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Search Results for oxygen - All Grades

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Grade 7 Earth's Layers
Where is most of the earth's oxygen found?
  1. crust
  2. atmosphere
  3. water
  4. plants
Grade 7 Atmosphere
How is the ozone layer helpful?
  1. needed for cellular respiration
  2. protects earth from radiation
  3. used during combustion
  4. forms organic molecules
Grade 7 Atmosphere
Through which process is oxygen released into the atmosphere?
  1. combustion
  2. condensation
  3. photosynthesis
  4. nitrification
Grade 9 Environmental Science
                is the burning of fossil fuels.
  1. compaction
  2. condensation
  3. combustion
  4. carbon dioxide
Grade 7 Biochemical Pathways
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 5 Respiration, Digestion, and Excretion
Grade 6 Periodic Table and Elements
Grade 8 Periodic Table and Elements

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Grade 4 Periodic Table and Elements
Grade 9 Periodic Table and Elements
Grade 9 Biochemical Pathways
Oxygen is released                                      .
  1. after water is split in photosystem II
  2. during the electron transport chain
  3. during the Calvin Cycle
  4. by chlorophyll
Grade 6 Periodic Table and Elements
Oxygen is a metal.
  1. True
  2. False
Grade 9 Circulatory and Immune Systems
Grade 8 Molecules and Compounds
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