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Help me to explain this question

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Help me to explain this question [#permalink] New post 20 Sep 2008, 21:38
Capuchin monkeys often rub their bodies with certain type of millipede. Laboratory tests show that secretions from the bodies of these millipedes are rich into two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate capuchins. Some scientists hypothesize that the monkey rub their bodies with the millipedes because doing so helps protect them from mosquitoes.

Which of the following, if true, provides the most support for the scientists' hypothesis?

A. A single millipede often gets passed around among several capuchins, all of whom rub their bodies with it.

B. The two chemicals that repel mosquitoes also repel several other varieties of insects.

C. The capuchins rarely rub their bodies with the millipedes except during the rainy season, when mosquito populations are at the peak.

D. Although the capuchins eat several species of insects, they do not eat the type of millipede they use to rub their bodies.

E. The two-insect-repelling chemicals in the secretion of the millipedes are carcinogenic for humans but do not appear to be carcinogenic for capuchins.

I chose C, but the correct one I referred is E. I don't understand clearly. May any one help me to explain this?
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Re: Help me to explain this question [#permalink] New post 21 Sep 2008, 17:54
anngoc wrote:
Capuchin monkeys often rub their bodies with certain type of millipede. Laboratory tests show that secretions from the bodies of these millipedes are rich into two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate capuchins. Some scientists hypothesize that the monkey rub their bodies with the millipedes because doing so helps protect them from mosquitoes.

Which of the following, if true, provides the most support for the scientists' hypothesis?

A. A single millipede often gets passed around among several capuchins, all of whom rub their bodies with it. -> irreleant no mention of msquitoes

B. The two chemicals that repel mosquitoes also repel several other varieties of insects. -> this weakens since milipedes can be used for other purposes

C. The capuchins rarely rub their bodies with the millipedes except during the rainy season, when mosquito populations are at the peak.
-> this strengthens the hyp.saying they need milipdes when mosquitoes are high in numbers

D. Although the capuchins eat several species of insects, they do not eat the type of millipede they use to rub their bodies. -> this is generic statement Eliminate

E. The two-insect-repelling chemicals in the secretion of the millipedes are carcinogenic for humans but do not appear to be carcinogenic for capuchins. -> IRRELEVANT out of context . how does it matter if they are carcenogenic or not

I chose C, but the correct one I referred is E. I don't understand clearly. May any one help me to explain this?


I dont agree with E
Clearly its C

Hypothesis: the monkey rub their bodies with the millipedes because doing so helps protect them from mosquitoes.

We need to go for the option that strengthens this !!C does this ,it says when mosquito population is at peak they rub their bodies with milipedes!!!

Whats the OA and also source of this question !!!
looking forward to discussing more on this !!
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Re: Help me to explain this question [#permalink] New post 21 Sep 2008, 18:03
IMO C.

E is Out of Scope.
Re: Help me to explain this question   [#permalink] 21 Sep 2008, 18:03
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