Nitrogen Cycle Practice

Which nitrogen cycle process is occurring when bacteria convert ammonium to nitrite and then into nitrate?

• nitrogen fixation

• nitrification

• denitrification

• ammonification

• assimilation

Which of these nitrogen cycle processes converts atmospheric nitrogen to a soil form of nitrogen that is usable by plants?

• nitrogen fixation

• nitrification

• denitrification

• ammonification

• assimilation

Nitrification happens in the ______

• Air 
• Soil 
• Ground Water 
• Plants 

Which nitrogen cycle process is occurring when bacteria convert ammonium to nitrite and then into nitrate?

• nitrogen fixation

• nitrification

• denitrification

• ammonification

• assimilation

Which of these nitrogen cycle processes converts atmospheric nitrogen to a soil form of nitrogen that is usable by plants?

• nitrogen fixation

• nitrification

• denitrification

• ammonification

• assimilation

Decomposers make ammonium in the soil during the process of -

• nitridication.

• nitrogen fixation.

• denitrification.

• ammonification.

____________________ converts ammonia and ammonium into nitrite and nitrate.

Ammonia and ammonium are compounds of -

• nitrogen and hydrogen.

• nitrogen and oxygen.

• hydrogen and oxygen.

• oxygen and chlorine.

Select all answers below that are stages of the nitrogen cycle.

• Nitrogen fixation

• Diffusion

• Ammonification

• Nitrification

The relationship between some plants and nitrogen-fixing bacteria is -

• predator-prey.

• parasitic.

• mutualistic.

• commensal.