The Nitrogen and Carbon Cycles

How much of the atmosphere is composed of nitrogen gas?

• 87%
• 38%
• 78%
• 21%

Based on this diagram, which of the following can you infer is the chemical formula for gaseous nitrogen?

• N
• N₂
• N₃
• N₄

Tags

NGSS.MS-PS1-1

Plants and animals cannot use nitrogen directly from the air.

• True

• False

Plants and animals need nitrogen to make __________.

• Proteins

• Carbohydrates

• Lipids

• Minerals

Tags

NGSS.MS-LS1-7

The conversion of ammonia (NH₃) to nitrite (NO_2-) and then to nitrates (NO_3-) is called

• Ammonification

• Nitrification

• Denitrification

• Assimilation

Tags

NGSS.MS-LS2-3

What is denitrification?

• Conversation of nitrite back to nitrogen gas

• Conversation of ammonia back to nitrogen gas

Tags

NGSS.MS-LS2-3

NGSS.MS-ESS2-1

All of the carbon in existence is continually recycled in the carbon cycle

• True

• False

Tags

NGSS.MS-LS2-3

NGSS.MS-ESS2-1

Which of the following removes carbon from the atmosphere?

• Combustion

• Respiration

• Photosynthesis

• Death

Tags

NGSS.MS-LS1-6

Organisms that do not decompose can be buried and become what?

• Water

• Nutrients

• Air

• Fossil fuels

Tags

NGSS.MS-LS2-3

NGSS.MS-ESS2-1

Which of the following creates a calcium carbonate structure?

• Plants

• Cows

• Corals

• Decomposers