Log inSign up for FREE
Library

Nitrogen cycle quiz

Last updated about 2 years ago
12 questions
1

Nitrogen is a gas that makes up nearly 80% of Earth's atmosphere.

1

Nitrogen is a key component of proteins and DNA.

1

Nitrogen can be directly absorbed by plants from the atmosphere.

1

Nitrogen is converted into a usable form by lightning.

1

What is the main reservoir of nitrogen in the nitrogen cycle?

1

What process converts atmospheric nitrogen into usable nitrogen compounds?

1

What process returns nitrogen back to the atmosphere?

1

What is the primary source of energy for nitrogen fixation?

1

What are the different forms of nitrogen found in the environment?

  • Nitrates
  • Proteins
  • Ammonium
  • N2
  • Water bodies
  • Living organisms
  • Soil
  • Atmosphere
1

Which processes contribute to the nitrogen cycle?

  • Ammonium to nitrite to nitrate
  • Nitrate to nitrogen gas
  • Incorporation of nitrogen into organic molecules
  • Bacteria
  • Nitrification
  • Denitrification
  • Assimilation
  • Nitrogen fixation
1

Where do nitrogen-fixing bacteria live?

  • Rizobium
  • Azotobacter
  • Cyanobacteria
  • Diazotrophs
  • Root nodules of legume plants
  • Soil
  • Wetlands
  • Marine environments
1

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

  • Use nitrate instead of oxygen for respiration
  • Nitrate to nitrogen gas
  • Create an oxygen-low environment
  • Energy source
  • Reduce
  • Anaerobic conditions