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Phosphorus cycle - Quiz
Phosphorus cycle
  • 1. Which sphere does not play a significant role in the phosphorus cycle?
A) Hydrosphere
B) Lithosphere
C) Atmosphere
D) Biosphere
  • 2. What is the most common form of phosphorus found in the environment?
A) Phosphorus gas
B) Phosphine
C) Orthophosphate
D) Pure phosphorus
  • 3. Which of these is a vital biological component that requires phosphorus?
A) DNA
B) Carbon dioxide
C) Glucose
D) Sodium
  • 4. What compound is a key component of animal bones and teeth?
A) Quartz
B) Orthoclase
C) Calcite
D) Apatite
  • 5. What is the primary driver of the long-term global phosphorus cycle?
A) Solar radiation
B) Animal migration
C) Atmospheric pressure
D) Tectonic movement
  • 6. What phenomenon occurs when phosphorus causes over-production in aquatic ecosystems?
A) Acidification
B) Desertification
C) Salinization
D) Eutrophication
  • 7. Which human activity is identified as a major cause of changes to the phosphorus cycle?
A) Mining
B) Overfishing
C) Deforestation
D) Urbanization
  • 8. What is generally the limiting nutrient in aquatic ecosystems?
A) Phosphorus
B) Hydrogen
C) Oxygen
D) Carbon
  • 9. Where does the phosphorus needed for cell membranes (phospholipids) come from?
A) It is absorbed through skin
B) It is absorbed from the air
C) It is synthesized by animals
D) Plants assimilate it as phosphate
  • 10. Why does phosphorus availability in soil decrease over thousands of years?
A) Excessive plant growth
B) Chemical evaporation
C) Microbial overconsumption
D) Loss through runoff
  • 11. What is the primary cause of saltwater algal blooms?
A) Excess phosphorus
B) Excess oxygen
C) Excess carbon
D) Excess nitrogen
  • 12. How is phosphorus primarily released from rocks and minerals?
A) Volcanic activity
B) Photosynthesis
C) Biological decay
D) Weathering
  • 13. What substance is often the source of phosphorus-rich deposits?
A) Peat
B) Guano
C) Petroleum
D) Coal
  • 14. What role do soil microorganisms play in the phosphorus cycle?
A) They act as both sinks and sources
B) They create phosphorus from air
C) They destroy all phosphorus
D) They have no effect
  • 15. What happens to most phosphorus in the soil over a long period?
A) It transforms into insoluble compounds
B) It turns into a gas
C) It becomes highly soluble
D) It disappears completely
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