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Herbicides allow cereal crops to be grown very efficiently, with virtu

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Herbicides allow cereal crops to be grown very efficiently, with virtu  [#permalink]

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New post Updated on: 24 Sep 2018, 05:10
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Herbicides allow cereal crops to be grown very efficiently, with virtually no competition for weeds. In Britain, the partridge populations have been steadily decreasing since herbicide use became widespread. Some environmentalists claim 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 chick's 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 fields 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 than partridges that live in and 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

Originally posted by kimmyg on 10 Oct 2005, 07:41.
Last edited by Bunuel on 24 Sep 2018, 05:10, edited 2 times in total.
Renamed the topic and edited the question.
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Re: Herbicides allow cereal crops to be grown very efficiently, with virtu  [#permalink]

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New post 11 Oct 2005, 15:59
1
The author is arguing that the explanation used by environmentalists is not correct. In order to weaken the argument, evidence supporting the environmentalists' explanation must be given. A is the only answer choice that supports this explanation.

Hope to be useful for u.
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Re: Herbicides allow cereal crops to be grown very efficiently, with virtu  [#permalink]

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New post 12 Oct 2005, 14:09
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Go with A. Stimulus says that the herbicide is causing the decrease. conclusion is something else is responsible. We need a statment to weaken the conclusion.
A indirectly weakens the conclusion. Because of the herbicide, the decrease in plants is reducing the food supply for the birds.

kimmyg wrote:
Herbicides allow cereal crops to be grown very efficiently, with virtually no competition for weeds. In Britain, the partridge populations have been steadily decreasing since herbicide use became widespread. Some environmentalists claim 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 fields 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 than partridges that live in and 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

I need an explanation for this please.
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Herbicides allow cereal crops to be grown very efficiently, with virtu  [#permalink]

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New post 11 Jul 2013, 03:48
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Herbicides allow cereal crops to be grown very efficiently, with virtually no competition for weeds. In Britain, the partridge populations have been steadily decreasing since herbicide use became widespread. Some environmentalists claim 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 fields 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 than partridges that live in and 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

conclusion:something OTHER THAN herbicide use must be responsible for the population decrease.

we have to weaken this means we have to show that population decrease is because of the herbicide use (and not other than herbicide use) .

option A:The elimination of certain weeds from cereal crop fields has reduced the population of the SMALL INSECTS that live on those weeds and thatform a major part of partridge chicks’ diet.==>So here insects are dying because of herbicides..and insects are major part of birds diet.==>means birds are lacking in their food and because of this they are dying...===>so overall it is effect of HERBICIDES ONLY..hence it weakens==>correct

option E:The toxins contained in herbicides typically used on cereal crops can be readily identified in the tissues of animals that have ingested them ==>MEANS if somebody ingested that toxins it can be readily find in the tissues===>its stating fact====>that if you eat 5gms of toxins then it can be detected on your tissues...does this say it is poisoning birds...or what amount does this will poison bird.....so its stating a fact====and hence not affecting the conclusion.

hope it helps
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Re: Herbicides allow cereal crops to be grown very efficiently, with virtu  [#permalink]

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New post 26 Feb 2014, 02:08
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 crops to be grown very efficiently, with virtu  [#permalink]

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New post 26 Feb 2014, 06:22
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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 crops to be grown very efficiently, with virtu  [#permalink]

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New post 17 Jun 2015, 07:56
Herbicides allow cereal crops to be grown very efficiently, with virtually no competition for weeds. In Britain, the partridge populations have been steadily decreasing since herbicide use became widespread. Some environmentalists claim 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?

Conclusion : There is some other reason for deaths and the reason is not pesticides.
premise : no more than trace quantities of herbicides in partridges on herbicide treated land.

Weaken.


(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.
This option says -> Pesticides are not directly responsible but indirectly pesticides are "Responsible" hence weakens the argument

(B) Since partridges are valued as game birds, records of their population are more carefully kept than those for many other birds
Out of scope

(C) Some of the weeds that are eliminated from cereal crop fields 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
The argument is about the birds

(D) Birds other than partridges that live in and around cereal crop fields have also been suffering population declines.
Birds other than Partridges -> out of scope as we are concerned about "partridges" only.
Tip : if you have less time, normally "other than" is the wrong option in strengtheners and weakeners questions. Not a rule but a observation.

