- A A significant, well-defined soil-based component present within the overall cycle
- B Atmospheric (gaseous) phase -- phosphorus does not enter the atmosphere as a gas
- C A significant, well-defined oceanic phase present within the overall global cycle
- D Any meaningful biological uptake of phosphorus by living organisms each season
Correct answer: B. Atmospheric (gaseous) phase -- phosphorus does not enter the atmosphere as a gas
Explanation: Unlike carbon and nitrogen cycles, the phosphorus cycle has no gaseous phase. Phosphorus moves from rocks to soil to water to organisms and back.
Concept context
Levels of biodiversity, species richness patterns, threats (HIPPO), and conservation strategies. Always in NEET.