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Planners in City X noticed that many of the trees in the

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Planners in City X noticed that many of the trees in the [#permalink] New post 28 Feb 2007, 09:01
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54% (02:08) correct 46% (01:11) wrong based on 26 sessions
Planners in City X noticed that many of the trees in the city were dying because of exposure to increased levels of air and water pollution. A study they commissioned revealed that sycamore trees actually thrive in environments with elevated levels of carbon monoxide, the main pollutant emitted by automobiles. In order to reverse the trend of dying trees, the city adopted a policy to replace all sick trees with sycamore trees.

Which of the following, if true, would most weaken the logic employed by the city planners?

A) In the forest, oak trees live an average of 70 years while sycamore trees only live for an average of 50 years.
B) Automobile manufacturers are developing newer car models that emit significantly fewer pollutants.
C) A survey by Urban Forests found that the sycamore is the most common tree in American cities.
D) The city recently installed low exhaust buses for its public transportation system.
E) Sycamore trees are extremely sensitive to sulfur dioxide, the main component of acid rain.
[Reveal] Spoiler: OA

Last edited by Zarrolou on 30 Jun 2013, 04:21, edited 1 time in total.
Added OA.
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Re: CR - City Planners [#permalink] New post 28 Feb 2007, 10:38
[quote="rdg"]Planners in City X noticed that many of the trees in the city were dying because of exposure to increased levels of air and water pollution. A study they commissioned revealed that sycamore trees actually thrive in environments with elevated levels of carbon monoxide, the main pollutant emitted by automobiles. In order to reverse the trend of dying trees, the city adopted a policy to replace all sick trees with sycamore trees.

Which of the following, if true, would most weaken the logic employed by the city planners?

A) In the forest, oak trees live an average of 70 years while sycamore trees only live for an average of 50 years.
B) Automobile manufacturers are developing newer car models that emit significantly fewer pollutants.
C) A survey by Urban Forests found that the sycamore is the most common tree in American cities.
D) The city recently installed low exhaust buses for its public transportation system.
E) Sycamore trees are extremely sensitive to sulfur dioxide, the main component of acid rain.[/quote]

My Answer: E
Assumption is that sick trees are not Sycamore and the new trees will be able to withstand both air and water pollution. Sycamore is good against air pollution. Acid rain is water pollution and Sycamore is sensitive to it.

We need to prove why Sycamores are not correct choice.
A we dont know if oak will withstand air and water pollution in cities
B It will reduce air pollution not water pollution
C You cant apply a generic statement to a specific city.
D same logic as B
E Looks most promising - though not sure
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 [#permalink] New post 28 Feb 2007, 10:41
I think it's E. Although carbon monoxide is the main pollutant emitted by automobiles, it is not the only one. Therefore, there might be other pollutants that could damage sycamore trees, making city's policy of replacing other sick trees ineffective . Choice E is the only choice that addresses this issue.
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 [#permalink] New post 28 Feb 2007, 12:08
Yeah E...the city is only addressing half of the problem in Air pollution, and ignoring water pollution
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 [#permalink] New post 28 Feb 2007, 19:16
(E)
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Re: CR - City Planners [#permalink] New post 28 Feb 2007, 19:30
rdg wrote:
Planners in City X noticed that many of the trees in the city were dying because of exposure to increased levels of air and water pollution. A study they commissioned revealed that sycamore trees actually thrive in environments with elevated levels of carbon monoxide, the main pollutant emitted by automobiles. In order to reverse the trend of dying trees, the city adopted a policy to replace all sick trees with sycamore trees.

Which of the following, if true, would most weaken the logic employed by the city planners?

A) In the forest, oak trees live an average of 70 years while sycamore trees only live for an average of 50 years.
B) Automobile manufacturers are developing newer car models that emit significantly fewer pollutants.
C) A survey by Urban Forests found that the sycamore is the most common tree in American cities.
D) The city recently installed low exhaust buses for its public transportation system.
E) Sycamore trees are extremely sensitive to sulfur dioxide, the main component of acid rain.


