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Already discussed at the below thread: cr-74667.html A

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Senior Manager
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Already discussed at the below thread: cr-74667.html A [#permalink] New post 07 Aug 2010, 01:27
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A
B
C
D
E

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  45% (medium)

Question Stats:

60% (03:02) correct 40% (01:14) wrong based on 10 sessions
Already discussed at the below thread:
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A certain experimental fungicide causes no harm to garden plants, though only if it is diluted at least to ten parts water to one part fungicide. Moreover, this fungicide is known to be so effective against powdery mildew that it has the capacity to eliminate it completely from rose plants. Thus this fungicide, as long as it is sufficiently diluted, provides a means of eliminating powdery mildew from rose plants that involves no risk of harming the plants.
Which one of the following is an assumption on which the argument depends?
(A) There is not an alternative method, besides application of this fungicide, for eliminating powdery mildew from rose plants without harming the plants.
(B) When the fungicide is sufficiently diluted, it does not present any risk of harm to people, animals, or beneficial insects.
(C) Powdery mildew is the only fungal infection that affects rose plants.
(D) If a fungicide is to be effective against powdery mildew on rose plants, it must eliminate the powdery mildew completely.
(E) The effectiveness of the fungicide does not depend on its being more concentrated than one part in ten parts of water.

I am still not able to get this CR ques. An easier to understand answer needed :oops
[Reveal] Spoiler: OA
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Re: experimental fungicide [#permalink] New post 07 Aug 2010, 08:13
Yes this one is hard. Because B is so tempting. But mark the keywords "harm"

Conclusion says that the method does NOT harm the plants. B says that its does NOT harm people, animals etc. Negate B - it does not affect the conclusion.

(B) When the fungicide is sufficiently diluted, it does not present any risk of harm to people, animals, or beneficial insects.

Now look at E. Argument says that one part in ten parts water concentration is ATLEAST required to cause the desired effect. Premise - A certain experimental fungicide causes no harm to garden plants, though only if it is diluted at least to ten parts water to one part fungicide. ---> More concentration is worthless.
(E) The effectiveness of the fungicide does not depend on its being more concentrated than one part in ten parts of water. Hence E is the answer.
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Re: experimental fungicide [#permalink] New post 17 Aug 2010, 23:55
OK after a horrendous CAT yesterday, m happy i got this one right :-) its got to be E..>Was down to D and E and I happily choose E!!!
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Re: experimental fungicide [#permalink] New post 18 Aug 2010, 01:23
E it is.

The argument say that the Fungi is effective against Mildew. But to apply it safely, we can only use diluted Fungi, so the assumption has to be that the diluted Fungi is also as effective against Mildew.
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Re: experimental fungicide [#permalink] New post 18 Aug 2010, 01:29
GOT TO BE E
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Re: experimental fungicide [#permalink] New post 07 Sep 2010, 02:00
IMO E
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Re: experimental fungicide   [#permalink] 07 Sep 2010, 02:00
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