The Nitrogen Cycle
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Questions and Answers

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?

  • Ammonification
  • Nitrification
  • Fixation (correct)
  • Denitrification
  • 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?

    <p>Denitrification</p> Signup and view all the answers

    Under anaerobic conditions, denitrifying bacteria use nitrates in the soil to carry out respiration and produce which gas?

    <p>Nitrogen gas</p> Signup and view all the answers

    Which process converts nitrite and ammonia directly into molecular nitrogen gas?

    <p>Anaerobic ammonia oxidation</p> Signup and view all the answers

    What is the primary source of plant-available nitrogen in most ecosystems?

    <p>Nitrogen fixation</p> Signup and view all the answers

    Which process converts nitrogen gas into nitrates and nitrites?

    <p>Nitrogen fixation</p> Signup and view all the answers

    Where does nitrogen fixation primarily occur?

    <p>In the soil</p> Signup and view all the answers

    What is the role of nitrifying bacteria in the nitrogen cycle?

    <p>To convert nitrite into nitrate</p> Signup and view all the answers

    Why is it important for ammonia to be converted into nitrates or nitrites?

    <p>Because ammonia gas is toxic to plants</p> Signup and view all the answers

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