Exploring the Nitrogen Cycle

What is the main reservoir for nitrogen?

• Oceans

• Soil

• Atmosphere

• Plants

Which form of nitrogen is not usable by plants and animals?

• Nitrate (NO3)

• Ammonia (NH3)

• Ammonium (NH4)

• Nitrogen gas (N2)

What is the process called when bacteria convert N2 to NH3?

• Nitrification

• Denitrification

• Nitrogen fixation

• Ammonification

Which bacteria live in the root nodules of legumes and fix nitrogen?

• Nitrobacter

• Rhizobacteria

• Pseudomonas

• Azotobacter

What is the process called when plants and animals take in nitrogen and incorporate it into their bodies?

• Ammonification

• Assimilation

• Denitrification

• Nitrification

Tags

NGSS.MS-LS2-1

What is the process of converting ammonium (NH4) into nitrate (NO3) called?

• Nitrification

• Ammonification

• Denitrification

• Assimilation

Tags

NGSS.MS-LS2-3

How do humans impact the nitrogen cycle by releasing nitrous oxide?

• By planting more trees

• By using synthetic fertilizers

• By clearing land and tilling soil

• By reducing fossil fuel use

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-4

What environmental issue is caused by ammonia volatilization?

• Deforestation

• Ozone depletion

• Acid rain

• Global warming

Tags

NGSS.HS-ESS3-5

What is the result of leaching and eutrophication in aquatic systems?

• Algae blooms

• Cleaner water

• Increased fish population

• More plant growth

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

What is the practice question for this lesson?

• Define global warming.

• Describe one chemical transformation in the nitrogen cycle and its importance.

• Explain the carbon cycle.

• List the steps of photosynthesis.