bacteria in nitrogen cycle Flashcards

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1
Q

the four processes of the nitrogen cycle

A

decomposition, nitrification, denitrification and nitrogen fixation

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2
Q

the bacteria involved in decomposition

A

decomposing bacteria

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3
Q

the bacteria involved in nitrification

A

nitrifying bacteria

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4
Q

the bacteria involved in denitrification

A

denitrifying bacteria

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5
Q

the bacteria involved in nitrogen fixation

A

nitrogen-fixing bacteria
(found in soil and root nodules of plants)

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6
Q

description of decomposition

A

protein in dead plants and animals is broken down
ammonia is released into the soil

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7
Q

description of nitrification

A

ammonia is converted to nitrites,
and nitrites are converted into nitrates

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8
Q

description of denitrification

A

nitrates are converted to nitrogen gas (denitrification reduces the amount of nitrate in the soil and therefore makes the soil less fertile)

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9
Q

description of nitrogen fixation

A

nitrogen gas is converted to ammonia in bacteria which is used to make proteins, when the bacteria die their proteins decompose, releasing ammonia back into the soil

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10
Q

some nitrogen fixing bacteria live small structures -

A

nodules on the roots of legume plants

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11
Q

in the nodules there is a mutualistic relationship because

A

the bacteria receive glucose from the plant while the plant absorbs ammonia from the bacteria in the nodule

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12
Q

when the bacteria decompose they make the soil much

A

much more fertile releasing ammonia which can be converted into nitrates

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