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Seventh Grade (Grade 7) Biogeochemical Cycles Questions

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Grade 7 Biogeochemical Cycles
Lightning, legumes, and bacteria are a part of the                 .
  1. water cycle
  2. nitrogen cycle
  3. carbon cycle
  4. phosphorus cycle
Grade 7 Biogeochemical Cycles
Which process is NOT a way that carbon in dead organisms is returned to the carbon cycle?
  1. becoming fossil fuel
  2. combustion
  3. decomposition
  4. photosynthesis
Grade 7 Biogeochemical Cycles
Which two cycles depend on photosynthesis for part of the recycling process?
  1. carbon and oxygen
  2. water and nitrogen
  3. water and oxygen
  4. carbon and nitrogen
Grade 7 Biogeochemical Cycles
Through which process do living organisms release carbon into the atmosphere?
  1. photosynthesis
  2. cellular respiration
  3. transpiration
  4. combustion
Grade 7 Biogeochemical Cycles
Which is NOT a way that carbon cycles through the biosphere?
  1. photosynthesis
  2. transpiration
  3. combustion of fossil fuels
  4. decomposition
Grade 7 Biogeochemical Cycles
How does carbon dioxide in the atmosphere enter into living organisms?
  1. burning of forests
  2. combustion of fossil fuels
  3. photosynthesis
  4. transpiration
Grade 7 Biogeochemical Cycles
What is the role of decomposers in the nitrogen cycle?
  1. They release nitrogen gas into the atmosphere.
  2. They release nitrogen during cellular respiration.
  3. They use ammonia when they break down dead organisms.
  4. They release nitrogen into the soil when they break down dead organisms.
Grade 7 Biogeochemical Cycles
Lightning and soil bacteria are both involved in the production of                  .
  1. nitrates
  2. potassium
  3. phosphates
  4. none of the above
Grade 7 Biogeochemical Cycles
Which type of organisms carries out most nitrogen fixation?
  1. insects
  2. plants
  3. bacteria
  4. mammals
Grade 7 Biogeochemical Cycles
What organisms are involved in nitrogen fixation?
  1. bacteria in soil
  2. some types of plants
  3. parasites in soil
  4. autotrophs
Grade 7 Biogeochemical Cycles
Which process do some bacteria use to convert nitrogen gas in the air to ammonia?
  1. decomposition
  2. excretion
  3. denitrification
  4. nitrogen fixation
Grade 7 Biogeochemical Cycles
Which process converts nitrogen into ammonia?
  1. denitrification
  2. nitrogen fixation
  3. nitrogen conversion
  4. ammonia synthesis
Grade 7 Biogeochemical Cycles
Before plants can use ammonia for nitrogen, it must be changed into which form(s)?
  1. nitrogen gas and nitrates
  2. nitrogen gas and nitrites
  3. nitrates and nitrites
  4. amino acids and nitrogen gas
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