Biogeochemical Cycles

Bacteria fix nitrogen on plant roots. Plant roots provide sugar to bacteria. This is an example of

• mutualism
• parasitism
• commensalism
• competition

Tags

NGSS.MS-LS2-2

Nitrogen rich fertilizers and manure can cause water pollution.

• True
• False

Tags

NGSS.HS-LS2-7

All plants have nitrogen fixing nodules on their roots.

• True
• False

Organism that breaks down dead plants & animals and releases nitrogen back into atmosphere

• bacteria
• plants
• animals
• producers

Tags

NGSS.MS-LS2-3

How much of the atmosphere is composed of nitrogen gas?

• 87%
• 38%
• 78%
• 21%

Tags

NGSS.MS-PS1-1

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.

Tags

NGSS.MS-LS1-7

Nitrifying bacteria convert

• NH4+ into NO2 then NO3
• NH4+ into N2
• NO3 into NO2
• Nothing into nothing

Wastes such as dead leaves, scat (poop) and dead organisms that contain nitrogen are broken down by decomposers into 

• NH4+
• N2
• NO3
• NO2

Which is NOT a way that nitrogen compounds are added to the soil?

• Decay of dead organisms
• Denitrification
• Animal waste
• Nitrogen-fixation

Tags

NGSS.MS-LS2-3

Growing legumes such as alfalfa or soy beans increases

• denitrification
• nitrogen fixation
• ammonification
• ammonium oxidation

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4