Nitrogen cycle

Nitrogen that is not combined with other elements and found in the atmosphere as gas is _____.

• free nitrogen
• nitrogen compounds
• ammonia
• nitrates

The type of nitrogen that can be used by producers is called _____.

• free nitrogen
• nitrous oxide
• nitrogen gas
• nitrogen compounds

Where are denitrifying bacteria found?

• In the soil
• Root nodules
• In dead things
• In the atmosphere

Tags

NGSS.MS-LS2-3

What happens during the process of nitrogen-fixation?

• Nitrogen compounds turn into free nitrogen
• Free nitrogen turns into nitrogen compounds

Tags

NGSS.MS-LS2-3

What happens during the process of denitrification?

• Nitrogen compounds turn into free nitrogen
• Free nitrogen turns into nitrogen compounds

Tags

NGSS.MS-LS2-3

Which is NOT a way that nitrogen compounds are added to the soil?

• Decay of dead organisms
• Denitrification
• Animal waste
• Nitrogen-fixation

Tags

NGSS.MS-LS2-3

What is the only process that removes carbon from the atmosphere?

• combustion
• cellular respiration
• photosynthesis
• decomposition

Tags

NGSS.MS-LS1-6

What converts some atmospheric nitrogen into nitrates that organisms can use?

• Sun

• Rain

• Thunder

• Lightening

Tags

NGSS.MS-LS2-3

Plants and animals cannot use nitrogen directly from the air.

• True
• False

What converts nitrogen into a useable form for plants and animals?

• bacteria
• fungi
• rain