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AP Environmental Science Nitrogen Cycle

Practise nitrogen-cycle questions by tracing fixation, nitrification, denitrification and reservoir transfers, then apply those processes to diagrams and ecosystem scenarios.

Syllabus
Effective Fall 2025
Course
AP Environmental Science

Exam points

  • identify the governing concept or relationship in the problem
  • justify the result with equations, diagrams or contextual evidence

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 ERT-1.E—Explain the steps and reservoir interactions in the nitrogen cycle question 1 — AP Environmental Science
A

Plants

B

Lightning

C

Denitrifying bacteria

D

Decomposers

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