I would like to choose B here.

In E we are assuming that the city faces the problem of acid rain. That is no where mentioned in the argument as a possibility. E for me is irrelevant.

On the other hand, the argument says that sycamore trees actually thrive in environments with elevated levels of carbon monoxide, the main pollutant emitted by automobiles. When Automobile manufacturers introduce newer car models, that emit significantly fewer pollutants then sycamore trees may not thrive. And who knows, they may even die. Hence, B seems the answer to me.
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Re: CR - City Planners [#permalink] New post 28 Feb 2007, 19:50
aurobindo wrote:
I would like to choose B here.

In E we are assuming that the city faces the problem of acid rain. That is no where mentioned in the argument as a possibility. E for me is irrelevant.

On the other hand, the argument says that sycamore trees actually thrive in environments with elevated levels of carbon monoxide, the main pollutant emitted by automobiles. When Automobile manufacturers introduce newer car models, that emit significantly fewer pollutants then sycamore trees may not thrive. And who knows, they may even die. Hence, B seems the answer to me.


You are right .... didn't read it that closely and missed "the main pollutant emitted by automobiles" part .... shame on me .....
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Re: CR - City Planners [#permalink] New post 28 Feb 2007, 20:01
aurobindo wrote:
rdg wrote:
Planners in City X noticed that many of the trees in the city were dying because of exposure to increased levels of air and water pollution. A study they commissioned revealed that sycamore trees actually thrive in environments with elevated levels of carbon monoxide, the main pollutant emitted by automobiles. In order to reverse the trend of dying trees, the city adopted a policy to replace all sick trees with sycamore trees.

Which of the following, if true, would most weaken the logic employed by the city planners?

A) In the forest, oak trees live an average of 70 years while sycamore trees only live for an average of 50 years.
B) Automobile manufacturers are developing newer car models that emit significantly fewer pollutants.
C) A survey by Urban Forests found that the sycamore is the most common tree in American cities.
D) The city recently installed low exhaust buses for its public transportation system.
E) Sycamore trees are extremely sensitive to sulfur dioxide, the main component of acid rain.


I would like to choose B here.

In E we are assuming that the city faces the problem of acid rain. That is no where mentioned in the argument as a possibility. E for me is irrelevant.

On the other hand, the argument says that sycamore trees actually thrive in environments with elevated levels of carbon monoxide, the main pollutant emitted by automobiles. When Automobile manufacturers introduce newer car models, that emit significantly fewer pollutants then sycamore trees may not thrive. And who knows, they may even die. Hence, B seems the answer to me.


I would say B is out of scope. Just because car manufacturers are building cars w/ fewer pollutants, we cannot assume that they will even be sold in City X, or that people in City X will drive these cars.

D is close, as it directly attacks carbon monoxide as the cause for thriving trees. But I dont think its strong enough, why did no one choose D, I wonder?

E does make the assumption that water pollution=acid rain, as mentioned in the stem:
trees in the city were dying because of exposure to increased levels of air and water pollution.

Test day I would have chosen E.
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 [#permalink] New post 28 Feb 2007, 20:07
rdg, What is the OA?
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 [#permalink] New post 28 Feb 2007, 20:45
OA ia 'E'

Choices (B) and (D) are out of scope; the city’s plan concerns the resistance of trees to carbon monoxide, not the potential lower level of carbon monoxide in the future. Choice (C) is irrelevant. Choice (E) provides information that suggests that the city’s plan won’t work: while sycamores thrive in environments with elevated levels of carbon monoxide, they are extremely sensitive to another pollutant that exists in City X. (E) is therefore the credited answer.
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Re: CR - City Planners [#permalink] New post 28 Feb 2007, 20:45
buckkitty wrote:
aurobindo wrote:
rdg wrote:
Planners in City X noticed that many of the trees in the city were dying because of exposure to increased levels of air and water pollution. A study they commissioned revealed that sycamore trees actually thrive in environments with elevated levels of carbon monoxide, the main pollutant emitted by automobiles. In order to reverse the trend of dying trees, the city adopted a policy to replace all sick trees with sycamore trees.

