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Plankton generally thrive in areas of the ocean with sufficient concen

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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 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.

Originally posted by bioman001 on 24 Nov 2005, 23:21.
Last edited by gmat1393 on 22 Oct 2018, 06:31, edited 4 times in total.
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Re: Plankton generally thrive in areas of the ocean with sufficient concen  [#permalink]

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New post 12 Nov 2010, 06:43
4
1
raghavs wrote:
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.


This question is a little twisted so you have to make sure you understand it well.

Which of the following, if true, argues most strongly against concluding, on the basis of
the information above, that the oceanographers’ hypothesis is false?

oceanographers’ hypothesis - oceanographers hypothesize that this shortage of iron prevents plankton from thriving

argues against concluding that above is false. So you have to argue against hypothesis being false - in effect - you have to argue that the hypothesis might still be true. So look for something that says that the hypothesis could still be true and it could still be the missing iron that is the cause of low plankton population.
So you are looking for missing iron explanation.
D tells you that iron is still missing because it got displaced. That's the answer.
E could actually be part-basis of the hypothesis. It doesn't say why the hypothesis may still be true.
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Re: Plankton generally thrive in areas of the ocean with sufficient concen  [#permalink]

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New post 24 Nov 2005, 23:26
(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 sufficient concen  [#permalink]

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New post 25 Nov 2005, 00:01
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 sufficient concen  [#permalink]

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New post 25 Nov 2005, 03:15
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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 oceanographers’ 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 sufficient concen  [#permalink]

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New post 28 Sep 2008, 19:22
IMO D.

We need a statement that points out the oceanographer's hypothesis is not false. D says that the iron are displaced after a few days, therefore we cannot conclude that the hypothesis is false.
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Re: Plankton generally thrive in areas of the ocean with sufficient concen  [#permalink]

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New post 29 Sep 2008, 01:17
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arorag wrote:
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.


ONLY "D" ARGUES THAT THE OCEANOGRAPHERS ARE CORRECT IN THEIR HYPOTHESIS
IMO D
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Re: Plankton generally thrive in areas of the ocean with sufficient concen  [#permalink]

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New post 30 Sep 2008, 20:17
D sounds correct.
Despite increased Iron concentration, planktons did not grow. Then how could the oceanographers be "not wrong"? This could only happen if their requirements were not met. D says that the Iron got washed away. This means that their requirement was not met. Had the requirement been met, would they have been proven right? That's another issue that we are not concerned with.
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Re: Plankton generally thrive in areas of the ocean with sufficient concen  [#permalink]

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New post 30 Sep 2008, 20:38
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I do not agree with (A) because, in the argument it is given that "Nevertheless, some areas, though rich in these nitrogen compounds,". Clearly, the required nitrogen compounds are available.

IMO (D) because the iron compunds were not present for the planktons to flourish. It is not given in the argument that, the planktons will start thriving as soon as the iron compounds are made available. Hence the "few days" shouldn't be a concern. What is OA?
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Re: Plankton generally thrive in areas of the ocean with sufficient concen  [#permalink]

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New post 19 Nov 2014, 22:34
1
Option D tells us that Iron is important and supports the hypothesis of the scientists and that it was washed away supports the conclusion that iron is important for growth of planktons.

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Re: Plankton generally thrive in areas of the ocean with sufficient concen  [#permalink]

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New post 31 Jul 2015, 20:01
VeritasPrepKarishma wrote:
raghavs wrote:
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.


This question is a little twisted so you have to make sure you understand it well.

Which of the following, if true, argues most strongly against concluding, on the basis of
the information above, that the oceanographers’ hypothesis is false?

oceanographers’ hypothesis - oceanographers hypothesize that this shortage of iron prevents plankton from thriving

argues against concluding that above is false. So you have to argue against hypothesis being false - in effect - you have to argue that the hypothesis might still be true. So look for something that says that the hypothesis could still be true and it could still be the missing iron that is the cause of low plankton population.
So you are looking for missing iron explanation.
D tells you that iron is still missing because it got displaced. That's the answer.
E could actually be part-basis of the hypothesis. It doesn't say why the hypothesis may still be true.


Hello Karishma,
Hypothesis
Less iron -> less plankton
=> More plankton ->More iron

So i chose option E thinking in areas where we see plankton is thriving there is iron .
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Re: Plankton generally thrive in areas of the ocean with sufficient concen  [#permalink]

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New post 06 Aug 2015, 22:26
divya517 wrote:
VeritasPrepKarishma wrote:
raghavs wrote:
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.


This question is a little twisted so you have to make sure you understand it well.

Which of the following, if true, argues most strongly against concluding, on the basis of
the information above, that the oceanographers’ hypothesis is false?

oceanographers’ hypothesis - oceanographers hypothesize that this shortage of iron prevents plankton from thriving

argues against concluding that above is false. So you have to argue against hypothesis being false - in effect - you have to argue that the hypothesis might still be true. So look for something that says that the hypothesis could still be true and it could still be the missing iron that is the cause of low plankton population.
So you are looking for missing iron explanation.
D tells you that iron is still missing because it got displaced. That's the answer.
E could actually be part-basis of the hypothesis. It doesn't say why the hypothesis may still be true.


Hello Karishma,
Hypothesis
Less iron -> less plankton
=> More plankton ->More iron

So i chose option E thinking in areas where we see plankton is thriving there is iron .


Hey Divya,

The question is a bit more complicated than that.

