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A certain experimental fungicide causes no harm to garden plants, thou

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A certain experimental fungicide causes no harm to garden plants, thou  [#permalink]

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New post 10 Dec 2018, 21:53
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49% (02:09) correct 51% (02:25) wrong based on 247 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.

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Re: A certain experimental fungicide causes no harm to garden plants, thou  [#permalink]

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New post 13 Dec 2018, 05:33
Bunuel wrote:
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.


Premises:
- Fungicide causes no harm if diluted 10:1.
- Fungicide eliminates powdery mildew completely from rose plants


Conclusion:
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.
(sounds fair! Let's look at the options for assumptions)

(A) There is not an alternative method, besides application of this fungicide. for eliminating powdery mildew from rose plants without harming the plants.

The argument does not say that there are no other such methods. It just says that this fungicide is such a method. Not correct.

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

Harm to people, animals etc is irrelevant for our argument. We are concluding about safety to the rose plants only.

(C) Powdery mildew is the only fungal infection that affects rose plants.

Other fungal infections are irrelevant to our argument. We are concluding about powdery mildew only.

(D) If a fungicide is to be effective against powdery mildew on rose plants, it must eliminate the powdery mildew completely.

The argument does not talk about "effectiveness". It talks about eliminating powdery mildew in both premises and conclusion.

(E) The effectiveness of the fungicide does not depend on its being more concentrated than one part in ten parts of water.

Correct. It is safe when it is diluted 10:1. It is effective in completely eliminating mildew but it is effective when diluted 10:1? We are assuming that effectiveness does not reduce when diluted so much. Hence this is the answer.

Answer (E)
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Re: A certain experimental fungicide causes no harm to garden plants, thou  [#permalink]

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New post 12 Dec 2018, 09:15
Choice E is the winner because the argument says the 10:1 ratio is necessary to keep the fungi from harmfully impacting other plants. If you negate E and there is something else that is important to preventing other plants from being impacted, the conclusion of the fungi just being sufficiently diluted to protect other plants falls apart because there are possible other requirements now.
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Re: A certain experimental fungicide causes no harm to garden plants, thou  [#permalink]

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New post 12 Dec 2018, 12:10
gmatconqueror2018 wrote:
Choice E is the winner because the argument says the 10:1 ratio is necessary to keep the fungi from harmfully impacting other plants. If you negate E and there is something else that is important to preventing other plants from being impacted, the conclusion of the fungi just being sufficiently diluted to protect other plants falls apart because there are possible other requirements now.

Exactly, so try to negate option (E)

The effectiveness of the fungicide depends on its being more concentrated than one part in ten parts of water.

Now, check the stimulus -

Quote:
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.


Thus, negating option (E) makes the conclusion fall apart....
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Re: A certain experimental fungicide causes no harm to garden plants, thou  [#permalink]

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New post 02 Feb 2019, 23:07
A is irrelevant. B restates information already in the passage but also includes new information, so it is definitely out. C is irrelevant and even if it is not true, the passage only says that the fungicide can eliminate powdery mildew, the argument does not collapse. D is out of scope. So E is the right answer. The argument says that the fungicide must be diluted to this ratio, so we need to assume that this will not be an impediment to its effectiveness. If E was not true then this fungicide could not be effective
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Re: A certain experimental fungicide causes no harm to garden plants, thou   [#permalink] 02 Feb 2019, 23:07
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