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AP Environmental Science 1.5 The Nitrogen Cycle Questions

Trace nitrogen between atmospheric, soil and biological reservoirs, then identify the bacterial processes that convert it into plant-available or gaseous forms.

Syllabus
Effective Fall 2025
Course
AP Environmental Science

Exam points

  • Interpret a nitrogen-cycle diagram by tracking movement between atmospheric, soil and biological reservoirs.
  • Distinguish nitrogen fixation, nitrification and denitrification from the substances converted and the direction nitrogen moves.
  • Explain how soil or root-nodule bacteria convert atmospheric nitrogen into compounds available to plants.

Covered syllabus points

ERT-1.E—Explain the steps and reservoir interactions in the nitrogen cycle

Question 1

[Maximum number: 1]

The image below is of the nitrogen cycle. Which of the following steps takes the most amount of nitrogen and adds it to the atmosphere?

Figure for Question 1 — AP Environmental Science
A

Plants

B

Lightning

C

Denitrifying bacteria

D

Decomposers

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