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# For the last three years, entomologists have been searching for a para

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Director
Joined: 30 Jan 2016
Posts: 883
Location: United States (MA)
For the last three years, entomologists have been searching for a para  [#permalink]

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13 Jun 2017, 02:44
1
3
00:00

Difficulty:

15% (low)

Question Stats:

80% (01:46) correct 20% (02:16) wrong based on 280 sessions

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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.

Source: LSAT

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Re: For the last three years, entomologists have been searching for a para  [#permalink]

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13 Jun 2017, 03:10
As per my understanding of the argument, for the last 3 years,
entomologists searched for a parasite to help control "a sweet-potato whitefly"
Since genetic research confirms the species to be a silverleaf whitefly(not a sweet-potato whitefly)
and the conlusion is that the search for a parasite has so far been a wasted effort,
the assumption could be that
neither of the parasites of the sweet-potato whitefly is also a parasite of the silverleaf whitefly also.

Since negating this statement can break the conclusion(Option D)
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Manager
Joined: 02 Aug 2013
Posts: 65
Location: India
WE: Programming (Consulting)
Re: For the last three years, entomologists have been searching for a para  [#permalink]

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20 Jun 2017, 04:27
Akela 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
silverfleaf 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.

Source: LSAT

Kudos!

IMO : Option D

entomologists researching on variety of sweet-potato whitefly BUT they have found a different species silverleaf whitefly.

Assumption : sweet-potato whitefly NOT EQ TO silverleaf whitefly .
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Posts: 1608
Location: United States
GMAT 1: 700 Q49 V33
GPA: 3.64
Re: For the last three years, entomologists have been searching for a para  [#permalink]

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19 Nov 2017, 20:08
although this is a LSAT question, the pattern in A,D,E are important, and often appear in gmat questions.
Test takers should know this.
Manager
Joined: 21 Jan 2018
Posts: 50
Location: India
GPA: 2.85
WE: Consulting (Consulting)
Re: For the last three years, entomologists have been searching for a para  [#permalink]

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15 Mar 2018, 19:44
IMO - D
No parasite of the sweet-potato whitefly is also a parasite of the silverleaf whitefly.

Negate : Efforts will not be wasted if the parasites are common for Sweet Potato and silverleaf Whiteflies.
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Manager
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Joined: 28 Sep 2016
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Location: India
Re: For the last three years, entomologists have been searching for a para  [#permalink]

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16 Mar 2018, 01:17
IMO D.

Only D links Sweet Potato and silverleaf Whiteflies.
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VP
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Re: For the last three years, entomologists have been searching for a para  [#permalink]

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29 Mar 2018, 04:06
abhimahna 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.

Source: LSAT

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.

(D)
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Director
Joined: 26 Aug 2016
Posts: 612
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GMAT 2: 700 Q50 V33
GMAT 3: 730 Q51 V38
GPA: 4
WE: Information Technology (Consulting)
Re: For the last three years, entomologists have been searching for a para  [#permalink]

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15 Apr 2018, 03:01
3
Hi bb and GMATNinja ,
This question is already available. Please merge the topics. Doing so will help us to track the comments and various algorithms for solving the question.

Thank you
Founder
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GMAT 1: 750 Q49 V42
GPA: 3.5
Re: For the last three years, entomologists have been searching for a para  [#permalink]

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15 Apr 2018, 06:52
Nightmare007 wrote:
Hi bb and GMATNinja ,
This question is already available. Please merge the topics. Doing so will help us to track the comments and various algorithms for solving the question.

Thank you

Thanks Topics Merged.
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Re: For the last three years, entomologists have been searching for a para &nbs [#permalink] 15 Apr 2018, 06:52
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