What is the purpose of the argument given? It is to conclude that the oceanographers’ hypothesis is false.
The argument gives us that experimental release of iron compounds does not increase plankton population. So it is trying to tell us that the oceanographers’ hypothesis is not correct.

Now we have to provide data to argue against concluding that the oceanographers’ hypothesis is false. So we have to attack the experiment. How releasing iron compounds may not have actually led to increase in the desired iron concentration and hence how the experiment may not be a good judge of oceanographers’ hypothesis.

Option (E) actually supports the experiment by saying that the right kind of iron was released. So it argues in favour of the experiment's result and hence argues in favour of conclusion that the oceanographers’ hypothesis is indeed false. What we actually need to do is exact opposite. We need to provide data to argue against concluding that the oceanographers’ hypothesis is false.
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Re: Plankton generally thrive in areas of the ocean with sufficient concen  [#permalink]

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New post 28 Jan 2016, 05:45
Hi VeritasPrepKarishma ,

I am still not able to understand the twist...:(

oceanographers hypothesize that--> the low level of iron is the cause that prevents plankton to thrive.
That means.

Low level of iron--> Low plankton
High level of iron--> High plankton.

Question stem---> argues most strongly against concluding

So we need to find an option which says.

Low level of iron --> HIGH plankton (In this way we are undermining oceanographers hypothesis)

Therefore I opted for option B.
B. Certain areas of the ocean support an abundance of plankton despite having
particularly low concentrations of iron.

----------------------------------------------------------------

But if we go further in question stem it says

Which of the following, if true, argues most strongly against concluding, on the basis of
the information above, that the oceanographers’ hypothesis is false?


that the oceanographers’ hypothesis is false---> does this makes the question stem double negative..??
Which in turn we need to SUPPORT the oceanographers’ hypothesis .

Is it so..??

Does it mean..

oceanographers’ hypothesis is false--> It means Low level of iron --> HIGH plankton
And now we need to argue against--> Which makes Low level of iron --> LOW plankton

Please assist.
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Re: Plankton generally thrive in areas of the ocean with sufficient concen  [#permalink]

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New post 28 Jan 2016, 06:03
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RAHKARP27071989 wrote:
Hi VeritasPrepKarishma ,

I am still not able to understand the twist...:(

oceanographers hypothesize that--> the low level of iron is the cause that prevents plankton to thrive.
That means.

Low level of iron--> Low plankton
High level of iron--> High plankton.

Question stem---> argues most strongly against concluding

So we need to find an option which says.

Low level of iron --> HIGH plankton (In this way we are undermining oceanographers hypothesis)

Therefore I opted for option B.
B. Certain areas of the ocean support an abundance of plankton despite having
particularly low concentrations of iron.

----------------------------------------------------------------

But if we go further in question stem it says

Which of the following, if true, argues most strongly against concluding, on the basis of
the information above, that the oceanographers’ hypothesis is false?


that the oceanographers’ hypothesis is false---> does this makes the question stem double negative..??
Which in turn we need to SUPPORT the oceanographers’ hypothesis .

Is it so..??

Does it mean..

oceanographers’ hypothesis is false--> It means Low level of iron --> HIGH plankton
And now we need to argue against--> Which makes Low level of iron --> LOW plankton

Please assist.


hi,
your reply B could be correct, if one were looking for the conclusion that scientists hypothesis is false..

BUT as you too have mentioned the Q asks us..
Which of the following, if true, argues most strongly against concluding, on the basis of the information above, that the oceanographers’ hypothesis is false?

Here the authors says that the experiment whch was done can be claimed to prove the hypo false...
So in a way, although not exactly, you can take that the author says the conclusion is that the scientists hypothesis is false..
Now we are asked to weaken the conclusion..

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Re: Plankton generally thrive in areas of the ocean with sufficient concen  [#permalink]

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New post 28 Jan 2016, 06:53
arorag wrote:
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.


Can Someone Explain why option A is Incorrect here.

Am always confused with this type of options.. :(
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Re: Plankton generally thrive in areas of the ocean with sufficient concen  [#permalink]

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New post 10 May 2018, 07:45
1
VeritasPrepKarishma wrote:
raghavs wrote:
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.


This question is a little twisted so you have to make sure you understand it well.

Which of the following, if true, argues most strongly against concluding, on the basis of
the information above, that the oceanographers’ hypothesis is false?

oceanographers’ hypothesis - oceanographers hypothesize that this shortage of iron prevents plankton from thriving

argues against concluding that above is false. So you have to argue against hypothesis being false - in effect - you have to argue that the hypothesis might still be true. So look for something that says that the hypothesis could still be true and it could still be the missing iron that is the cause of low plankton population.
So you are looking for missing iron explanation.
D tells you that iron is still missing because it got displaced. That's the answer.
E could actually be part-basis of the hypothesis. It doesn't say why the hypothesis may still be true.


Quote:
Regarding choice D - i rejected because of the last sentence mentioned in argument (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.).

If local iron concentrations were increased immediately, so it does not matter that iron got displaced by water.
Please explain.


Even though the concentration of iron increased immediately in the water, the iron rich water was displaced very soon. Hence the plankton may not have got time to absorb the iron and multiply. So it is still possible that plankton is not thriving due to lack of iron.
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Re: Plankton generally thrive in areas of the ocean with sufficient concen &nbs [#permalink] 10 May 2018, 07:45
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