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For the last three years, entomologists have been searching for

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

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New post 13 Jun 2017, 02:44
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D
E

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

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

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

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

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New post 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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For the last three years, entomologists have been searching for

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