Biologists have noted reproductive abnormalities in fish : GMAT Critical Reasoning (CR)
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# Biologists have noted reproductive abnormalities in fish

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Biologists have noted reproductive abnormalities in fish [#permalink]

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14 Mar 2011, 08:18
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Biologists have noted reproductive abnormalities in fish
that are immediately downstream of paper mills. One
possible cause is dioxin, which paper mills release
daily and which can alter the concentration of
hormones in fish. However, dioxin is unlikely to be the
cause, since the fish recover normal hormone
concentrations relatively quickly during occasional mill
shutdowns and dioxin decomposes very slowly in the
environment.
Which one of the following statements, if true, most
seriously weakens the argument?
(A) Some of the studies that show that fish recover
quickly during shutdowns were funded by
paper manufacturers.
(B) The rate at which dioxin decomposes varies
depending on the conditions to which it is
exposed.
(C) Normal river currents carry the dioxin present in
the river far downstream in a few hours.
(D) Some of the fish did not recover rapidly from
the physiological changes that were induced by
the changes in hormone concentrations.
(E) The connection between hormone concentrations
and reproductive abnormalities is not
thoroughly understood.
[Reveal] Spoiler: OA

Last edited by vjsharma25 on 15 Mar 2011, 08:01, edited 1 time in total.
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Re: Biologists and paper mills [#permalink]

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14 Mar 2011, 13:38
is it C?
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14 Mar 2011, 19:58
heygirl wrote:
is it C?

You are right!!
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14 Mar 2011, 19:58
heygirl wrote:
is it C?

You are right!!
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Re: Biologists and paper mills [#permalink]

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15 Mar 2011, 06:17
1
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finally, i now understand the CR....
the main point is that the CR supposed that saying the eproductive abnormalities in fish caused by dioxin from paper mill, the dioxin which is released daily far downstream is totally wrong because the dioxin decomposes very slowly in ENVIROMENT and since the paper mill shutdowns sometimes and the fact is that the fish recovered very quickly right after the paper mill shutdowns ( shutdowns here is it stop releasing dioxin in the river and when it stop releasing dioxin in the river, the fish becomes nornal again, like nothing happen)

C weakens it by saying that although paper mills stop releasing dioxin into the river sometimes but its effect is still there because the river carrys dioxin in hours....

does it help?

this CR is tough... is it from Lsat?
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Re: Biologists and paper mills [#permalink]

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15 Mar 2011, 06:57
vjsharma25 wrote:
Biologists have noted reproductive abnormalities in fish
that are immediately downstream of paper mills. One
possible cause is dioxin, which paper mills release
daily and which can alter the concentration of
hormones in fish. However, dioxin is unlikely to be the
cause, since the fish recover normal hormone
concentrations relatively quickly during occasional mill
shutdowns and dioxin decomposes very slowly in the
environment.
Which one of the following statements, if true, most
seriously weakens the argument?
(A) Some of the studies that show that fish recover
quickly during shutdowns were funded by
paper manufacturers.
(B) The rate at which dioxin decomposes varies
depending on the conditions to which it is
exposed.
(C) Normal river currents carry the dioxin present in
the river far downstream in a few hours.
(D) Some of the fish did not recover rapidly from
the physiological changes that were induced by
the changes in hormone concentrations.
(E) The connection between hormone concentrations
and reproductive abnormalities is not
thoroughly understood.

vjsharma25, can you please let me know the source ?? Thanks
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15 Mar 2011, 07:44
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Onell wrote:
vjsharma25, can you please let me know the source ?? Thanks

Source is mentioned in the question tag,its from LSAT.
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15 Mar 2011, 07:48
vjsharma25 wrote:
heygirl wrote:
is it C?

You are right!!

Sure.
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Re: Biologists and paper mills [#permalink]

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15 Mar 2011, 07:52
3
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Conclusion here is dioxin is not the cause

(A) Some of the studies that show that fish recover
quickly during shutdowns were funded by
paper manufacturers.not related to conclusion
(B) The rate at which dioxin decomposes varies
depending on the conditions to which it is
exposed.if anything,strengthens the argument
(C) Normal river currents carry the dioxin present in
the river far downstream in a few hours.best answer. it says that dioxin travels far downstream because of the currents. Hence, the first statement of the argument is weakened and thus the conclusion.
(D) Some of the fish did not recover rapidly from
the physiological changes that were induced by
the changes in hormone concentrations.unrelated to argument
(E) The connection between hormone concentrations
and reproductive abnormalities is not
thoroughly understood. again,unrelated
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15 Mar 2011, 08:05
heygirl wrote:
Conclusion here is dioxin is not the cause

(A) Some of the studies that show that fish recover
quickly during shutdowns were funded by
paper manufacturers.not related to conclusion
(B) The rate at which dioxin decomposes varies
depending on the conditions to which it is
exposed.if anything,strengthens the argument
(C) Normal river currents carry the dioxin present in
the river far downstream in a few hours.best answer. it says that dioxin travels far downstream because of the currents. Hence, the first statement of the argument is weakened and thus the conclusion.
(D) Some of the fish did not recover rapidly from
the physiological changes that were induced by
the changes in hormone concentrations.unrelated to argument
(E) The connection between hormone concentrations
and reproductive abnormalities is not
thoroughly understood. again,unrelated

Now thats what I want about the discussion.Answers should be discussed. Good work heygirl
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15 Mar 2011, 08:19
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The argument is saying that dioxin can not be the cause for fish problem.Since dioxin doesn't decompose very easily it must be present in the water even when the mill is shutdown.But strangely fish recover.So there is some other cause to the fish problem.
So any answer choice which can show that indeed dioxin is the cause of the problem, is the right answer.

