Nitrogen Cycle

The conversion of atmospheric nitrogen into ammonia, a form of nitrogen plants can readily use, is called -

• denitrification.

• ammonification.

• nitrogen fixation.

• nitrification.

To obtain the nitrogen they need, animals depend on many different microscopic ____________________ to convert nitrogen at all stages of the nitrogen cycle.

• protozoa

• bacteria

• worms

• insects

Tags

NGSS.MS-LS2-3

The atmosphere is made up of mostly nitrogen. The percentage of nitrogen in the atmosphere is approximately _____.

• 60%

• 78%

• 83%

• 51%

Decomposers make ammonium in the soil during the process of -

• nitridication.

• nitrogen fixation.

• denitrification.

• ammonification.

Tags

NGSS.MS-LS2-3

____________________ converts ammonia and ammonium into nitrite and nitrate.

Tags

NGSS.MS-LS2-3

Select all answers below that are stages of the nitrogen cycle.

• Nitrogen fixation

• Diffusion

• Ammonification

• Nitrification

Tags

NGSS.MS-ESS2-1

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

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-LS2-1

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

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