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Herbicides allow cereal crop to be grown very efficiently,

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Herbicides allow cereal crop to be grown very efficiently, [#permalink] New post 06 Sep 2008, 19:00
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A
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90% (02:21) correct 10% (00:56) wrong based on 8 sessions
Herbicides allow cereal crop to be grown very efficiently, with virtually no competition from weeds. In Britain, partridge populations have been steadily decreasing since herbicide use became widespread. Some environmentalist claims that these birds, which live in and around cereal crop fields, are being poisoned by the herbicides. However, tests show no more than trace quantities of herbicides in partridges on herbicide-treated land. Therefore, something other than herbicide use must be responsible for the population decrease.

Which of the following, if true about Britain, most seriously weakens the argument?


a. The elimination of certain weeds from cereal crop fields has reduced the population of the small insects that live on those weeds and that form a major part of partridge chicks’ diet
b. Since partridges are valued as game birds, records of their population are more carefully kept than those for many other birds
c. Some of the weeds that are eliminated from cereal crop by herbicides are much smaller than the crop plants themselves and would have no negative effect on crop yield if they were allowed to grow
d. Birds other then partridges that live in or around cereal crop fields have also been suffering population declines
e. The toxins contained in herbicides typically used on cereal crops can be readily identified in the tissues of animals that have ingested them.
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Re: CR- Herbicide problem [#permalink] New post 06 Sep 2008, 19:17
ttwang56 wrote:
Herbicides allow cereal crop to be grown very efficiently, with virtually no competition from weeds. In Britain, partridge populations have been steadily decreasing since herbicide use became widespread. Some environmentalist claims that these birds, which live in and around cereal crop fields, are being poisoned by the herbicides. However, tests show no more than trace quantities of herbicides in partridges on herbicide-treated land. Therefore, something other than herbicide use must be responsible for the population decrease.

Which of the following, if true about Britain, most seriously weakens the argument?


a. The elimination of certain weeds from cereal crop fields has reduced the population of the small insects that live on those weeds and that form a major part of partridge chicks’ diet
b. Since partridges are valued as game birds, records of their population are more carefully kept than those for many other birds
c. Some of the weeds that are eliminated from cereal crop by herbicides are much smaller than the crop plants themselves and would have no negative effect on crop yield if they were allowed to grow
d. Birds other then partridges that live in or around cereal crop fields have also been suffering population declines
e. The toxins contained in herbicides typically used on cereal crops can be readily identified in the tissues of animals that have ingested them.


A is the answer. Not direct but INDIRECT factor affects the decrease in population.
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Re: CR- Herbicide problem [#permalink] New post 06 Sep 2008, 19:28
Was stuck between A and E.

E suggests that toxins are identified, but the passage already mentions that traces of herbicide is found in the bird. So it does not weaken.

IMO A
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Re: CR- Herbicide problem [#permalink] New post 06 Sep 2008, 20:52
Richardson wrote:
ttwang56 wrote:
Herbicides allow cereal crop to be grown very efficiently, with virtually no competition from weeds. In Britain, partridge populations have been steadily decreasing since herbicide use became widespread. Some environmentalist claims that these birds, which live in and around cereal crop fields, are being poisoned by the herbicides. However, tests show no more than trace quantities of herbicides in partridges on herbicide-treated land. Therefore, something other than herbicide use must be responsible for the population decrease.

Which of the following, if true about Britain, most seriously weakens the argument?


a. The elimination of certain weeds from cereal crop fields has reduced the population of the small insects that live on those weeds and that form a major part of partridge chicks’ diet
b. Since partridges are valued as game birds, records of their population are more carefully kept than those for many other birds
c. Some of the weeds that are eliminated from cereal crop by herbicides are much smaller than the crop plants themselves and would have no negative effect on crop yield if they were allowed to grow
d. Birds other then partridges that live in or around cereal crop fields have also been suffering population declines
e. The toxins contained in herbicides typically used on cereal crops can be readily identified in the tissues of animals that have ingested them.


A is the answer. Not direct but INDIRECT factor affects the decrease in population.



but isn't this question asking what weakens the conclusion which is that something else besides the herbicide is affecting the population? or is what we are trying to weaken what the british enviromentals are claiming?
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Re: CR- Herbicide problem [#permalink] New post 06 Sep 2008, 21:24
IMO A.
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Re: CR- Herbicide problem [#permalink] New post 06 Sep 2008, 21:31
ttwang56 wrote:
Herbicides allow cereal crop to be grown very efficiently, with virtually no competition from weeds. In Britain, partridge populations have been steadily decreasing since herbicide use became widespread. Some environmentalist claims that these birds, which live in and around cereal crop fields, are being poisoned by the herbicides. However, tests show no more than trace quantities of herbicides in partridges on herbicide-treated land. Therefore, something other than herbicide use must be responsible for the population decrease.

Which of the following, if true about Britain, most seriously weakens the argument?


a. The elimination of certain weeds from cereal crop fields has reduced the population of the small insects that live on those weeds and that form a major part of partridge chicks’ diet
b. Since partridges are valued as game birds, records of their population are more carefully kept than those for many other birds
c. Some of the weeds that are eliminated from cereal crop by herbicides are much smaller than the crop plants themselves and would have no negative effect on crop yield if they were allowed to grow
d. Birds other then partridges that live in or around cereal crop fields have also been suffering population declines
e. The toxins contained in herbicides typically used on cereal crops can be readily identified in the tissues of animals that have ingested them.


