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17 Jun 2008, 17:59
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Please provide some explaination Thanks:
Q19:
Plankton generally thrive in areas of the ocean with sufficient concentrations of certain
nitrogen compounds near the surface, where plankton live. Nevertheless, some areas,
though rich in these nitrogen compounds, have few plankton. These areas have
particularly low concentrations of iron, and oceanographers hypothesize that this shortage
of iron prevents plankton from thriving. However, an experimental release of iron
compounds into one such area failed to produce a thriving plankton population, even
though local iron concentrations increased immediately.
Which of the following, if true, argues most strongly against concluding, on the basis of
the information above, that the oceanographers’ hypothesis is false?
A. Not all of the nitrogen compounds that are sometimes found in relatively high
concentrations in the oceans are nutrients for plankton.
B. Certain areas of the ocean support an abundance of plankton despite having
particularly low concentrations of iron.
C. The release of the iron compounds did not increase the supply of nitrogen
compounds in the area.
D. A few days after the iron compounds were released, ocean currents displaced the
iron-rich water from the surface.
E. The iron compounds released into the area occur naturally in areas of the ocean
where plankton thrive.
Answer:
---------------------------------------------------------------------------------------
Q19:
Plankton generally thrive in areas of the ocean with sufficient concentrations of certain
nitrogen compounds near the surface, where plankton live. Nevertheless, some areas,
though rich in these nitrogen compounds, have few plankton. These areas have
particularly low concentrations of iron, and oceanographers hypothesize that this shortage
of iron prevents plankton from thriving. However, an experimental release of iron
compounds into one such area failed to produce a thriving plankton population, even
though local iron concentrations increased immediately.
Which of the following, if true, argues most strongly against concluding, on the basis of
the information above, that the oceanographers’ hypothesis is false?
A. Not all of the nitrogen compounds that are sometimes found in relatively high
concentrations in the oceans are nutrients for plankton.
B. Certain areas of the ocean support an abundance of plankton despite having
particularly low concentrations of iron.
C. The release of the iron compounds did not increase the supply of nitrogen
compounds in the area.
D. A few days after the iron compounds were released, ocean currents displaced the
iron-rich water from the surface.
E. The iron compounds released into the area occur naturally in areas of the ocean
where plankton thrive.
Answer:
---------------------------------------------------------------------------------------
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17 Jun 2008, 18:16
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alimad
A - thats ok, not all nitogen compounds does not need to be nutrients. Also the argument is about iron.
B - Actually weakens the scientists hypotheses.
C - If Iron works by increasing the nitogen compds, then this also actually weakens the hypotheses.
D - If the iron rich water was swept away and did not have enuff time to influence the plankton environment, then this might present a cause based on which the hypotheses could not be tested and should not be written off.
E-ok, this says that the right compounds were released but nothing more than that.
17 Jun 2008, 18:31
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One more E, high concentration of iron may be due to the presence of plankton in area rather than otherway around as assumed by oceanographers that is presense of plankton is due due to high iron concentration.
misguided by question! 
