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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]

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19 Mar 2011, 03:39
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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.

OA is provided. I am not convinced about it though.
[Reveal] Spoiler:
Why not C? Infact the stimulus never mentions anything about acid rain so isn't E out of scope.
[Reveal] Spoiler: OA
If you have any questions
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Re: Sycamore trees and pollution [#permalink]

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19 Mar 2011, 08:25
a) In the forest, oak trees live an average of 70 years while sycamore trees only live for an average of 50 years.
Irrelevent. Trees can be replanted at the end of 50 years.
b) Automobile manufacturers are developing newer car models that emit significantly fewer pollutants.
Irrelevent. No one knows will it lead to low pollution levels, i.e. numbers of cars may grow, polluting agents can be different from cars, who knows?
c) A survey by Urban Forests found that the sycamore is the most common tree in American cities.
Irrelevent. The fact that it is the most common tree does not affect the argument i.e. it does not reflect whether it will be suitable for City X as well.
d) The city recently installed low exhaust buses for its public transportation system.
Same as B.
e) Sycamore trees are extremely sensitive to sulfur dioxide, the main component of acid rain.
Clearly demonstrates that the plan by city planners will not succeed. Acid rain, a by-product of pollution, may kill these trees. Though acid rain is not discussed but its relation with pollution is a basic knowledge, i.e. anyone hoping to do an mba should know it.
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Re: Sycamore trees and pollution [#permalink]

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19 Mar 2011, 08:34
The reason I did not choose E is - In CR & RC I thought we are expected to use information and data provided in the question and not from outside. Infact outside information can be used to eliminate choices.

As for C - Since it says they are common trees I went with the deduction that the sick trees also include sycamore trees and hence planting them again will not help.
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Re: Sycamore trees and pollution [#permalink]

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20 Mar 2011, 06:38
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I attended session with Ron purewal. He told outside the scope is good weakner. Hope that helps.

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Re: Planners in City X noticed that many of the trees in the [#permalink]

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21 Feb 2014, 18:56
this OA is debatable. Acid rain is never mentioned. What if the city under consideration has scanty rainfall?
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Re: Sycamore trees and pollution [#permalink]

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28 Feb 2014, 04:05
suchoudh wrote:
a) In the forest, oak trees live an average of 70 years while sycamore trees only live for an average of 50 years.
Irrelevent. Trees can be replanted at the end of 50 years.
b) Automobile manufacturers are developing newer car models that emit significantly fewer pollutants.
Irrelevent. No one knows will it lead to low pollution levels, i.e. numbers of cars may grow, polluting agents can be different from cars, who knows?
c) A survey by Urban Forests found that the sycamore is the most common tree in American cities.
Irrelevent. The fact that it is the most common tree does not affect the argument i.e. it does not reflect whether it will be suitable for City X as well.
d) The city recently installed low exhaust buses for its public transportation system.
Same as B.
e) Sycamore trees are extremely sensitive to sulfur dioxide, the main component of acid rain.
Clearly demonstrates that the plan by city planners will not succeed. Acid rain, a by-product of pollution, may kill these trees. Though acid rain is not discussed but its relation with pollution is a basic knowledge, i.e. anyone hoping to do an mba should know it.

Here the relation of acid rain is not something which is a basic knowledge...acid rain is related to water pollutants...thus thousgh sycamore tress thrive on air pollutants they may surrender to water pollutants that is acid rain....so this weakesns the plan
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Planners in City X noticed that many of the trees in the [#permalink]

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09 Mar 2015, 00:27
nikhilsrl 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.

OA is provided. I am not convinced about it though.
[Reveal] Spoiler:
Why not C? Infact the stimulus never mentions anything about acid rain so isn't E out of scope.

I chose E because it seemed to be better than the other options although I do think that the option is like typical GMAT options.There is just too much of extra outside knowledge that we need to know before we choose E. GMAT passages typically do not expect us to have any extra knowledge of the subject discussed in the argument..but having said that I still think that E is a better option
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Re: Planners in City X noticed that many of the trees in the [#permalink]

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01 Jun 2016, 06:44
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?

BID :- Sycamore Trees will reverse the trend

Missing Info :- The Sycamore trees can take pollution of both Air and Water

Weakening Prephrase :- Since they already are resistant to Air CO, this has to be Water to weaken it

a) In the forest, oak trees live an average of 70 years while sycamore trees only live for an average of 50 years. :- Nope Irrelavant
b) Automobile manufacturers are developing newer car models that emit significantly fewer pollutants. :- 180 it strengthens, or rather more irrelevant
c) A survey by Urban Forests found that the sycamore is the most common tree in American cities. Irrelevant
d) The city recently installed low exhaust buses for its public transportation system. Good for city still it has some pollution
e) Sycamore trees are extremely sensitive to sulfur dioxide, the main component of acid rain. Yes this is it they cant stand the acid rain
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Re: Planners in City X noticed that many of the trees in the [#permalink]

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01 Jun 2016, 09:08
Sorry but still not convinced of how E is the OA.

Outside the scope is good weakener then Its clear that Acid rain also contains water or for that matter many more components other that sulphur dioxide,so it can be possible that those components negate the effect of Sulphur dioxide on Sycamore trees as nothing is told about the effect of water on Sycamore trees.

Moreover Increased water & air pollution are not the only reasons for Acid Rain.There are other factors as well like--

FYI even volcano eruption causes acid rain.

Sorry for being so harsh but the above explanations are not justifiale.Please provide OE.
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Re: Planners in City X noticed that many of the trees in the [#permalink]

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01 Jun 2016, 11:47
Premise 1:- 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.
Premise 2:- A study they commissioned revealed that sycamore trees actually thrive in environments with elevated levels of carbon monoxide, the main pollutant emitted by automobiles.
Conclusion : - In order to reverse the trend of dying trees, the city adopted a policy to replace all sick trees with sycamore trees.
.
Note the underlined portion of the premise. This being a weaken question, the stimulus is the suspect while all choices are true but only one would weaken the reasoning behind the conclusion, which is the premise.

a) In the forest, oak trees live an average of 70 years while sycamore trees only live for an average of 50 years. - The argument is about cities and also there is significant difference in nature of pollution in forest vs cities hence out of scope choice.
b) Automobile manufacturers are developing newer car models that emit significantly fewer pollutants. - They are developing but not yet tested and succeeded. Hence will not weaken the argument. Also note the underlined portion of the premise 1 as trees as susceptible to air and water pollution this point talks only about a remedy for air pollution.
c) A survey by Urban Forests found that the sycamore is the most common tree in American cities - This may strengthen the argument hence opposite answer eliminate it.
d) The city recently installed low exhaust buses for its public transportation system - Similar to choice (B) Also note the underlined portion of the premise 1 as trees as susceptible to air and water pollution this point talks only about a remedy for air pollution. hence eliminate.
e) Sycamore trees are extremely sensitive to sulfur dioxide, the main component of acid rain. - Perfect! This one weakens the argument. The argument states that Sycamore trees are resistant to a certain kind of air pollution but this statement says they are susceptible another kind of air/water pollution which is acid rain while they are resistant only to carbon monoxide. Correct Answer is this!

Choice E is the right one.
Re: Planners in City X noticed that many of the trees in the   [#permalink] 01 Jun 2016, 11:47
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