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

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Senior Manager
Joined: 30 Jan 2016
Posts: 369

Kudos [?]: 269 [1], given: 97

Location: United States (MA)
For the last three years, entomologists have been searching for [#permalink]

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13 Jun 2017, 02:44
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Difficulty:

15% (low)

Question Stats:

80% (01:28) correct 20% (01:28) wrong based on 226 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
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!
[Reveal] Spoiler: OA

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Kudos [?]: 269 [1], given: 97

BSchool Forum Moderator
Joined: 26 Feb 2016
Posts: 1799

Kudos [?]: 821 [0], given: 22

Location: India
WE: Sales (Retail)
Re: For the last three years, entomologists have been searching for [#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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Kudos [?]: 821 [0], given: 22

Manager
Joined: 02 Aug 2013
Posts: 64

Kudos [?]: 10 [0], given: 80

Location: India
WE: Programming (Consulting)
Re: For the last three years, entomologists have been searching for [#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 .

Kudos [?]: 10 [0], given: 80

SVP
Joined: 12 Dec 2016
Posts: 1860

Kudos [?]: 167 [0], given: 2406

Location: United States
GMAT 1: 700 Q49 V33
GPA: 3.64
Re: For the last three years, entomologists have been searching for [#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.

Kudos [?]: 167 [0], given: 2406

Re: For the last three years, entomologists have been searching for   [#permalink] 19 Nov 2017, 20:08
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