Nitrogen Cycle

Organisms that break down dead plants & animals and release nitrogen back into atmosphere...

• bacteria
• plants
• animals
• producers

Organisms that need nitrogen to survive

• only plants

• only animals

• only bacteria

• all living organisms

Plants and animals cannot use nitrogen directly from the air.

• True

• False

After plants and animals contain nitrogen, what puts it back into atmosphere and soil?

• decomposition

• precipitation

• condensation

• bacteria

Based on this diagram, which of the following can you infer is the chemical formula for gaseous nitrogen?

• N
• N₂
• N₃
• N₄

What happens when organisms die and decay?

• Their bodies are lifted up

• Their nitrogen returns to the soil

• they keep their nitrogen

• They stay on earth forever

_____ is the conversion of organic nitrogen into ammonia

• Nitrogen Fixation

• Ammonification

• Denitrification

• Assimilation

According to this diagram, plants use nitrogen to make _________________________

• bacteria

• animals

• proteins

• decomposers

According to this diagram, animals get proteins from eating ________________________

• decomposers

• bacteria

• plants

• sunlight

A correct path that nitrogen could take would be

• air -> animals -> plants -> bacteria

• animals -> air -> bacteria -> plants

• bacteria -> air -> plants -> animals

• air -> bacteria -> plants -> animals