Nitrogen Cycle

How much of the atmosphere is composed of nitrogen gas?

• 87%
• 38%
• 78%
• 21%

Tags

NGSS.MS-PS1-1

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

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

Why do all organisms need nitrogen?

• To live and grow 
• To build phosphorus
• To make oxygen levels grow
• To help blood circulate better

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-3

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

• protein into gas

• water into gas

• nitrogen gas into nitrogen that can be used by plants

• soil to gas

Animals obtain the nitrogen they need directly from the

• soil in their habitat
• air they breathe
• plants they eat
• bacteria living within them

What is the First Stage of the Nitrogen Cycle?

• Carbon in the Ocean
• Nitrogen Fixing Bacteria
• Who Cares
• Nitrogen in the Atmosphere

What Percent of the Atmosphere is Nitrogen?

• 82%
• 62%
• 23%
• 78%

What is the Nitrogen Cycle?

• The  Cycle where Nitrogen is turned into Various Chemicals
• The Cycle where Nirtogen gas turns into a Liquid then a Solid
• The Cycle where Nitrogen is turned into Bacteria and Chemicals
• Oppisite of Answer 2

Peas and beans are examples of these. 

• flowers
• grass 
• legumes
• soil 

Where is most nitrogen stored the most? 

• the ocean 
• in plants
• in the atmosphere 
• bacteria