Nitrogen and Oxygen Cycles

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

• nitrogen composition
• ammonia 
• nitrogen fixation
• denitrification

How much of the atmosphere is composed of nitrogen gas?

• 87%
• 38%
• 78%
• 21%

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

• bacteria
• plants
• animals
• producers

Tags

NGSS.MS-LS2-3

Organisms that need nitrogen to survive

• only plants
• only animals
• only bacteria
• all living organisms

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-1

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

• decomposition
• precipitation
• condensation
• bacteria

Tags

NGSS.MS-LS2-3

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

• N
• N₂
• N₃
• N₄

Tags

NGSS.MS-PS1-1

The process in which Nitrogen circulates and is recycled is called ____________

• The nitrogen cycle
• The water cycle
• The carbon cycle
• Nitrogen Fixation 

Tags

NGSS.MS-LS2-3

_____ is the conversion of organic nitrogen into ammonia

• Nitrogen Fixation
• Ammonification
• Denitrification
• Assimilation 

Nitrification happens in the ______

• Air 
• Soil 
• Ground Water 
• Plants 

Tags

NGSS.MS-LS2-3

What converts nitrogen gas into a usable form for plants and animals?

• bacteria

• rain

• fungi

• car exhaust