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Biology
Bio topic 5
nitrogen cycle
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Cards (24)
Why is the nitrogen cycle important?
Animals and plants can't obtain nitrogen
gas
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What makes nitrogen gas inert?
It contains a
triple bond
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What do microorganisms do in the nitrogen cycle?
They break
nitrogen bonds
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How do plants absorb nitrogen?
Through
active transport
in the
roots
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Which biological molecules contain nitrogen?
Proteins
,
ATP
, and
nucleic acids
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What are the four key processes of the nitrogen cycle?
Nitrogen fixation
Ammonification
Nitrification
Denitrification
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What is ammonification?
Creation of
ammonium
from organic matter
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What is nitrogen fixation?
Converting
nitrogen gas
into nitrogen compounds
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Where does nitrogen fixation occur in plants?
In
root nodules
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Which plants have root nodules for nitrogen fixation?
Leguminous
plants
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What do nitrogen-fixing bacteria convert nitrogen gas into?
Ammonium
or
nitrates
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What is the process of nitrification?
Conversion of
ammonium
to
nitrites
and
nitrates
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What are the two stages of nitrification?
Ammonium
to
nitrites
, nitrites to
nitrates
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How do plants absorb nitrates?
By
active transport
from the soil
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What do animals produce that contains nitrogen?
Waste containing
ammonia
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What role do decomposers play in the nitrogen cycle?
They break down
proteins
into nitrogen compounds
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What is the result of the decomposition of dead plants and animals?
Release of
nitrogen-containing
compounds
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What is denitrification?
Conversion of
nitrates
back to
nitrogen gas
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Why is denitrification undesirable in agriculture?
It leads to loss of
nitrogen
from soil
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When does denitrification occur?
When soil is waterlogged and
anaerobic
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What is the oxidation process in nitrification?
Ammonium
to
nitrite
to nitrate
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What must be specified in exam questions about decomposers?
The
nitrogen-containing
compound involved
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What nitrogen-containing compound is found in animal urine?
Urea
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What nitrogen-containing compound is found in dead plant matter?
Proteins
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