Answer
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Step 1I'll solve this problem by explaining the various ways plants obtain nitrogen, breaking it down into clear steps:
Step 2: Nitrogen Fixation
Plants cannot directly use nitrogen from the atmosphere ($$N_{2}$$), which makes up about 78% of air.
Instead, they rely on specialized processes to convert atmospheric nitrogen into usable forms.
Final Answer
Plants obtain nitrogen through symbiotic bacterial relationships, soil mineral absorption, decomposition of organic matter, and human-applied fertilizers, with bacteria playing a crucial role in converting atmospheric nitrogen into plant-usable forms.
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