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01 Jun 2016, 06:44
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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?
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
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
01 Jun 2016, 09:08
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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.
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.
01 Jun 2016, 11:47
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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.
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.
