Question

our atmosphere is mostly nitrogen. can plants use atmospheric nitrogen?
yes
no
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Explanation:

Plants cannot directly use atmospheric nitrogen (which is in the form of $N_2$). They rely on nitrogen - fixing bacteria (either free - living or in symbiotic relationships like in root nodules of legumes) to convert atmospheric nitrogen into forms like ammonia, nitrates, or nitrites that plants can absorb and utilize. So the correct answer is "No".

Answer:

B. No