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6. Why does the composition of sinking particles change with depth in the water column?

  • Skeletal material dissolve only slowly. Soft tissue, is consumed and decomposed by animals/bacteria more rapidly. Proportion increases
  • Skeletal material dissolve rapidly . Soft tissue, is consumed and decomposed by animals/bacteria only slowly. Proportion decreases
  • Skeletal material dissolve only slowly. Soft tissue, is consumed and decomposed by animals/bacteria more rapidly. Proportion decreases
  • Skeletal material dissolve rapidly . Soft tissue, is consumed and decomposed by animals/bacteria only slowly. Proportion increases

7. What is the definition of remineralisation?

  • Formation of solids from dissolved materials
  • The dissolution of "hard parts" (opal, calcite) or the oxidation (breakdown) of "soft part" (organic matter) that leads to the solubilisation of nutrients
  • The transfer of matter as a result of molecular motion.
  • The uptake of nutrients and other dissolved materials by phytoplankton.

8. What is decribed by "The process a plant uses to combine sunlight, water, and carbon dioxide to produce oxygen and sugar (energy)".

  • Photo-oxidation
  • Remineralisation
  • Primary production
  • Respiration

9. Which one of these has NOT been shown to exhibit HNLC behaviour

  • Antarctica
  • North East equatorial Atlantic
  • North west Atlantic
  • North Pacific

10. If the nitrate concentration increases from 6uM at 500m depth to 17uM at 1,000m depth, by how much, and in what way, would you predict the phosphate concentration to change over the same depth interval? Assume that the Redfield ratio is 106:16:1

  • Increase by 0.69
  • Decrease by 1.45
  • Increase by 1.45
  • Decrease by 0.69