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# S92-21

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Math Expert
Joined: 02 Sep 2009
Posts: 58453

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16 Sep 2014, 01:47
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Difficulty:

5% (low)

Question Stats:

81% (01:07) correct 19% (00:47) wrong based on 99 sessions

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A fatal disease caused by the parasite Encarsia formosa and spread by greenhouse whiteflies has already killed 50 percent of the cucumber crops planted on the Redfern farm, the largest cucumber producing farm in the northeastern United States. Trialeurodes vaporariorum kills the larvae of greenhouse whiteflies. In an effort to save the remaining cucumber crops on the farm, plant biologists plan to introduce Trialeurodes vaporariorum to the cucumber fields of Redfern farm.

Which of the following, if true about Trialeurodes vaporariorum, provides the strongest evidence that the plan will succeed?

A. It is spread by a type of earthworm that lives on the farm near greenhouse whiteflies' hatching sites.
B. It has been known to lay dormant in cucumber plants for five years or more before it begins to reproduce.
C. It spreads more slowly than Encarsia formosa under most conditions.
D. It does not destroy some commonly found subspecies of greenhouse whiteflies.
E. It has been known to kill wheat and barley crops by attacking their nutrient intake capabilities.

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Joined: 02 Sep 2009
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16 Sep 2014, 01:47
Official Solution:

A fatal disease caused by the parasite Encarsia formosa and spread by greenhouse whiteflies has already killed 50 percent of the cucumber crops planted on the Redfern farm, the largest cucumber producing farm in the northeastern United States. Trialeurodes vaporariorum kills the larvae of greenhouse whiteflies. In an effort to save the remaining cucumber crops on the farm, plant biologists plan to introduce Trialeurodes vaporariorum to the cucumber fields of Redfern farm.

Which of the following, if true about Trialeurodes vaporariorum, provides the strongest evidence that the plan will succeed?

A. It is spread by a type of earthworm that lives on the farm near greenhouse whiteflies' hatching sites.
B. It has been known to lay dormant in cucumber plants for five years or more before it begins to reproduce.
C. It spreads more slowly than Encarsia formosa under most conditions.
D. It does not destroy some commonly found subspecies of greenhouse whiteflies.
E. It has been known to kill wheat and barley crops by attacking their nutrient intake capabilities.

We want to strengthen the conclusion that a plan to introduce the organism Trialeurodes vaporariorum to the cucumber fields will succeed. This organism kills the larvae of greenhouse whiteflies, which cause a fatal disease that kills cucumber crops. The plan's goal is to save the cucumber crops. Therefore, evidence that Trialeurodes vaporariorum will effectively kill the larvae or the prevent the disease from infecting the crops will strengthen the conclusion.

Choice A supports the conclusion by providing evidence that the larvae of greenhouse whiteflies will be affected by the organism; if a worm spreads Trialeurodes vaporariorum to the larvae, it is more likely that greenhouse whiteflies will become infected with Trialeurodes vaporariorum, die, and cease to infect the cucumber plants.

Choice B weakens the argument by stating that the plan will take a long time to enact, and during this lag, the cucumber plants will continue to die.

Choice C states that under most conditions, Trialeurodes vaporariorum spreads more slowly than Encarsia formosa does. This does not strengthen the argument, because if anything, it reduces the chance that Trialeurodes vaporariorum will be effective.

Answer D states that Trialeurodes vaporariorum does not destroy some common subspecies of greenhouse whiteflies. Subspecies of greenhouse whiteflies are not mentioned and are outside of the scope of the argument; greenhouse whiteflies' subspecies may or may not infect cucumber crops.Furthermore, we want to strengthen the argument by giving evidence that the whiteflies WILL be killed.

Choice E is also outside the scope of the argument; the effect of Trialeurodes vaporariorum on other crops is irrelevant.

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13 Jan 2018, 22:37
Bunuel Skywalker18 sayantanc2k

Why is this mentioned as 700 level question in GMATClub mock test, whereas over here it is mentioned as 5% difficulty question???
Re: S92-21   [#permalink] 13 Jan 2018, 22:37
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# S92-21

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