"C" says that Normal river currents quickly carry the dioxin far downstream.It means that dioxin is washed away from the fish area,thats why they recover.During normal operation of the mill,there is continuous release of dioxin in the river,thats why normal current can't carry the substantial amount of dioxin with it.So it proves that dioxin is the cause.Hence the answer.
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15 Mar 2011, 08:36
Vjsharma,kudos to you! great explanation. it is so nice of you to post all such questions here. really helpful.
i'm doing my CR prep with only these questions!
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15 Mar 2011, 08:50
heygirl wrote:
Vjsharma,kudos to you! great explanation. it is so nice of you to post all such questions here. really helpful.
i'm doing my CR prep with only these questions!

Thanks for the encouragement.
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16 Mar 2011, 06:38
vjsharma25 wrote:
The argument is saying that dioxin can not be the cause for fish problem.Since dioxin doesn't decompose very easily it must be present in the water even when the mill is shutdown.But strangely fish recover.So there is some other cause to the fish problem.
So any answer choice which can show that indeed dioxin is the cause of the problem, is the right answer.

"C" says that Normal river currents quickly carry the dioxin far downstream.It means that dioxin is washed away from the fish area,thats why they recover.During normal operation of the mill,there is continuous release of dioxin in the river,thats why normal current can't carry the substantial amount of dioxin with it.So it proves that dioxin is the cause.Hence the answer.

I did not quite understand your analysis. You are saying that "Normal river currents quickly carry the dioxin far downstream.It means that dioxin is washed away from the fish area,thats why they recover". If so this is strengthening the argument isn't it? From this how did you deduce that "During normal operation of the mill,there is continuous release of dioxin in the river,thats why normal current can't carry the substantial amount of dioxin with it". Anyways as per the argument fish recover when the mill is shutdown. So the current has time to take the dioxin further downstream.
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16 Mar 2011, 08:43
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nikhilsrl wrote:
I did not quite understand your analysis. You are saying that "Normal river currents quickly carry the dioxin far downstream.It means that dioxin is washed away from the fish area,thats why they recover". If so this is strengthening the argument isn't it?
No.Argument says that dioxin is not the cause for fish problem.Argument tries to support its conclusion by stating that dioxin decomposes very slowly,so even when mill is shutdown,dioxin should be present.Then how come fish recover,so there should be some cause other than dioxin.But if fish recover when dioxin is washed away then it means that dioxin is the root cause.Because in its absence all good things happen to fish.And when mill is not shutdown, because of which there is continuous supply of dioxin in the river,fish have reproductive abnormalities..

From this how did you deduce that "During normal operation of the mill,there is continuous release of dioxin in the river,thats why normal current can't carry the substantial amount of dioxin with it". Anyways as per the argument fish recover when the mill is shutdown. So the current has time to take the dioxin further downstream.
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17 Mar 2011, 11:28
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c
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19 Mar 2011, 07:50
vjsharma25 wrote:
nikhilsrl wrote:
I did not quite understand your analysis. You are saying that "Normal river currents quickly carry the dioxin far downstream.It means that dioxin is washed away from the fish area,thats why they recover". If so this is strengthening the argument isn't it?
No.Argument says that dioxin is not the cause for fish problem.Argument tries to support its conclusion by stating that dioxin decomposes very slowly,so even when mill is shutdown,dioxin should be present.Then how come fish recover,so there should be some cause other than dioxin.But if fish recover when dioxin is washed away then it means that dioxin is the root cause.Because in its absence all good things happen to fish.And when mill is not shutdown, because of which there is continuous supply of dioxin in the river,fish have reproductive abnormalities..

From this how did you deduce that "During normal operation of the mill,there is continuous release of dioxin in the river,thats why normal current can't carry the substantial amount of dioxin with it". Anyways as per the argument fish recover when the mill is shutdown. So the current has time to take the dioxin further downstream.

Thanks I was just not able to get my head round that arg.
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11 Jul 2013, 22:39
vjsharma25 wrote:
The argument is saying that dioxin can not be the cause for fish problem.Since dioxin doesn't decompose very easily it must be present in the water even when the mill is shutdown.But strangely fish recover.So there is some other cause to the fish problem.
So any answer choice which can show that indeed dioxin is the cause of the problem, is the right answer.

"C" says that Normal river currents quickly carry the dioxin far downstream.It means that dioxin is washed away from the fish area,thats why they recover.During normal operation of the mill,there is continuous release of dioxin in the river,thats why normal current can't carry the substantial amount of dioxin with it.So it proves that dioxin is the cause.Hence the answer.

Hi vjsharma,
I still dont get why C is the answer. It is rather strengthen the argument by saying that fishes get enough time to recover during shutdowns and since no. of shutdowns are frequent, so as recovery time for fishes, hence releasing dioxin by paper mill won't harm much to fishes.
Hope I am making sense!
Rather I would go for option A, which directly attacks on the premise or the validity of the study.
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Re: Biologists have noted reproductive abnormalities in fish [#permalink]

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Re: Biologists have noted reproductive abnormalities in fish [#permalink]

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31 Jul 2014, 09:10
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Re: Biologists have noted reproductive abnormalities in fish   [#permalink] 31 Jul 2014, 09:10

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