The Nitrogen Cycle 2

What is the process called where nitrogen gas (N2) is converted into ammonia (NH3) by bacteria?

• Nitrification

• Denitrification

• Nitrogen Fixation

• Ammonification

Which form of nitrogen is absorbed by plants during the nitrogen cycle? (Select all that apply)

• Nitrogen gas (N2)

• Ammonia (NH3)

• Nitrogen dioxide (NO2)

• Nitrate (NO3)

What is the process called where nitrates (NO3-) are converted back into nitrogen gas (N2)?

• Nitrification

• Denitrification

• Assimilation

• Ammonification

Where have we seen nitrogen before?

• In the ocean

• In the atmosphere

• In rocks

• In metals

What has to happen to nitrogen before our bodies can use it?

• It must be frozen

• It must be liquefied

• It must be "fixed"

• It must be evaporated

What is the nitrogen cycle?

• A process where nitrogen is created in the atmosphere

• A continuous process where nitrogen moves through the environment

• A cycle that only involves water and soil

• A process that converts oxygen into nitrogen

Why is the nitrogen cycle important?

• It provides oxygen for breathing

• It helps in the formation of rocks

• It is essential for life on Earth

• It converts nitrogen into gold

What does the nitrogen cycle involve?

• Only the atmosphere

• Only water and soil

• Organisms, soil, water, and atmosphere

• Only plants and animals

What is nitrogen needed for in our bodies?

• Carbohydrates and lipids

• Amino acids and proteins, DNA, and RNA

• Vitamins and minerals

• Water and oxygen

Why is gaseous nitrogen in the atmosphere difficult to break down?

• It has a single bond that is weak.

• It has a double bond that is strong.

• It has a triple bond that is hard to break apart.

• It has no bonds, making it unstable.