Biogeochemical Cycles

What is the most abundant gas in the atmosphere?

• hydrogen
• oxygen
• helium
• nitrogen

Why do living things need nitrogen?

• To get energy
• To make amino acids
• To make proteins
• To make proteins AND amino acids

Where are denitrifying bacteria found?

• In the soil
• Root nodules
• In dead things
• In the atmosphere

Tags

NGSS.MS-LS2-3

What happens during the process of nitrogen-fixation?

• Nitrogen compounds turn into free nitrogen
• Free nitrogen turns into nitrogen compounds

Tags

NGSS.MS-ESS2-1

NGSS.MS-LS2-3

What is the only process that removes carbon from the atmosphere?

• combustion
• cellular respiration
• photosynthesis
• decomposition

Tags

NGSS.MS-LS1-6

Where is carbon stored in the environment?

• Fossil fuels
• Wood of trees
• Calcium carbonate (shells and bones)
• All of the above

Tags

NGSS.MS-ESS2-1

NGSS.MS-LS2-3

What is this a picture of?

• Nitrogen cycle
• carbon cycle
• water cycle
• plant cycle

Tags

NGSS.MS-ESS2-1

NGSS.MS-LS2-3

When nitrogen gas is turned in to a form that plants and animals can use is called 

• Combustion
• Photosynthesis
• Decomposition
• Nitrogen Fixation

Carbon dioxide is added to the atmosphere by

• Burning fossil fuels 
• Cellular respiration
• Decomposing organic matter
• All answers are correct

Tags

NGSS.MS-ESS3-4

If the atmosphere is 78% N₂, why can't we just get our nitrogen by breathing?

• We have no mechanism to break the triple bond of nitrogen between the atoms.
• Our lungs would be damaged by the N2.
• We need Oxygen for cellular respiration.
• The legumes take it up first.