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

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Already discussed at the below thread: cr-74667.html A [#permalink]

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New post 07 Aug 2010, 02:27
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A
B
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E

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Question Stats:

59% (02:46) correct 41% (01:48) wrong based on 164 sessions

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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
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[Reveal] Spoiler: OA

Last edited by reto on 03 Jul 2015, 06:56, edited 2 times in total.
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Re: Already discussed at the below thread: cr-74667.html A [#permalink]

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New post 07 Aug 2010, 09:13
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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: Already discussed at the below thread: cr-74667.html A [#permalink]

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New post 18 Aug 2010, 00:55
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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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: Already discussed at the below thread: cr-74667.html A [#permalink]

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New post 18 Aug 2010, 02:29
GOT TO BE E
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Re: Already discussed at the below thread: cr-74667.html A [#permalink]

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New post 07 Sep 2010, 03:00
IMO E
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Re: Already discussed at the below thread: cr-74667.html A [#permalink]

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Re: Already discussed at the below thread: cr-74667.html A [#permalink]

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New post 20 Jan 2016, 08:36
Conclusion:
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.

(A) There is not an alternative method, besides application of this fungicide, for eliminating powdery mildew from rose plants without harming the plants. - negation - There is an alternate method for .... - This does not affect the argument. The argument concludes that fungicide provides a means and not the only means.
(B) When the fungicide is sufficiently diluted, it does not present any risk of harm to people, animals, or beneficial insects. - The conclusion states that Fungicide provides a means of eliminating powdery mildew from rose plants that involves no risk of harming PLANTS. It does not talk about animals, people or other beneficial insects
(C) Powdery mildew is the only fungal infection that affects rose plants. - negation - It is not the only infection - Does not affect the argument. Same as A.
(D) If a fungicide is to be effective against powdery mildew on rose plants, it must eliminate the powdery mildew completely. - This is tricky. But the arguments states that it provides a means and not claims to be the best to eliminate completely
(E) The effectiveness of the fungicide does not depend on its being more concentrated than one part in ten parts of water. - Correct- The argument states the Dil Fungicide is harmless and Fungicide eliminates powdery mildew.
negation - The fungicide is effective when the concentration is more - implies that it will not be a means to eliminate mildew - T His affects the argument
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Re: Already discussed at the below thread: cr-74667.html A [#permalink]

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New post 15 Oct 2016, 07:56
My 2 cents:


(A) There is not an alternative method, besides application of this fungicide, for eliminating powdery mildew from rose plants without harming the plants.
No relevance to the conclusion which talks about effectiveness of a specific fungicide.
(B) When the fungicide is sufficiently diluted, it does not present any risk of harm to people, animals, or beneficial insects.
The conclusion focuses on effectiveness of the experimental fungicide and not its health hazards.
(C) Powdery mildew is the only fungal infection that affects rose plants.
May or may not be true. It is not the assumption on which conclusion is based.
(D) If a fungicide is to be effective against powdery mildew on rose plants, it must eliminate the powdery mildew completely.
The experimental fungicide has the capacity to eliminate it completely. The question never mentions that in order to be effective, the fungicide should eliminate the mildew completely.
(E) The effectiveness of the fungicide does not depend on its being more concentrated than one part in ten parts of water.
Part of pre-thinking. The first part says that when diluted it is not harmful to garden plants. Second part says that it is effective to eliminate completely the mildew but does not mention if the fungicide is diluted or concentrated etc. This is an assumption that even when diluted it is still effective. Negating E, conc falls apart.
Re: Already discussed at the below thread: cr-74667.html A   [#permalink] 15 Oct 2016, 07:56
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