[Campbell Biology P.1230] In tropical areas of the oceanic pelagic zone, nutrient concentrati... | Practice Question

In tropical areas of the oceanic pelagic zone, nutrient concentrations are generally lower than in temperate oceans. Based on the provided text, what is the primary reason for this difference?

  • A: Higher oxygen levels in tropical waters inhibit nutrient accumulation.
  • B: Rapid consumption of nutrients by a constant surge of phytoplankton growth.
  • C: Consistent thermal stratification year-round prevents nutrient renewal from deeper waters.
  • D: The vastness and depth of the biome dilute nutrient concentrations evenly.

Explanation

The 'Chemical Environment' section for the Oceanic Pelagic Zone states: 'Because they are thermally stratified year-round, some tropical areas of the oceanic pelagic zone have lower nutrient concentrations than temperate oceans.' This stratification prevents nutrient-rich deeper waters from mixing with the surface.