Nitrogen cycle

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

• nitrogen composition
• ammonia 
• nitrogen fixation
• denitrification

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

• nitrogen composition
• ammonia 
• nitrogen fixation
• denitrification

According to this diagram, plants absorb ______________

• nitrates

• animals

• nitrogen fixing bacteria

• decomposers

Both plants and animals use nitrogen to make _________ and __________

• nitrates and lightning

• proteins and DNA

• water and air

• gas and liquids

True or False: Bacteria fix nitrogen from the atmosphere into a form plants can use

• True

• False

True or False:

Bacteria release nitrogen from dead organisms into the soil

• True

• False

Gas that makes up 78% of our atmosphere.

• Oxygen

• Nitrogen

• Hydrogen

• Carbon Dioxide

According to this diagram, plants use nitrogen to make _________________________

• bacteria

• animals

• proteins

• decomposers

_____ is the conversion of organic nitrogen into ammonia

• Nitrogen Fixation

• Ammonification

• Denitrification

• Assimilation

The process that convert nitrates (NO3-) back to nitrogen gas (N2) there by replenishing N2 in the atmosphere is called

• Nitrogen fixation

• Deamination

• Denitrification

• Nitrification