Podcast
Questions and Answers
Which of the following is the largest source of nitrogen on Earth?
Which of the following is the largest source of nitrogen on Earth?
- Biological nitrogen
- Terrestrial nitrogen
- Marine nitrogen
- Atmospheric nitrogen (correct)
Which process in the nitrogen cycle converts atmospheric nitrogen into usable forms?
Which process in the nitrogen cycle converts atmospheric nitrogen into usable forms?
- Ammonification
- Nitrification
- Fixation (correct)
- Denitrification
Why is the nitrogen cycle of particular interest to ecologists?
Why is the nitrogen cycle of particular interest to ecologists?
- It affects the climate
- It affects water quality
- It affects primary production and decomposition (correct)
- It affects soil fertility
Which process completes the nitrogen cycle by reducing nitrates back into nitrogen gas?
Which process completes the nitrogen cycle by reducing nitrates back into nitrogen gas?
Under anaerobic conditions, denitrifying bacteria use nitrates in the soil to carry out respiration and produce which gas?
Under anaerobic conditions, denitrifying bacteria use nitrates in the soil to carry out respiration and produce which gas?
Which process converts nitrite and ammonia directly into molecular nitrogen gas?
Which process converts nitrite and ammonia directly into molecular nitrogen gas?
What is the primary source of plant-available nitrogen in most ecosystems?
What is the primary source of plant-available nitrogen in most ecosystems?
Which process converts nitrogen gas into nitrates and nitrites?
Which process converts nitrogen gas into nitrates and nitrites?
Where does nitrogen fixation primarily occur?
Where does nitrogen fixation primarily occur?
What is the role of nitrifying bacteria in the nitrogen cycle?
What is the role of nitrifying bacteria in the nitrogen cycle?
Why is it important for ammonia to be converted into nitrates or nitrites?
Why is it important for ammonia to be converted into nitrates or nitrites?