IMO A)
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Re: CR- Herbicide problem [#permalink] New post 06 Sep 2008, 23:22
Doesnt A strengthen the argument??

I will go with E
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Re: CR- Herbicide problem [#permalink] New post 07 Sep 2008, 03:39
IgnitedMind wrote:
Doesnt A strengthen the argument??

I will go with E


Argument is saying that the use of H is not a reason for the number decrease. Choice A shows, even the use of H is not a DIRECT reason for the decrease, it's an INDIRECT (decrease of prey) reason for the decrease. So it makes the argument weakened.
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Re: CR- Herbicide problem [#permalink] New post 25 Feb 2014, 04:38
Richardson wrote:
ttwang56 wrote:
Herbicides allow cereal crop to be grown very efficiently, with virtually no competition from weeds. In Britain, partridge populations have been steadily decreasing since herbicide use became widespread. Some environmentalist claims that these birds, which live in and around cereal crop fields, are being poisoned by the herbicides. However, tests show no more than trace quantities of herbicides in partridges on herbicide-treated land. Therefore, something other than herbicide use must be responsible for the population decrease.

Which of the following, if true about Britain, most seriously weakens the argument?


a. The elimination of certain weeds from cereal crop fields has reduced the population of the small insects that live on those weeds and that form a major part of partridge chicks’ diet
b. Since partridges are valued as game birds, records of their population are more carefully kept than those for many other birds
c. Some of the weeds that are eliminated from cereal crop by herbicides are much smaller than the crop plants themselves and would have no negative effect on crop yield if they were allowed to grow
d. Birds other then partridges that live in or around cereal crop fields have also been suffering population declines
e. The toxins contained in herbicides typically used on cereal crops can be readily identified in the tissues of animals that have ingested them.


A is the answer. Not direct but INDIRECT factor affects the decrease in population.

I don't think this is a very well phrased question then. Since herbicides is still responsible for the decrease of the population in that sense. Thus the passage should change to something like this:
Herbicides allow cereal crop to be grown very efficiently, with virtually no competition from weeds. In Britain, partridge populations have been steadily decreasing since herbicide use became widespread. Some environmentalist claims that these birds, which live in and around cereal crop fields, are being poisoned by the herbicides. However, tests show no more than trace quantities of herbicides in partridges on herbicide-treated land. Therefore, something other than herbicide use must be directly responsible for the population decrease.
Other than that, I believe the test writters are just a bunch of assholes that can't write a clear straight-forward questions
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Re: Herbicides allow cereal crop to be grown very efficiently, [#permalink] New post 25 Feb 2014, 10:01
Hey,

I think you've over thought this question. It reads perfectly OK.

Just think about it logically. What could herbicides do that CAUSES partridges to be killed
1) Poison - but we know this is out
2) Killing the plants that partridges need - no mention of this

Then Answer A gives us what we need.

Don't over complicate, think logically, then CR will become easier...

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Re: Herbicides allow cereal crop to be grown very efficiently, [#permalink] New post 25 Feb 2014, 14:37
i guess i am probably a bit serious on the problem. I will continue with the studying anyways.
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Re: Herbicides allow cereal crop to be grown very efficiently, [#permalink] New post 26 Feb 2014, 01:08
I think A option clearly gives us something else other than the "herbicides" which is responsible, hence is strengthening the main statement
Need some help
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Re: Herbicides allow cereal crop to be grown very efficiently, [#permalink] New post 26 Feb 2014, 05:22
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ankurgupta03 wrote:
I think A option clearly gives us something else other than the "herbicides" which is responsible, hence is strengthening the main statement
Need some help


Hi Ankur,

Let me see if I can explain again.

The thing with A, is that it's a couple of stages down from the pesticides that the effect occurs. BUT the CAUSE is still persticides:

Pesticides applied --> Weeds die --> Insects that eat weeds die ---> Partridges have nothing to eat so leave/die

So pesticides cause the lowering of partridge numbers

A is the answer

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Re: Herbicides allow cereal crop to be grown very efficiently, [#permalink] New post 24 Jun 2014, 02:01
James,
I need a little help in understanding this,

As stated by you to what ankur has written;
Let me see if I can explain again.

The thing with A, is that it's a couple of stages down from the pesticides that the effect occurs. BUT the CAUSE is still persticides:

Pesticides applied --> Weeds die --> Insects that eat weeds die ---> Partridges have nothing to eat so leave/die

So pesticides cause the lowering of partridge numbers

A is the answer

my doubt comes here. We readily assume that the weeds present get killed/wiped out by the pesticides and their application only. There may be several other reasons because of which they may have got cleared out. the reason i am saying this is because should we be relying on an assumption. I was stuck between A and E, but chose E on reading the stimulus again. Please help me clear this out.
Re: Herbicides allow cereal crop to be grown very efficiently,   [#permalink] 24 Jun 2014, 02:01
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