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Nitrogen Cycle Flashcards | StudBud
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Nitrogen Cycle
Nitrogen Cycle
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Earth science review of the nitrogen cycle.
Flashcards
17 cards
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Practice quiz
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Questions
17
Answers
1
What is the main difference between denitrification and the other steps of the nitrogen cycle?
Bacteria are not involved in denitrification
Denitrification isn't necessary to complete the cycle.
Denitrification takes days, the others are instant
Denitrification changes nitrogen into a gaseous form
2
How much of the atmosphere is composed of nitrogen gas?
21%
38%
87%
78%
3
Animals obtain the nitrogen they need directly from the...
plants and animals they eat
bacteria living within them
air they breathe
soil in their habitat
4
How do our bodies absorb nitrogen?
By breathing
From the food we eat
By talking with friends
By listening to music.
5
Usable nitrogen has decreased in the soil in a local park. What could explain this problem?
Less lightning strikes
Decrease in bacteria in soil
Increase in biomass
Increase fertilizer usage
6
How do plants get the nitrogen they need?
From the air
From the sun
From broken-down rocks
From the soil or water in which they live
7
Organisms require nitrogen to make which of the following?
Carbs and nucleic acids
Glucose and starch
Proteins and nucleic acids
Proteins and lipids
8
Plants and animals have nitrogen in them. What process puts nitrogen back into the biosphere?
Condensation
Decomposition
Bacteria
Precipitation
9
Organisms that break down dead plants and animals and release nitrogen back into the atmosphere
Bacteria
Animals
People
Plants
10
Organisms that need nitrogen to survive
only bacteria
only plants
all living organisms
only animals
11
______ is the process where nitrogen is converted so the plants can have a usable form.
Fixation
Denitrification
Consumption
Nitrification
12
Nitrogen-rich fertilizers and manure can cause water pollution.
False
True
13
Nitrogen fixation takes nitrogen from which of the following sources?
Lightning
Dead plants
The atmosphere
Fertilizers
14
The process in which nitrogen circulates and is recycled is called ____.
The Water Cycle
The Nitrogen Cycle
The Phosphorous Cycle
The Carbon Cycle
15
What is the process to make nitrogen into usable forms like nitrate?
Assimilation
Nitrification
Nitrogen composition
Denitrification
16
How is nitrogen "fixed" into usable form for plants?
Through photosynthesis.
Through lightning only.
Through the action of bacteria only.
Through the action of bacteria and lightning.
17
Plants and animals cannot use nitrogen directly from the air.
False
True
