Nitrogen Cycle Question Preview (ID: 60745)
Denitirification, Assimilation, Nitrogen Fixation, Nitrification.
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What occurs during denitrification?
a) Plants absorb nitrogen gas from the atmosphere.
b) Decomposers convert nitrogen to a usable form.
c) Animals eat nitrogen.
d) Bacteria return nitrogen to gas form.
Which process removes nitrogen from the atmosphere?
a) denitrification
b) nitrogen fixation
c) cellular respiration
d) combustion
How do animals get the carbon and nitrogen they need?
a) breathing
b) eating
c) from the ground
d) from decomposition
This process occurs when bacteria convert ammonia in the soil into nitrates which plants can absorb.
a) nitrogen fixation
b) photosynthesis
c) nitrification
d) assimilation
Plants absorb usable nitrogen from the soil through the process of
a) assimilation
b) burning fossil fuels
c) nitrification
d) deforestation
Nitrogen is needed to make which important macromolecules?
a) proteins and lipids
b) all macromolecules
c) carbohydrates, proteins, and nucleic acids
d) nucleic acids and proteins
Our atmosphere is mostly made up of
a) oxygen
b) nitrogen
c) carbon dioxide
d) water vapor
Organisms cannot use nitrogen when it is in the
a) water
b) soil
c) atmosphere
d) plants
What is the cause of eutrophication?
a) burning fossil fuels
b) fertilizers running off into nearby bodies of water
c) acid rain
d) global warming
Which are key organisms in the nitrogen cycle?
a) sun
b) heterotrophs
c) producers
d) bacteria
When fossil fuels are burned, excess nitrogen is in the atmosphere. This causes
a) smog
b) global warming
c) climate change
d) more intense hurricanes
There is nitrogen on an organism's waste and dead organisms. _________ break them down during denitrification.
a) autotrophs
b) decomposers
c) animals
d) abiotic factors
Bacteria in the root nodules of legumes like peas and beans ______ the process of nitrogen fixation
a) control
b) damage
c) prevent
d) help
What has to happen to nitrogen before it can be used
a) Bacteria must convert it
b) Plants must absorb it
c) Decomposers must break it down
d) Animals must eat it
How do humans affect the nitrogen cycle?
a) polluting the land, water, and air
b) burning fossil fuels and using fertilizers
c) introducing invasive species
d) deforestation and combustion
What is the first thing that happens when too much nitrogen finds its way to a body of water like a pond or lake?
a) oxygen levels in the water drop
b) organisms die
c) algae grow too much
d) plants can't do photosynthesis
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