Sigatoka disease drastically reduces the yield of banana : GMAT Critical Reasoning (CR)
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# Sigatoka disease drastically reduces the yield of banana

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Sigatoka disease drastically reduces the yield of banana [#permalink]

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20 May 2008, 06:42
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Sigatoka disease drastically reduces the yield of banana trees and is epidemic throughout the areas of the world where bananas are grown. The fungus that causes the disease can be controlled with fungicides, but the fungicides can pose a health hazard to people living nearby. The fungicides are thus unsuitable for small banana groves in populated areas. Fortunately, most large banana plantations are in locations so isolated that fungicides can be used safely there. Therefore, most of the world’s banana crop is not seriously threatened by Sigatoka disease.
Which one of the following is an assumption on which the argument depends?
(A) It will eventually be possible to breed strains of bananas that are resistant to Sigatoka disease.
(B) Large plantations produce most or all of the world’s bananas.
(C) Sigatoka disease spreads more slowly on large plantations than in small banana groves.
(D) Sigatoka disease is the only disease that threatens bananas on a worldwide scale.
(E) Most of the banana trees that have not been exposed to the Sigatoka fungus grow in small banana groves.

Any explanations...thanks...bepositive
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Re: CR--Sigatoka disease [#permalink]

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20 May 2008, 07:04
B.

The conclusion is most of the world's banana is not threatened by Sigatoka.
The premise is most large banana plantations can be safely sprayed to prevent Sigatoka.

So the missing assumption is that large banana plantations actually constitutes most of world's bananas.
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Re: CR--Sigatoka disease [#permalink]

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20 May 2008, 07:08
@zhenmaster

can you please explain each option individually..thanks!!

bepositive
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Re: CR--Sigatoka disease [#permalink]

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20 May 2008, 08:01
I vote for B
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Re: CR--Sigatoka disease [#permalink]

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20 May 2008, 09:59
bepositive wrote:
Sigatoka disease drastically reduces the yield of banana trees and is epidemic throughout the areas of the world where bananas are grown. The fungus that causes the disease can be controlled with fungicides, but the fungicides can pose a health hazard to people living nearby. The fungicides are thus unsuitable for small banana groves in populated areas. Fortunately, most large banana plantations are in locations so isolated that fungicides can be used safely there. Therefore, most of the world’s banana crop is not seriously threatened by Sigatoka disease.
Which one of the following is an assumption on which the argument depends?
(A) It will eventually be possible to breed strains of bananas that are resistant to Sigatoka disease.
(B) Large plantations produce most or all of the world’s bananas.
(C) Sigatoka disease spreads more slowly on large plantations than in small banana groves.
(D) Sigatoka disease is the only disease that threatens bananas on a worldwide scale.
(E) Most of the banana trees that have not been exposed to the Sigatoka fungus grow in small banana groves.

Any explanations...thanks...bepositive

B is correct. Because the fungi will only cured large banana plantations (as opposed to small plantations) and if most banana crop comes from large banana plantations, then the produce won't be affected.

A, C, D, E are irrelevant.
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Re: CR--Sigatoka disease [#permalink]

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20 May 2008, 10:15
Straight B. As the conclusion says that most of the banana planatation is not endangered from sigatoka disease. So If we assume that most banana grows in the large planation areas where fugicide can be sprayed the conclusion holds correct.
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Re: CR--Sigatoka disease [#permalink]

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20 May 2008, 11:33
why is D wrong?
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Re: CR--Sigatoka disease [#permalink]

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20 May 2008, 11:45
bepositive wrote:
Sigatoka disease drastically reduces the yield of banana trees and is epidemic throughout the areas of the world where bananas are grown. The fungus that causes the disease can be controlled with fungicides, but the fungicides can pose a health hazard to people living nearby. The fungicides are thus unsuitable for small banana groves in populated areas. Fortunately, most large banana plantations are in locations so isolated that fungicides can be used safely there. Therefore, most of the world’s banana crop is not seriously threatened by Sigatoka disease.
Which one of the following is an assumption on which the argument depends?
(A) It will eventually be possible to breed strains of bananas that are resistant to Sigatoka disease. irrelevant/out of scope
(B) Large plantations produce most or all of the world’s bananas. stems says that most large banana plantations are isolated and thus fungicides can be used, AND most of world's banana crop is not threathened. Hence this can be assumed
(C) Sigatoka disease spreads more slowly on large plantations than in small banana groves. irrelevant
(D) Sigatoka disease is the only disease that threatens bananas on a worldwide scale. irrelenvant/out of scope to this argument since other diseases aren't discussed
(E) Most of the banana trees that have not been exposed to the Sigatoka fungus grow in small banana groves. this is not a fair assumption since if a few large plantations can still be "untouched" by Sigatoka disease.

Any explanations...thanks...bepositive

so i go for B.

on a lighter note, i've been to Sigatoka (pronounced Singatoka), which is a nice beachy area of Fiji
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Re: CR--Sigatoka disease [#permalink]

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20 May 2008, 17:44
B for sure
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Re: CR--Sigatoka disease [#permalink]

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20 May 2008, 21:17
Another vote for B.
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Re: CR--Sigatoka disease [#permalink]

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20 May 2008, 21:56
i concur with freshina - kind of like really D, is it really not the OA?
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Re: CR--Sigatoka disease [#permalink]

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20 May 2008, 23:29
bkk145 wrote:
B is correct. Because the fungi will only cured large banana plantations (as opposed to small plantations) and if most banana crop comes from large banana plantations, then the produce won't be affected.

A, C, D, E are irrelevant

If i got it on the D-day, I will lost the way. This really tricky! The second thougt made me understand the trick of this question.

Thank bepositive!
+1 for you

bkk145 wrote:
most large banana plantations are in locations so isolated that fungicides can be used safely there. Therefore, most of the world’s banana crop is not seriously threatened by Sigatoka disease

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Re: CR--Sigatoka disease [#permalink]

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25 May 2008, 04:04
OA ?
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Re: CR--Sigatoka disease [#permalink]

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25 May 2008, 13:10
straight B.
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Re: CR--Sigatoka disease [#permalink]

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25 May 2008, 15:33
B,

only when we assume most of the world's production of bananas are in the large plantations, we can conclude that the world production will not be affected by fungicide.
Re: CR--Sigatoka disease   [#permalink] 25 May 2008, 15:33
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# Sigatoka disease drastically reduces the yield of banana

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