitrogen from the soil in the form of

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