nitrogen cycle Flashcards

1
Q

what is nitrogen needed for

A

making proteins for growth

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2
Q

how do plants get nitrogen

A

nitrates from soil

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3
Q

how do animals get nitrogen

A

eating plants or each other

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4
Q

nitrogen fixating bacteria

A

turning N2 from the air into nitrates in soil

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5
Q

lightning

A

energy makes nitrogen react with oxygen to get nitrates in soil

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6
Q

decomposition

A

proteins and urea into ammonium ions in the soil

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7
Q

nitrifying bacteria

A

amonium ions in decaying matter into nitrites then nitrates

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8
Q

denitrifying bacteria

A

turns nitrates back into N2 in air

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