Nitrogen cycle

How much of the atmosphere is composed of nitrogen gas?

• 87%
• 38%
• 78%
• 21%

Tags

NGSS.MS-PS1-1

Organisms that need nitrogen to survive

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

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

If the atmosphere is 78% N₂, why can't we just get our nitrogen by breathing?

• We have no mechanism to break the triple bond of nitrogen between the atoms.

• Our lungs would be damaged by the N₂.

• We need Oxygen for cellular respiration.

• The legumes take it up first.

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

• decomposition
• precipitation
• condensation
• bacteria

Tags

NGSS.MS-LS2-3

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-ESS2-1

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

Tags

NGSS.MS-LS2-3

What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?

• Assimilation

• Fixation

• Ammonification

• Denitrification

Tags

NGSS.MS-LS2-3

Plants and animals need nitrogen to make __________.

• Protein

• Carbohydrates

• Lipids

• Minerals