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Although dried roots in well-watered orchids are caused primarily by t

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Although dried roots in well-watered orchids are caused primarily by t [#permalink]

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Question Stats:

61% (01:40) correct 39% (01:52) wrong based on 66 sessions

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Although dried roots in well-watered orchids are caused primarily by the deficiency of a chemical compound called Vitadex, researchers believe that the presence of Ditalex in the soil could also be a cause of the same. Traces of Ditalex were found in 70 percent of the orchids with dried roots, but in only 10 percent of the orchids without dried roots. Ditalex was accidentally added to a few pesticides last year and researchers hypothesize that these affected orchids are from farms that once used this particular batch of pesticides.
Which of the following, if true, most strongly supports the researchers’ hypothesis?


A) Regulations in the pesticides manufacturing industry have now banned the usage of Ditalex.

B)Recently tested samples of the pesticides used last year have revealed traces of Ditalex.

C)On farms where the infected pesticide was never used, the samples of orchids that had dried roots did not contain Ditalex.

D)In some cases, orchids exposed to Ditalex are not affected by dried roots.

E)There is no direct proof that dried roots are primarily caused by Vitadex.
[Reveal] Spoiler: OA

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Re: Although dried roots in well-watered orchids are caused primarily by t [#permalink]

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New post 13 Aug 2017, 12:14
srikanth9502 wrote:
Although dried roots in well-watered orchids are caused primarily by the deficiency of a chemical compound called Vitadex, researchers believe that the presence of Ditalex in the soil could also be a cause of the same. Traces of Ditalex were found in 70 percent of the orchids with dried roots, but in only 10 percent of the orchids without dried roots. Ditalex was accidentally added to a few pesticides last year and researchers hypothesize that these affected orchids are from farms that once used this particular batch of pesticides.
Which of the following, if true, most strongly supports the researchers’ hypothesis?


A) Regulations in the pesticides manufacturing industry have now banned the usage of Ditalex.

B)Recently tested samples of the pesticides used last year have revealed traces of Ditalex.

C)On farms where the infected pesticide was never used, the samples of orchids that had dried roots did not contain Ditalex.

D)In some cases, orchids exposed to Ditalex are not affected by dried roots.

E)There is no direct proof that dried roots are primarily caused by Vitadex.

B?

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Re: Although dried roots in well-watered orchids are caused primarily by t [#permalink]

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New post 13 Aug 2017, 13:00
B in my opinion.

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Re: Although dried roots in well-watered orchids are caused primarily by t [#permalink]

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New post 13 Aug 2017, 13:02
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X causes Y
Z also causes Y
researcher says Z causes Y
to strengthen No cause no effect is one way ... C

C clearly says effect is not because of infected pesticide

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Re: Although dried roots in well-watered orchids are caused primarily by t   [#permalink] 13 Aug 2017, 13:02
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