Which of the following, if true, would most weaken the logic employed by the city planners?

A) In the forest, oak trees live an average of 70 years while sycamore trees only live for an average of 50 years.
B) Automobile manufacturers are developing newer car models that emit significantly fewer pollutants.
C) A survey by Urban Forests found that the sycamore is the most common tree in American cities.
D) The city recently installed low exhaust buses for its public transportation system.
E) Sycamore trees are extremely sensitive to sulfur dioxide, the main component of acid rain.


I would like to choose B here.

In E we are assuming that the city faces the problem of acid rain. That is no where mentioned in the argument as a possibility. E for me is irrelevant.

On the other hand, the argument says that sycamore trees actually thrive in environments with elevated levels of carbon monoxide, the main pollutant emitted by automobiles. When Automobile manufacturers introduce newer car models, that emit significantly fewer pollutants then sycamore trees may not thrive. And who knows, they may even die. Hence, B seems the answer to me.


I would say B is out of scope. Just because car manufacturers are building cars w/ fewer pollutants, we cannot assume that they will even be sold in City X, or that people in City X will drive these cars.

D is close, as it directly attacks carbon monoxide as the cause for thriving trees. But I dont think its strong enough, why did no one choose D, I wonder?

E does make the assumption that water pollution=acid rain, as mentioned in the stem:
trees in the city were dying because of exposure to increased levels of air and water pollution.

Test day I would have chosen E.


In D we are assuming that many low exhaust buses were introduced and they will have impact over the pollution levels. What if the no of buses is very small. D is also assuming that buses emit carbon monoxide. Argument talks about only automobiles when talking about carbon monoxide.

I am not sure whether buses come under automobiles. Do they?:?
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 [#permalink] New post 28 Feb 2007, 21:14
Because of air and water polution trees were dying.


Sycamore trees thrive in environments with elevated levels of carbon monoxide. Options (B) and (D) both support and help to keep Sycamore tree thrive in city's environment.

But, what about water polution? Therefore, option (E) weakens the the logic employed by the city planners.
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 [#permalink] New post 01 Mar 2007, 01:58
rdg wrote:
Because of air and water polution trees were dying.


Sycamore trees thrive in environments with elevated levels of carbon monoxide. Options (B) and (D) both support and help to keep Sycamore tree thrive in city's environment.

But, what about water polution? Therefore, option (E) weakens the the logic employed by the city planners.


U mean acid rain is a pollutant? As far as I understand acid rains occur when the level of SO2 in air goes to a very high level. SO2 is not even mentioned in the argument.

anyways...OA is OA :lol:
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Re: Planners in City X noticed that many of the trees in the [#permalink] New post 30 Jun 2013, 04:19
rdg wrote:
Planners in City X noticed that many of the trees in the city were dying because of exposure to increased levels of air and water pollution. A study they commissioned revealed that sycamore trees actually thrive in environments with elevated levels of carbon monoxide, the main pollutant emitted by automobiles. In order to reverse the trend of dying trees, the city adopted a policy to replace all sick trees with sycamore trees.

Which of the following, if true, would most weaken the logic employed by the city planners?

A) In the forest, oak trees live an average of 70 years while sycamore trees only live for an average of 50 years.
B) Automobile manufacturers are developing newer car models that emit significantly fewer pollutants.
C) A survey by Urban Forests found that the sycamore is the most common tree in American cities.
D) The city recently installed low exhaust buses for its public transportation system.
E) Sycamore trees are extremely sensitive to sulfur dioxide, the main component of acid rain.


Bumping this thread. Can anyone point out what is the OA and OE for this one.
Is the OE
[Reveal] Spoiler:
E, to me C sounds valid as if Sycamore trees are already widely prevalent, and they are dying, then adding new Sycamore will not help.
Sulphur dioxide is not mentioned anywhere, it looks quite a big leap to assume that one of pollutants is Sulphur dioxide
Re: Planners in City X noticed that many of the trees in the   [#permalink] 30 Jun 2013, 04:19
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