A-LevelBiologyBiodiversity and conservation9700/12 · May/June 2013 · Q381 Mark
The diagram shows a simplified nitrogen cycle. [Figure 38.1] Which row shows the correct labels for P, Q, R and S?
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Adenitrification by anaerobic bacteria nitrogen fixation by nitrifying bacteria decay of leaf tissue by saprotrophic bacteria ammonification by saprotrophic fungi
Blightning action on soil nitrates nitrogen fixation by nitrogen fixing bacteria decomposition using nitrogenase enzyme decomposition by root nodule bacteria
Cnitrification by anaerobic bacteria nitrification using nitrogenase enzyme decay of leaf tissue by saprotrophic fungi assimilation of organic nitrogen
Dreduction by anaerobic bacteria nitrogen fixation by root nodule bacteria decomposition of organic nitrogen decay of urea by saprotrophic bacteria
✓ Correct answer
D: reduction by anaerobic bacteria nitrogen fixation by root nodule bacteria decomposition of organic nitrogen decay of urea by saprotrophic bacteria
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