Nitrogen and Phosphorus Quiz

What is the main form of nitrogen in the atmosphere?

• N₂ (dinitrogen)

• Nitrate (NO₃⁻)

• Ammonia (NH₃)

• Nitrite (NO₂⁻)

Which process converts atmospheric nitrogen into ammonia in the soil?

• Biological fixation

• Nitrification

• Denitrification

• Assimilation

Which organisms are responsible for nitrogen fixation?

• Bacteria like Rhizobium

• Fungi

• Plants

• Viruses

What happens during nitrification?

• Ammonium is converted into nitrates

• Nitrogen is removed

• Nitrogen returns to the atmosphere

• Plants absorb nitrogen

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Which process converts nitrates into nitrogen gas?

• Denitrification

• Fixation

• Ammonification

• Evaporation

What is a major natural source of phosphorus in ecosystems?

• Weathering of rocks

• Acid rain

• The atmosphere

• Lightning

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Why is phosphorus essential for living organisms?

• It is part of DNA and ATP

• It is a breathable gas

• It produces solar energy

• It neutralizes toxins

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Where is most of the Earth's phosphorus stored?

• In rocks and sediments

• In the oceans

• In living organisms

• The atmosphere

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Which process releases phosphorus into the soil from organic matter?

• Decomposition

• Photosynthesis

• Evaporation

• Nitrogen fixation

Why doesn't phosphorus circulate through the atmosphere like nitrogen?

• It doesn’t form stable gaseous compounds

• It is too heavy

• It is not necessary for life

• Clouds absorb it