1. using the stoichiometric equation for respiration. In samples taken at different depths from below the euphotic zone, nitrate concentrations increase by 9.6M. Over the same depth, by how much would you predict the phosphate concentration to change ?
128 microM
0.6 microM
5 microM
8 microM
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Other questions in this quiz
2. Which of these statements is true?
The constancy of composition of seawater is maintained because most of the major constituents exhibit conservative behaviour.
The concentration of ions exhibiting conservative behaviour are significantly changed by biological and chemical reactions in seawater.
Most major ions behave non conservatively
Most minor and trace ions behave conservatively
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.
1cm3
2.7cm3
1.6 cm3
10cm3
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. 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 patches of the ocean that have high magnetism
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, 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 a cooling of the surface ocean waters.
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