The Nitrogen Cycle

Photosynthesis

• absorbs CO2
• releases CO2

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-6

Respiration

• absorbs CO2
• releases CO2

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

NGSS.HS-LS2-5

What percent of the atmosphere is compose of Nitrogen?

• 18%

• 8%

• 78%

• 70%

Why do all organisms need nitrogen?

• To build protein and DNA

• To build phosphorus

• To make oxygen levels grow

• To help blood circulate better

What is the correct order for the stages of the nitrogen cycle?

• Denitrification, Nitrogen Fixing, Nitrification

• Nitrification, Denitrification, Nitrogen Fixing

• Nitrogen Fixing, Nitrification, Denitrification

• Nitrification, Nitrogen Fixing, Denitrification

Tags

NGSS.MS-LS2-3

Which of the following describes the role of nitrogen-fixing bacteria in the nitrogen cycle? Nitrogen-fixing bacteria convert

• nitrates intro nitrogen gas
• ammonia into proteins
• nitrogen gas into ammonia
• proteins into nitrates

Tags

NGSS.MS-LS2-3

What converts some atmospheric nitrogen into nitrates that organisms 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

Tags

NGSS.5-LS2-1

Nitrogen is the most plentiful gas in the atmosphere.

• True
• False

Plants and animals cannot use nitrogen directly from the air.

• True
• False

Tags

NGSS.MS-LS2-1