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Kate: The recent decline in numbers of the Tennessee

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Kate: The recent decline in numbers of the Tennessee [#permalink] New post 08 Jan 2012, 02:36
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Kate: The recent decline in numbers of the Tennessee...

Can anyone please explain why the answer is not B.......
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Re: Gmat prep CR1 [#permalink] New post 08 Jan 2012, 04:34
We have to weaken Scot's hypothesis.
Tennessee warbler is a bird dependent on dense covering in South America's coffee plantations and A points at another bird Baltimore Oriole which is similar to warbler and declining in numbers in South America's coffee plantations and it does not eat bud worms.
But B points at bud worms which are declining in North America and not in South America and most probably Warbler must be preying on something else in South,hence it cannot be B.
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Re: Gmat prep CR1 [#permalink] New post 08 Jan 2012, 18:06
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kotela wrote:
Can anyone please explain why the answer is not B.......


Hi Kotela,

In Weaken questions, there are 2 cases, either its a cause and effect or we have to hit the conclusion. In this case, we can see its a cause and effect reasoning that we have to hit. What Scott says is that because the population of budworms is declining, so the population of tenesse bird is declining. So A(budworms declining) -> B(tenesse declining). Now, we have to prove that even if A doesn't happen, B happens i.e. even if a bird is not dependent on A, that bird's numbers are also declining. So, A option wins.

Let me know if you need more clarification.

Thanks,
Amil
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Re: Gmat prep CR1 [#permalink] New post 11 Jan 2012, 05:26
amil wrote:
kotela wrote:
Can anyone please explain why the answer is not B.......


Hi Kotela,

In Weaken questions, there are 2 cases, either its a cause and effect or we have to hit the conclusion. In this case, we can see its a cause and effect reasoning that we have to hit. What Scott says is that because the population of budworms is declining, so the population of tenesse bird is declining. So A(budworms declining) -> B(tenesse declining). Now, we have to prove that even if A doesn't happen, B happens i.e. even if a bird is not dependent on A, that bird's numbers are also declining. So, A option wins.

Let me know if you need more clarification.

Thanks,
Amil


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Re: Gmat prep CR1 [#permalink] New post 11 Jan 2012, 07:50
The correct choice in Weaken questions will provide new information that makes the conclusion less likely. Amil has provided good explanation of why choice A is correct. Even if Choice A were not there, you can see that choice B does little to weaken Scott's claim.

Scott's Claim: A(budworms declining) -> B(Tennessee Warbler declining). Note this decline is at the source (in North America). While making this statement, Scott is claiming that the population of Tennessee Warbler is declining at the source because Tennessee Warbler does not get enough food at source. Note, that Scott does not say that the cause of decline of bud-worms is the same as the cause for decline of Tennessee Warbler.


What does choice B say?

Choice B states that the cause for decline of budworms (infection) does not "directly" impact Tennessee Warbler
However, Scott never claimed the above to be the case. He only claimed that Tennessee Warbler declined because budworm declined. Hence this new information does not weaken Scott's case.

What could be another correct choice?
Any answer choice that states that the population of Tennessee Warbler is healthy in North America would be a good choice. Hence a choice that stated that the population of Tennessee Warbler in North America at the beginning of the migration period this year was no different than that last year. - would be correct.
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Re: Gmat prep CR1   [#permalink] 11 Jan 2012, 07:50
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