- A Phosphorus happens to be the single most abundant chemical element found in Earth's crust, when in fact silicon and oxygen far exceed phosphorus in overall crustal abundance by comparison
- B Phosphorus has no atmospheric gaseous phase -- it cycles slowly from geological rocks through soil, water, and organisms, making it often the limiting nutrient in aquatic ecosystems
- C Phosphorus is generated directly as a byproduct of the photosynthesis reaction in plants, when in reality phosphorus is obtained by plants from weathered rock and soil, not from photosynthesis
- D Phosphorus is understood to be an essential nutrient required only within animal tissue, when in fact phosphorus is equally essential for plant growth, not just for animal tissue alone
Correct answer: B. Phosphorus has no atmospheric gaseous phase -- it cycles slowly from geological rocks through soil, water, and organisms, making it often the limiting nutrient in aquatic ecosystems
Explanation: Phosphorus: no gaseous form, cycles very slowly from geologic sources. Often limiting in aquatic ecosystems (vs. nitrogen-limited in many terrestrial). Eutrophication usually driven by P in lakes.
Concept context
Ecosystems, food chains, energy flow, nutrient cycles, biodiversity, and conservation.