CR- Verbal Review 2nd ed question 51 : GMAT Critical Reasoning (CR)
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# CR- Verbal Review 2nd ed question 51

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CR- Verbal Review 2nd ed question 51 [#permalink]

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19 Nov 2013, 17:25
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Hello , I am a little confused with the following question;

A company plans to develop a prototype weeding machine that uses cutting blades with optical sensors and microprocessors that distinguish weeds from crop plants by differences in shade of color. The inventor of the machine claims that it will reduce labor costs by virtually eliminating the need for manual weeding.

Which of the following is a consideration in favor of the company's implementing its plan to develop the prototype?

A. There is a considerable degree of variation in shade of color between weeds of different species.
B. The shade of color of some plants tends to change appreciably over the course of their growing season.
C. When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds.
D. Selection and genetic manipulation allow plants of virtually any species to be economically bred to have a distinctive shade of color without altering their other characteristics.
E. Farm laborers who are responsible for the manual weeding of crops carry out other agricultural duties at times in the growing season when extensive weeding is not necessary.

So, we have to find and answer to strengthen the conclusion
Conclusion: labor costs will be reduced by implementing a weeding machines which works by differentiating colors.

I do not understand why the correct answer is D. It is not completely clear the connection between the selection of genetic manipulation with the effectiveness of the prototype.

Thanks
[Reveal] Spoiler: OA
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Re: CR- Verbal Review 2nd ed question 51 [#permalink]

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19 Nov 2013, 18:48
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The weeding machine works to eliminate weeds based on color. It needs to distinguish the color of the weeds from those of other plants. Answer choice D states that basically any plant can be made to have a distinctive color. This ensures that these plants could be bred to have a color that the machine recognizes as NOT being a weed, and thus does not destroy the plant. This increases the effectiveness of the weeding machine by allowing it to work in areas with virtually any kind of plants.

I hope this helps!!!
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Re: CR- Verbal Review 2nd ed question 51 [#permalink]

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02 Dec 2013, 08:24
Narrowed it down to A & D and D sounded better to me. The machine distinguishes by differences in shade color.

A. There is variation in color which supports what the machine was designed to do.
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Re: CR- Verbal Review 2nd ed question 51 [#permalink]

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24 Dec 2013, 15:57
VeritasPrepBrandon wrote:
The weeding machine works to eliminate weeds based on color. It needs to distinguish the color of the weeds from those of other plants. Answer choice D states that basically any plant can be made to have a distinctive color. This ensures that these plants could be bred to have a color that the machine recognizes as NOT being a weed, and thus does not destroy the plant. This increases the effectiveness of the weeding machine by allowing it to work in areas with virtually any kind of plants.

I hope this helps!!!

Hi,
Could you please explain why A is wrong
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Re: CR- Verbal Review 2nd ed question 51 [#permalink]

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24 Dec 2013, 23:03
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Its not actually a strengthen question. It asks us to choose an option that supports the implementation of the plan by the company. The company's plan is to develop the prototype not to reduce labour costs.
Hence the option we are seeking should say,"Ok, its good to go ahead with the plan."
Now just look at D) which says "selection and genetic manipulation allow plants of virtually any species to be economically bred to have a distinctive shade of color without altering their other characteristics".
The machine operates by first distinguishing the color and then cutting the weeds which have a different shade.
Option D) clearly helps us to believe that if distinctive shade of color is possible without altering any other characteristics then the machine can very much be put to use. Hence the company should go ahead with its plan to develop the machine.
If this explanation helps please do not hesitate to give me kudos.
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Re: CR- Verbal Review 2nd ed question 51 [#permalink]

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25 Dec 2013, 12:25
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Sam1 wrote:
VeritasPrepBrandon wrote:
The weeding machine works to eliminate weeds based on color. It needs to distinguish the color of the weeds from those of other plants. Answer choice D states that basically any plant can be made to have a distinctive color. This ensures that these plants could be bred to have a color that the machine recognizes as NOT being a weed, and thus does not destroy the plant. This increases the effectiveness of the weeding machine by allowing it to work in areas with virtually any kind of plants.

I hope this helps!!!

Hi,
Could you please explain why A is wrong

A. There is a considerable degree of variation in shade of color between weeds of different species.

Whether there is a considerable degree of variation in shade of color between the weeds is irrelevant to the success of the company's plan. Even the slightest variation in shade of color that can distinguish weeds from plants would be sufficient to guarantee the plan's success. Hence choice A does not strengthen the argument.

Hope that is clear.
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Re: CR- Verbal Review 2nd ed question 51 [#permalink]

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13 May 2015, 05:12
Hello from the GMAT Club VerbalBot!

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Re: CR- Verbal Review 2nd ed question 51 [#permalink]

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25 Aug 2016, 03:23
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Re: CR- Verbal Review 2nd ed question 51   [#permalink] 25 Aug 2016, 03:23
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