(E) The toxins contained in herbicides typically used on cereal crops can be readily identified in the tissues of animals that have ingested them
Supports the argument that pesticides are not to be blamed
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Re: Herbicides allow cereal crops to be grown very efficiently, with virtu  [#permalink]

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New post 12 Aug 2016, 00:55
Herbicides allow cereal crops to be grown very efficiently, with virtually no competition for weeds. In Britain, the partridge populations have been steadily decreasing since herbicide use became widespread. Some environmentalists claim 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?

Because Small trace of Herbicides is found in partridges so something else is the reason for population decrease.

We need to weaken this point. At least keep in mind that we need some information that tells herbicides ARE the reason for population decrease.

(B) Since partridges are valued as game birds, records of their population are more carefully kept than those for many other birds
This data tells us that yes the population decrease that is being talked about in argument is true. But we need the information on HOW the decrease happened. Irrelevant choice. (this choice can trap those who would read the choice A and definitely will not get the logic in one go and may pick choice B because this choice looks like the one which weakens/strengthens by talking about DATA).

(C) Some of the weeds that are eliminated from cereal crop fields 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
Crop yield is not the concern of the argument. Irrelevant choice. This is no way connected to the population decrease.


(D) Birds other than partridges that live in and around cereal crop fields have also been suffering population declines.
If other birds have also been suffering then again we have same question about these birds as well. Did herbicides do some damage to their population. So overall this choice does not resolve the issue. Irrelevant choice. It does nothing to the said conclusion.

(E) The toxins contained in herbicides typically used on cereal crops can be readily identified in the tissues of animals that have ingested them
It tells that the discovery of traces in partridges is true. But then the conclusion is one step ahead of the information. It can only strengthen a little bit. But for me it is irrelevant.

(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.

You applied Herbicides and certain weeds eliminated. Hence:

Hericides -----> certain weeds eliminated

Elimination------->reduce small insects

Reduction ------->chicks’ die of hunger (population decrease in partridges)

Hence herbicides ------->partridges population decrease

At first glance this choice would look like a strengthen-er. But this choice does weaken. The only logic here is that you don’t see cause and effect but you see cause—effect-1 (cause-1)—effect-2(cause-2)---final effect. You remember? That only initial cause and final effect matters. Hence A is correct.
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Re: Herbicides allow cereal crops to be grown very efficiently, with virtu  [#permalink]

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New post 23 Sep 2016, 23:59
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.

Type- Weaken
Boil it down- something other than herbicide use must be responsible for the population decrease
Pre- Thinking - Alternate cause did not happen here or herbicides cause the population decrease indirectly .

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. Correct
Herbicides -> weeds die -> insects that feed on those weeds die -> food source for the bird decreases
b. Since partridges are valued as game birds, records of their population are more carefully kept than those for many other birds. Irrelevant
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 . Irrelevant
d. Birds other then partridges that live in or around cereal crop fields have also been suffering population declines . Irrelevant
e. The toxins contained in herbicides typically used on cereal crops can be readily identified in the tissues of animals that have ingested them. Irrelevant

Answer A
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Re: Herbicides allow cereal crops to be grown very efficiently, with virtu  [#permalink]

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New post 23 Sep 2018, 08:43
The answer is A.

We are looking to weaken the argument - that is, to argue that the herbicides are what is killing the birds, even though it is not found in their bodies. Therefore, it must harming them in some more indirect way.

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 exactly what we're looking for: an indirect causation: herbicide > less weeds > less food for birds > less birds
b. Since partridges are valued as game birds, records of their population are more carefully kept than those for many other birds this only strengthens the basic fact that they are indeed decreasing, not that herbicide is the cause
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 irrelevant - this points out a problem with the herbicides, not related to the birds' death
d. Birds other then partridges that live in or around cereal crop fields have also been suffering population declines This strengthens the general correlation between bird death and crops, but not specifically between death and herbicides - maybe the alternate reasons that caused it to the partridges caused it to other birds too?
e. The toxins contained in herbicides typically used on cereal crops can be readily identified in the tissues of animals that have ingested them weakens - if this is the case, then the evidence that there are no toxins in their body is very strong
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