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# Plankton generally thrive in areas of the ocean with

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Intern
Joined: 21 Nov 2005
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Plankton generally thrive in areas of the ocean with  [#permalink]

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Updated on: 14 Mar 2017, 22:00
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91% (02:05) correct 9% (00:00) wrong based on 102 sessions

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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 oceanographersâ€™ 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.

Originally posted by bioman001 on 25 Nov 2005, 00:21.
Last edited by sallysea on 14 Mar 2017, 22:00, edited 1 time in total.
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Re: Plankton generally thrive in areas of the ocean with  [#permalink]

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25 Nov 2005, 00:26
(D) should be it.

They put iron compounds in the ocean, but those iron comounds are gone away!
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Re: Plankton generally thrive in areas of the ocean with  [#permalink]

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25 Nov 2005, 01:01
I take D. If the iron compounds were displaced, then the plankton will not thrive. This is in line with the ocenographer's hypothesis.
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Re: Plankton generally thrive in areas of the ocean with  [#permalink]

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25 Nov 2005, 04:15
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28-19: 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 oceanographersâ€™ hypothesis is false?
---> it asks us to find answer which support the oceanographers' hypothesis

The hypothesis is : " this shortage of iron prevents plankton from thriving" -----> iron does influence the thriving of plankton-----> the answer must be sth which supports this.

A: Not all of the nitrogen compounds that are sometimes found in relatively high concentrations in the oceans are nutrients for plankton.
-------> nothing related to iron --->can't be correct answer.

B: Certain areas of the ocean support an abundance of plankton despite having particularly low concentrations of iron.
---------> weakens the hypo------>out

C: The release of the iron compounds did not increase the supply of nitrogen compounds in the area.
-----------> doesn't change nitrogen amount in the area---->iron doesn't affect the thriving of the plankton----->weakens the hypo ----->out

D: A few days after the iron compounds were released, ocean currents displaced the iron-rich water from the surface.
------>against the conclusion-----> support the hypo ----> keep it!

E: The iron compounds released into the area occur naturally in areas of the ocean where plankton thrive. ----> doesn't affect the conclusion as well as the hypo-->out

yes, D it is.
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Re: Plankton generally thrive in areas of the ocean with  [#permalink]

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11 Mar 2017, 12:59
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Plankton generally thrive in areas of the ocean with &nbs [#permalink] 11 Mar 2017, 12:59
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