11 Questions
Which of the following is the largest source of nitrogen on Earth?
Atmospheric nitrogen
Which process in the nitrogen cycle converts atmospheric nitrogen into usable forms?
Fixation
Why is the nitrogen cycle of particular interest to ecologists?
It affects primary production and decomposition
Which process completes the nitrogen cycle by reducing nitrates back into nitrogen gas?
Denitrification
Under anaerobic conditions, denitrifying bacteria use nitrates in the soil to carry out respiration and produce which gas?
Nitrogen gas
Which process converts nitrite and ammonia directly into molecular nitrogen gas?
Anaerobic ammonia oxidation
What is the primary source of plant-available nitrogen in most ecosystems?
Nitrogen fixation
Which process converts nitrogen gas into nitrates and nitrites?
Nitrogen fixation
Where does nitrogen fixation primarily occur?
In the soil
What is the role of nitrifying bacteria in the nitrogen cycle?
To convert nitrite into nitrate
Why is it important for ammonia to be converted into nitrates or nitrites?
Because ammonia gas is toxic to plants
Test your knowledge of the nitrogen cycle and its key processes such as fixation, ammonification, nitrification, and denitrification. Learn how nitrogen is converted into different forms and circulates through various ecosystems.
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