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In the arid land along the Colorado River, use of the

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In the arid land along the Colorado River, use of the [#permalink] New post 14 Aug 2009, 16:50
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Question Stats:

86% (02:14) correct 14% (01:09) wrong based on 161 sessions
Official Guide for GMAT Verbal Review, 2nd Edition

Practice Question
Question No.: 22
Page: 123
Difficulty:


In the arid land along the Colorado River, use of the river's water is strictly controlled: farms along the river each have a limited allocation that they are allowed to use for irrigation. But the trees that grow in narrow strips along the river’s banks also use its water. Clearly, therefore, if farmers were to remove those trees, more water would be available for crop irrigation

Which of the following, if true, most seriously weakens the argument?


a. The trees along the river’s banks shelter it from the sun and wind, thereby greatly reducing the amount of water lost through evaporation
b. Owners of farms along the river will probably not undertake the expense of cutting down trees along the banks unless they are granted a greater allocation of water in return
c. Many of the tree species currently found along the river’s banks are specifically adapted to growing in places where tree roots remain constantly wet.
d. The strip of land where trees grow along the river’s banks would not be suitable for growing crops if the trees were removed.
e. The distribution of water allocations for irrigation is intended to prevent farms father upstream from using water needed by farms father downstream
[Reveal] Spoiler: OA

Last edited by Narenn on 16 Oct 2013, 06:19, edited 1 time in total.
Necessary Corrections for Official Guide Verbal Review 2nd Edition Project
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Re: water allocation [#permalink] New post 14 Aug 2009, 17:06
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Answer is A

Conclusion :Clearly, therefore, if farmers were to remove those trees, more water would be available for crop irrigation

So, answer should be the one where emphasis is on water saving

a. The trees along the river’s banks shelter it from the sun and wind, thereby greatly reducing the amount of water lost through evaporation
A fits nicely

Why D is not the answer:-
It talks about more area for crop and not about water and does not weaken the conclusion
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Re: water allocation [#permalink] New post 14 Aug 2009, 22:30
Dear yyc881123, would appreciate if you post the OA after people post their explanations so that everyone can benefit.
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Re: In the arid land along the Colorado River, use of the [#permalink] New post 19 Mar 2012, 18:56
I have chosen A for this question:

The conclusion is: [highlight]If farmers were to remove the trees, more water would be available for crop irrigation.[/highlight]

When I first read the passage, I knew that the question would ask for an answer choice to weaken the argument. If you look at the argument, the reasoning is clearly flawed - just by removing the trees, the author is assuming that the total amount of water available would suddenly increase. There are other factors that the author has not considered - this leads me to my prephrases:

1. The water could migrate elsewhere. For example, maybe the water would move into the voids that the trees have left, or maybe the water would move into other porous spaces.
2. The water may evaporate quicker without the shade of the trees.

Now look at each answer choice:

A. This answer choice looks like one of my prephrases. After careful review of the other choices, this is the answer I chose.

B. The argument has already stated "if farmers were to remove the trees...", so this answer choice already does not make sense because it is assumed in the passage. Also, this answer choice doesn't talk about an increase in the total amount of water, instead it talks about whether the farmers will cut down the trees.

C. This actually supports the argument because it states that these trees constantly have wet roots, so these trees probably consume more water than normal. Therefore, this answer choice is incorrect.

D. We are not concerned about whether the land is prime for farming or not - this answer choice is irrelevant.

E. This answer choice talks about the distribution of the total water, and not about whether the total water will increase or decrease once the trees are removed. Therefore, this answer cannot be correct.
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Re: In the arid land along the Colorado River, use of the [#permalink] New post 19 Mar 2012, 22:08
A goes the best among others
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Re: In the arid land along the Colorado River, use of the [#permalink] New post 20 Mar 2012, 03:00
IMO A......... Very nice though
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Re: In the arid land along the Colorado River, use of the [#permalink] New post 20 Mar 2012, 03:18
Hi,

Even i fell for D. Its a very good example of the "EGG SHELL GAME" the GMAT loves to play.

The trick is to identify that D - "The strip of land where trees grow along the river’s banks would not be suitable for growing crops if the trees were removed. " limits the argument to only the strip of land near the river

The argument can be weakened to a greater extent if the benefit of having the trees along the river bank could be felt over a larger area. This is clearly seen in A

Hence A is correct
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Re: In the arid land along the Colorado River, use of the [#permalink] New post 20 Mar 2012, 10:13
A clearly weaken the conclusion "if farmers were to remove those trees, more water would be available for crop irrigation
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Re: In the arid land along the Colorado River, use of the [#permalink] New post 24 Mar 2014, 16:17
yyc881123 wrote:
Official Guide for GMAT Verbal Review, 2nd Edition

Practice Question
Question No.: 22
Page: 123
Difficulty:


In the arid land along the Colorado River, use of the river's water is strictly controlled: farms along the river each have a limited allocation that they are allowed to use for irrigation. But the trees that grow in narrow strips along the river’s banks also use its water. Clearly, therefore, if farmers were to remove those trees, more water would be available for crop irrigation

Which of the following, if true, most seriously weakens the argument?


a. The trees along the river’s banks shelter it from the sun and wind, thereby greatly reducing the amount of water lost through evaporation
b. Owners of farms along the river will probably not undertake the expense of cutting down trees along the banks unless they are granted a greater allocation of water in return
c. Many of the tree species currently found along the river’s banks are specifically adapted to growing in places where tree roots remain constantly wet.
d. The strip of land where trees grow along the river’s banks would not be suitable for growing crops if the trees were removed.
e. The distribution of water allocations for irrigation is intended to prevent farms father upstream from using water needed by farms father downstream

Please clear my doubt : The trees along the river’s banks shelter it from the sun and wind, thereby greatly reducing the amount of water lost through evaporation : So I concluded from this sentence that if we remove the trees then a great amount of water would be lost through evaporation but in the same case we would have more water for crop irrigation.So let's suppose we have 100 ml of more water available for irrigation and 99 ml is evaporated then also we will have extra 1 ml for growing crops and this 1 ml will be enough to get to our conclusion.I know this is a far fetched conclusion but I want to clear my thought process on this.
Re: In the arid land along the Colorado River, use of the   [#permalink] 24 Mar 2014, 16:17
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