Plants take nitrogen from the soil by absorption through their roots as

Nitrate ions

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Nitrite ions

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Ammonium ions

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All of the above

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Solution

The correct options are
A Nitrate ions
D Ammonium ions
Plants take nitrogen from the soil by absorption through their roots as nitrate ions and ammonium ions.Nitrite is intermediate and gets converted to either forms by symbiotic or non-symbiotic bacteria present in plant roots and soil respectively. Most nitrogen obtained by terrestrial animals can be traced back to the eating of plants at some stage of the food chain.
So, the correct answer is 'nitrate ions' and 'ammonium ions'

Suggest Corrections

1.Percolation	i.Precipitated water moves deep into the soil.
2.Nitrogen Fixation	ii.Conversion of atmospheric nitrogen into reactive compounds.
3.Denitrification	iii.Precipitated water flows through soil and porous or fractured rock.
4.Infiltration	iv.Reduction of nitrate ions of soil into gaseous nitrogen.