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13 Jun 2017, 03:44
Kudos
Bookmarks
D
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Difficulty:
15%
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Question Stats:
80% (01:44) correct
21%
(02:08)
wrong
based on 600
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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
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
13 Jun 2017, 04:10
Kudos
Bookmarks
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)
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)
20 Jun 2017, 05:27
Kudos
Bookmarks
Akela
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 .
