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# For the last three years, entomologists have been searching

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Intern
Joined: 17 Sep 2011
Posts: 28
Location: United States
Followers: 2

Kudos [?]: 12 [1] , given: 2

For the last three years, entomologists have been searching [#permalink]  24 May 2012, 03:15
1
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Difficulty:

5% (low)

Question Stats:

92% (02:15) correct 7% (00:00) wrong based on 14 sessions
For the last three years, entomologists have been searching for a parasite to help control a whitefly that has recently become a serious crop pest. Believing this new pest to be a variety of sweet-potato whitefly, the entomologists confined their search to parasites of the sweet-potato whitefly. Genetic research now shows the new pest to be a distinct species, the silverleaf whitefly. Therefore, the search for a parasite has so far been wasted effort.

Which one of the following is an assumption on which the argument relies?

A) All varieties of the sweet-potato whitefly are serious crop pests.

B) If a crop pest has a parasite, that parasite can always be used to control that pest.

C) The chances of successfully identifying a useful parasite of the new pest have increased since the proper identification of the pest.

D) No parasite of the sweet-potato whitefly is also a parasite of the silverleaf whitefly.

E) In the last three years, the entomologists found no parasites of the sweet-potato whitefly.

Dont noe the answer..i chose D...
lets neagte the D...
NEGATION -at least one parasite of the sweet-potato whitefly is also a parasite of the silverleaf whitefly.
if yes then then search for a parasite has not been wasted effort.....and thus weakening the conclusion ...
Senior Manager
Joined: 28 Dec 2010
Posts: 336
Location: India
Followers: 1

Kudos [?]: 24 [0], given: 33

Re: sweet-potato whitefly [#permalink]  24 May 2012, 04:36
i agree imo D works. The conclusion is that the effort so far has been wasted. The assumption that we need to find is one that is required to meet this conclusion. In that respect A, B is irrelevant. C is completely opposite ot the conclusion. E is irrelevant to the new pest.
Manager
Joined: 02 Jun 2011
Posts: 159
Followers: 1

Kudos [?]: 12 [0], given: 11

Re: sweet-potato whitefly [#permalink]  24 May 2012, 06:18
i chose D. actualy got tied with B or D .
zeroed on D
Director
Joined: 24 Aug 2009
Posts: 513
Schools: Harvard, Columbia, Stern, Booth, LSB,
Followers: 7

Kudos [?]: 314 [0], given: 241

Re: For the last three years, entomologists have been searching [#permalink]  20 Apr 2013, 21:00
Explanation by Eli
When dissecting this problem, Kaplan recommends first identifying the author's conclusion--in this case, that the search has been "a wasted effort." Why has it been a wasted effort? Well, because they've been looking at sweet-potato parasites to kill a silverleaf whitefly.

So what's the gap? What's missing? Well, the author doesn't tell us why we've failed. If pests could cross species, we might well find a decent parasite, one that kills ALL whiteflies! But he is assuming this isn't the case--that no sweet-potato whitefly can help in the annhilation of the silverleaf whitefly.

(D), the answer that matches our prediction exactly.

OA is D
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Senior Manager
Status: struggling with GMAT
Joined: 06 Dec 2012
Posts: 315
Concentration: Accounting
GMAT Date: 04-06-2013
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Kudos [?]: 72 [0], given: 46

Re: For the last three years, entomologists have been searching [#permalink]  20 Apr 2013, 21:21
deepti1206 wrote:
For the last three years, entomologists have been searching for a parasite to help control a whitefly that has recently become a serious crop pest. Believing this new pest to be a variety of sweet-potato whitefly, the entomologists confined their search to parasites of the sweet-potato whitefly. Genetic research now shows the new pest to be a distinct species, the silverleaf whitefly. Therefore, the search for a parasite has so far been wasted effort.

Which one of the following is an assumption on which the argument relies?

A) All varieties of the sweet-potato whitefly are serious crop pests.

B) If a crop pest has a parasite, that parasite can always be used to control that pest.

C) The chances of successfully identifying a useful parasite of the new pest have increased since the proper identification of the pest.

D) No parasite of the sweet-potato whitefly is also a parasite of the silverleaf whitefly.

E) In the last three years, the entomologists found no parasites of the sweet-potato whitefly.

Dont noe the answer..i chose D...
lets neagte the D...
NEGATION -at least one parasite of the sweet-potato whitefly is also a parasite of the silverleaf whitefly.
if yes then then search for a parasite has not been wasted effort.....and thus weakening the conclusion ...

I picked D.I think D is the correct answer.
Re: For the last three years, entomologists have been searching   [#permalink] 20 Apr 2013, 21:21
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