Intro to oceans - Hilary online test compilation B

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1. The remains of which of the following type of planktonic organism are most likely to be remineralised (added back to seawater) and least likely to reach and accumulate on the ocean floor after death/being consumed

  • Coccolithophores
  • Organic walled phytoplankton
  • Diatoms
  • Radiolarians
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Other questions in this quiz

2. Which of these statements is FALSE?

  • Dissolved oxygen displays conservative behaviour in sea water
  • The oldest bottom waters are in the North Pacific and so we should expect them to be most impoverished in dissolved oxygen
  • Only half the elements found in the periodic table are found dissolved in seawater
  • Profiles for scavenged elements show that their concentration decreases with depth.

3. Which ion is a major constituent of seawater?

  • Magnesium
  • Iron
  • Zinc
  • Phosphorus

4. What is the main reason why water sinking in polar regions has a high oxygen concentration?

  • Mainly because oxygen is more dense than any other gas, causing the water to sink
  • Mainly because phytoplankton abundance is very high in polar regions and so oxygen is supersaturated due to photosynthesis
  • Mainly because the water is very cold and so the solubility of oxygen is enhanced
  • Mainly because the waters in polar regions have a lower salinity than the rest of the ocean

5. Which of the following statements about coccolithophores is FALSE?

  • When the algal cell dies, the coccosphere disintegrates easily, releasing the individual plates, the coccoliths, into suspension.
  • Coccoliths are made up of minute plates of calcite usually less then 10 centimeters in size
  • The white cliffs of Dover are formed of chalk that is mostly comprised of coccoliths
  • Coccolithophores envelope themselves in coccoliths to form coccospheres.


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