Hilary Kennedy Practice questions

1. Which of these statements is false?

  • The processes of photosynthesis and respiration are the two major controls on the depth distribution of phosphate and nitrate.
  • Photosynthesis uses the energy from sunlight to create organic compounds.
  • Photosynthesis occurs throughout the water column
  • Respiration occurs throughout the water column
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Other questions in this quiz

2. What is the average oceanic mixing time?

  • 5000 years
  • 1,500 years
  • 500 years
  • 50 years

3. Why is iron fertilisation a topic of great current interest?

  • Because it stimulates biological activity in regions with low phytoplankton growth but high nutrients, leading to a high export flux of carbon to the sea floor.
  • Because it stimulates biological activity in regions with low phytoplankton growth but high nutrients, leading to a cooling of the surface ocean waters.
  • Because it stimulates biological activity, which are heavier than normal and so sink rapidly.
  • Because it stimulates biological activity in regions with low phytoplankton growth but high nutrients, leading to patches of the ocean that have high magnetism

4. Which of the following statements is false?

  • An increase in the turbidity (presence of particles) of seawater, reduces the depth to which sunlight can penetrate.
  • Net nutrient removal is observed in the sunlit surface waters where the rate of photosynthesis exceeds the rate of respiration
  • The chlorophyll molecule selectively absorbs green light and the energy absorbed is transferred to electrons, which are used to split water, form sugars, ATP and NADH
  • At 500m depth where light to too low for photosynthesis, respiration dominates and oxygen concentrations are observed to decrease

5. In what situation does the rate of production of marine aggregates generally exceed the rate of disaggregation and/or consumption, leading to the occurrence of aggregates at the sea bed?

  • During seasonal blooms of phytoplankton
  • During period of high pressure
  • During periods of high winds delivering dust to the ocean
  • During winter periods with low biological activity.

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