Nitrogen Cycle

How do plants get the nitrogen they need?

• from the air

• from the soil or water in which they live

• from the Sun

• from broken-down rocks

What percent of gases in the atmosphere does nitrogen make up?

• 20%

• 9%

• 78%

• .3%

Tags

NGSS.MS-PS1-1

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

• Sun

• Rain

• Thunder

• Lighting

Animals obtain the nitrogen they need directly from the

• soil in their habitat

• air they breathe

• plants they eat

• bacteria living within them

The process where excess nutrients enter a body of water causing overgrowth of aquatic plants and algae...

• Eutrophication

• Acid Precipitation

• Nitrogen Fixation

• Decomposition

Organisms that need nitrogen to survive

• only plants

• only animals

• only bacteria

• all living organisms

Organisms that play a role in the nitrogen cycle

• only plants
• only animals
• only bacteria
• plants, animals, & bacteria

Tags

NGSS.MS-LS2-3

Plants and animals cannot use nitrogen directly from the air.

• True

• False

Process in which bacteria change nitrogen gas into ammonia

• nitrogen fixation

• ammonification

• nitrification

• denitrification

The 2 step process in which bacteria convert ammonia into nitrites and then nitrates so that plants can use it is called

• nitrogen fixation

• ammonification

• Nitrification

• Denitrification