Cycles Flashcards

1
Q

nitrogen fixation

A

because atmospheric N2 cannot be used directly by plants it must first be converted into ammonia (NH3) by bacteria (rhizobium)

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2
Q

ammonification

A

decomposers convert organic waste into ammonia

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3
Q

nitrification

A

ammonia (NH3) is converted to nitrate ions (NO3-)

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4
Q

assimilation

A

inorganic nitrogen is converted into organic molecules such as DNA/amino acids and proteins

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5
Q

denitrification

A

bacteria convert nitrate (NO3-) and nitrite (NO2-) back into N2 gas

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6
Q

phosphorus does not circulate as easily as nitrogen because

A

it does not exist as a gas, but is released by weathering of phosphate [PO4(3-)]n rocks

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7
Q

how excess phosphorus is added back to aquatic ecosystems

A

runoff of animal wastes, fertilizer, discharge of sewage

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8
Q

largest reservoirs of C

A

carbonate [CO3(2-)] rocks first, oceans second

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