Nitrogen Cycle

In addition to lightning, what are three other ways nitrogen enters the soil and is fixed into a usable form for organisms? (Select THREE answers)

• Fertilizers

• Decomposition of organic matter

• Bacteria fixation

• Denitrification

• Plant consumption

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NGSS.MS-LS2-3

Which of the following organisms are essential for the nitrogen cycle?

• Bacteria

• Plants

• Animals

• People

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NGSS.MS-LS2-3

Nitrogen-fixing bacteria are found in...

• root nodules of legumes

• plants

• animals

• decomposers

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NGSS.MS-LS2-3

What is the only form of nitrogen that non-legume plants can take in and use?

• Nitrates

• Nitrites

• Diatomic nitrogen

• Ammonium

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NGSS.MS-LS2-3

NGSS.MS-LS2-1

Which of the following best explains why nitrogen fixation (when bacteria in the soil change atmospheric nitrogen into nitrogen for plants & animals) must take place?

• Atmospheric nitrogen is unusable to plants and animals

• Nitrogen must be returned to the atmosphere

• Animals must breathe in nitrogen

• Nitrogen gets "stuck" in the soil and must be untrapped

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NGSS.MS-LS2-3

Decomposers that breaks down dead plants & animals and releases nitrogen back into atmosphere

• bacteria

• plants

• animals

• producers

When nitrogen gas is turned in to a form that plants and animals can use is called...

• Combustion

• Photosynthesis

• Decomposition

• Nitrogen Fixation

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NGSS.MS-LS2-3

Organisms need nitrogen in order to...

• To breathe

• To obtain water for growth

• To build proteins & DNA

• To regulate temperature

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NGSS.MS-LS2-1

The process by which waste and dead organisms release nitrogen back into the soil to be used again.

• Decomposition

• Fixation

• Denitrification

• Sublimation

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NGSS.MS-LS2-3

NGSS.MS-LS2-1

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

NGSS.MS-LS2-1