Nitrogen Cycle

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

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

Bacteria fix nitrogen from the atmosphere into a form plants can use.

• True

• False

Tags

NGSS.MS-LS2-3

What do free living bacteria in the soil do?

• Make clouds

• Turn atmospheric nitrogen into nitrates

• Make carbon dioxide for plants to go through photosynthesis

• Help plants take in water

Tags

NGSS.MS-LS2-3

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

• nitrogen composition

• nitrogen fixation

• ammonia

• denitrification

What is the main difference between denitrification and the other three steps of the nitrogen cycle?

• Bacteria are not involved in the process of denitrification

• Denitrification changes nitrogen into a gaseous form

• Denitrification takes days; the other steps are instant

• Denitrification isn't necessary to complete the 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

Organisms that convert fixed nitrogen back into nitrogen gas and release nitrogen gas back into atmosphere...

•  denitrifying bacteria

• fungi

• maggots 

• all of the above

Tags

NGSS.MS-LS2-3

The constant movement of nitrogen through the biotic & abiotic parts of an ecosystem is known as the ______.

• water cycle

• nitrogen cycle

• carbon cycle

• life cycle

Tags

NGSS.MS-LS2-3

What role do legumes play in the nitrogen cycle?

• They release nitrogen gas into the atmosphere

• They fix nitrogen into the soil through symbiotic bacteria

• They decompose organic matter

• They absorb nitrogen from the air