Nitrogen Cycle Review

The majority of nitrogen is found in the...

• oceans

• atmosphere

• soil

Nitrogen makes up _____ of the atmosphere.

• 50%

• 87%

• 78%

Nitrogen is used to produce...(choose the best answer)

• DNA

• proteins

• both DNA & proteins

Tags

NGSS.MS-LS3-1

Free nitrogen is converted into a usable form through this process...

• nitrification

• nitrogen fixation

• denitrification

The majority of nitrogen fixation happens when _____ convert atmospheric nitrogen (N₂) into ammonia (NH₂)

• fungi

• plants

• bacteria

Tags

NGSS.MS-LS2-3

Ammonia is toxic to plants. The ammonia must be converted into a more useful form by ___ in the soil.

• worms

• fungi

• bacteria

Tags

NGSS.MS-LS2-3

The process by which bacteria convert ammonia into nitrates for plants to uptake...

• nitrification

• nitrogen fixation

• denitrification

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-1

When a plant or animal dies, decomposers convert the nitrogen back into...

• ammonium

• nitrates

• nitrites

Tags

NGSS.MS-LS2-3

Which process is responsible for converting nitrates back into nitrogen gas?

• nitrification

• denitrification

• ammonification

Tags

NGSS.MS-LS2-3

What is the primary role of legumes in the nitrogen cycle?

• to fix nitrogen

• to release nitrogen

• to store nitrogen