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

What % of the air is made of nitrogen?

• 21%

• 52%

• 61%

• 78%

True or False. The nitrogen in the atmosphere is in the right form for living things to use.

• True

• False

This can transform nitrogen in the atmosphere into a usable form of nitrogen

• rain

• ice

• lightning

• sun

What is the role of denitrifying bacteria

• change nitrate back into nitrogen gas

• change nitrogen gas into nitrate

• absorb carbon dioxide in the soil

• release oxygen gas into the atmosphere

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-1

The process in which nitrogen circulates and is recycled is called

• The nitrogen cycle

• The carbon cycle

• The water cycle

• The phosphorus cycle

Tags

NGSS.MS-LS2-3

Plants and animals need nitrogen to make __________.

• Protein

• DNA

• Lipids

• Minerals

Tags

NGSS.MS-LS2-3

How much of the atmosphere is composed of nitrogen gas?

• 87%
• 38%
• 78%
• 21%

How animals get the nitrogen they need

• from the air they breathe
• from the water they drink
• from the food they eat
• from the Sun

Organisms that need nitrogen to survive

• only plants
• only animals
• only bacteria
• all living organisms

Tags

NGSS.MS-LS2-1