Nitrogen Cycle

Roughly how much of the atmosphere is composed of nitrogen gas?

• 87%

• 38%

• 78%

• 21%

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

The swelling on the roots of a soybean are called

• Noodles
• Nitrogen
• Nodules
• Legumes

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 ammonium ions

• proteins into nitrates

Animals obtain the nitrogen they need directly from the

• soil in their habitat

• air they breathe

• plants and/or animals they eat

• bacteria living within them

Organisms require nitrogen to make which of the following?

• glucose and starch

• lipids and nucleic acids

• proteins and nucleic acids

• carbohydrates and proteins

Nitrogen fixation involves nitrogen from which of the following sources?

• lightning

• fertilizers

• dead plants

• atmosphere

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

Which group of bacteria convert ammonium ions to Nitrite and Nitrate ions?

• Denitrifying

• Nitrifying

• Nitrogen-fixing

Tags

NGSS.MS-LS2-3

Which group of bacteria convert nitrogen gas in to ammonium ions?

• Denitrifying

• Nitrifying

• Nitrogen-fixing

Which group of bacteria require aerobic conditions in order to oxidise nitrites to nitrates?

• Denitrifying

• Nitrifying

• Nitrogen-fixing

• Saprobiotic

Tags

NGSS.HS-LS2-3