The Nitrogen Cycle

Poll

Do Now: Where do you think most of the nitrogen on Earth is stored?

• In plants and animals

• In the soil

• In the ocean

• In the atmosphere

​If there's so much nitrogen in the atmosphere, why can't plants and animals just use it directly?

Multiple Choice

Nitrogen gas makes up what percentage of our atmosphere?

• 78%
• 50%
• 21%

Multiple Choice

Nitrogen is an essential component of amino acids. True or False?

• False
• True

Fill in the Blanks

describes how nitrogen moves between the soil, plants, animals, bacteria and the atmosphere.

Multiple Choice

Why is the nitrogen cycle important?

• The nitrogen cycle is important because it recycles nitrogen, and it helps maintain productive and healthy ecosystems.

• The nitrogen cycle is important because it helps in the formation of fossil fuels.

• The nitrogen cycle is important for producing oxygen in the atmosphere.

Multiple Choice

Certain bacteria convert nitrogen gas into ammonia through a process called

• nitrogen reduction
• ammonia synthesis
• nitrogen fixation

Multiple Choice

Ammonia converts to nitrates through a process called

• ammonification

• nitrification

• denitrification

Multiple Choice

Animals get nitrogen by eating plants. True or False?

• True

• False

Multiple Choice

Nitrogen is broken down into ammonia with the help of decomposers through a process called

• nitrogen assimilation
• ammonification
• nitrogen fixation

Multiple Choice

Soil bacteria converts nitrates into nitrogen gas through a process called

• denitrification
• ammonification
• nitrification

Open Ended

What are the 5 stages of the nitrogen cycle?

Open Ended

Exit Ticket: What is one negative human impact on the nitrogen cycle? Answer in complete sentences!