AP Biologymediummcq1 pt
Nitrogen enters most ecosystems' food webs through
A.nitrogen fixation by bacteria
B.animals breathing N₂
C.plants absorbing N₂ directly
D.photosynthesis of nitrogen
Explanation
Core Concept
Biological nitrogen fixation by certain bacteria and archaea is a major pathway that converts atmospheric N2 into reduced nitrogen such as ammonia that can enter food webs after assimilation. Some plants host nitrogen-fixing microbes in symbioses such as root nodules. Abiotic processes and human industrial fixation can also convert N2, so 'only nitrogen-fixing microbes' is too absolute outside the biological-fixation context.
Correct Answer
Anitrogen fixation by bacteria
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