Q.1
This can transform nitrogen in the atmosphere into a usable form of nitrogen
  • rain
  • ice
  • lightning
  • sun
Q.2
The process in which nitrogen circulates and is recycled is called
  • The nitrogen cycle
  • The carbon cycle
  • The water cycle
  • The phosphorus cycle
Q.3
_____ is the conversion of organic nitrogen into ammonia
  • Nitrogen Fixation
  • Ammonification
  • Denitrification
  • Assimilation
Q.4
Majority of nitrogen fixation occurs by
  • Biological nitrogen fixing organisms
  • Lightning
  • volcanic eruptions
  • Haber–Bosch process
Q.5
How nitrogen is "fixed" into useable form for plants...
  • through action of bacteria only
  • through lightning only
  • through action of bacteria & lightning
  • through photosynthesis
Q.6
We need nitrogen to make
  • proteins
  • enzymes
  • cells
  • all of these
Q.7
What is the role of decomposing bacteria in the nitrogen cycle?
  • change Nitrogen gas into Nitrate
  • Return the nitrogen compounds to the soil
  • Turn nitrogen into water
  • Turn nitrate into nitrogen gas
Q.8
True or False. The nitrogen in the atmosphere is in the right form for living things to use.
  • True
  • False
Q.9
What % of the air is made of nitrogen?
  • 21%
  • 52%
  • 61%
  • 78%
Q.10
If the atmosphere isNwhy can't we just get our nitrogen by breathing?
  • We have no mechanism to break the triple bond of nitrogen between the atoms.
  • Our lungs would be damaged by the N2.
  • We need Oxygen for cellular respiration.
  • The legumes take it up first.
Q.11
After plants and animals contain nitrogen, what puts it back into atmosphere and soil?
  • decomposition
  • precipitation
  • condensation
  • bacteria
Q.12
All plants have nitrogen fixing bacteria in their roots.
  • True
  • False
Q.13
Bacteria create a form of nitrogen that animals can use directly.
  • True
  • False
Q.14
What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?
  • Assimilation
  • Fixation
  • Ammonification
  • Denitrification
Q.15
The process that allows organisms to use nitrogen
  • assimilation
  • denitrification
  • fixation
  • ammonification
Q.16
What converts nitrogen gas into a usable form for plants and animals?
  • bacteria
  • rain
  • fungi
  • car exhaust
Q.17
How is nitrogen "fixed" into a usable form for plants?
  • Through action of bacteria only
  • Through lightning only
  • Through action of bacteria and lightning
  • Through photosynthesis
Q.18
Nitrification happens in the ______
  • Air
  • Soil
  • Ground Water
  • Plants
Q.19
Organisms that play a role in the nitrogen cycle
  • only plants
  • only animals
  • only bacteria
  • plants, animals, & bacteria
Q.20
Plants and animals cannot use nitrogen directly from the air.
  • True
  • False
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