Which of the following forms of nitrogen cannot be absorbed directly by plants?
A
NO3-
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B
NO2-
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C
NH3
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D
N2
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Solution
The correct option is D N2 Plants are unable to absorb nitrogen directly from the atmosphere (N2). Rhizobium are nitrogen-fixing bacteria present in roots of leguminous plants which convert atmospheric nitrogen into ammonia (NH3) by the process of nitrogen fixation. The ammonia is converted into absorbable nitrates (NO3-) and nitrites (NO2-) by the process of nitrification. This is done by a bacteria called nitrobacter.