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

How much of the atmosphere is composed of nitrogen gas?

• 87%
• 38%
• 78%
• 21%

Plants and animals cannot use nitrogen directly from the air.

• True
• False

Tags

NGSS.MS-LS2-1

_____ is the conversion of organic nitrogen into ammonia

• Nitrogen Fixation
• Ammonification
• Denitrification
• Assimilation 

How is nitrogen "fixed" into a usable form for plants?

• Through action of bacteria only

• Through lightning only

• Through action of bacteria and lightning

• Through photosynthesis

Tags

NGSS.MS-LS2-3

How do animals get the nitrogen they need?

• From the air they breathe

• From the water they drink

• From the food they eat

• From the sun

Tags

NGSS.MS-LS2-3

According to this diagram, plants use nitrogen to make _________________________

• bacteria

• animals

• proteins

• decomposers

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-1

According to this diagram, plants absorb

• nitrates

• nitrogen fixing bacteria

• animals

• decomposers

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-1

According to this diagram, animals get proteins from eating ________________________

• decomposers

• bacteria

• plants

• sunlight

Tags

NGSS.HS-LS1-6

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

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4