Hilary Kennedy Practice questions

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1. What happens to MOST of the biologically produced particulate matter that is produced in the upper, sunlit part of the ocean?

  • Most biological material sinks through the water column and is decomposed and recycled in the deep water column below 1000m
  • Most biological material is recycled in the surface waters
  • Most biological material sinks through the water column and accumulates in the sediments below.
  • Most of the biological material reaches the sediments
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2. 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

3. For practical reasons a 4mM secondary standard is to be made from the primary (2.5M) standard solution. What volume of the 2.5 M standard solution would you need to add and dilute in a 1 litre volumetric to make the 4mM secondary standard.

  • 10cm3
  • 1cm3
  • 1.6 cm3
  • 2.7cm3

4. What is the definition of a bio-unlimited constituent

  • A constituent whose concentration in solution is controlled primarily by biological activity.
  • A constituent whose concentration in solution is unaffected by biological activity.
  • A constituent whose concentration in solution is affected by both physical and biological activity
  • . A constituent whose concentration in solution is controlled by scavenging.

5. Which process can be described as "The cellular process by which molecules are oxidized, releasing energy and liberating carbon dioxide as a waste product".

  • Photosynthesis
  • Recycling
  • Respiration
  • Dissolution

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