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A company plans to develop a prototype weeding machine that

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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 15 Oct 2013, 17:30
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.


I initially picked A but just realised that it was a trap. differences in color shade AMONG WEEDS doesn't matter much here... I switched to D
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 07 Nov 2013, 00:16
The problem with A is that it makes no mention of the relative shades of the weeds and crop plants in a particular crop.
It traps us into believing that the comparison is between the shade of weeds and crop plants, but in reality it talks about variation in shades of different weed species.

D is the right answer. It says how the crops can be economically modified (increase shade variation between weed and crop plants) to make the machine's work easier thereby eliminating manual weeding (obviously saves costs and time with little investment).
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A company plans to develop a prototype weeding machine that [#permalink]

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New post 27 Feb 2015, 03:25
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Reasoning: a prototype with optical sensors and microprocessors can distinguish weeds from crop plants by differences in shade of color.

Prethinking:
--> So, the bigger the diff. in shade of color between weeds and crop, the easier it will be for a mashine to distinguish between them.
--> fewer colors of weeds > many colors for the mashine to ba able to distinguish between weeds and crop.

Question Type: Strengthen --> so, new information is appreciated here


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 --> weakens the argument - see the reasoning stated above
B. The shade of color of some plants tends to change appreciably over the course of their growing season --> is it easier for mashine to make a distinction it this case ? NO.
C. When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds --> irrelevant. We are concerned about the shade of color. Actually, it's a weakener.... more factors that must be distiguished by the mashine.
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 --> CORRECT. Distinctive shade of color makes it easier for the mashine to make such distinction.
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 --> irrelevat. "Zero" information about the mashines and a distinction....
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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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. - Variation in shades of color weakens the conclusion.
B. The shade of color of some plants tends to change appreciably over the course of their growing season - Same as A
C. When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds. - When considering prototype machine, manual weeding should not come into picture. Weakens the solution.
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. - Prototype machine will easily remove distinctive single color weed from crop. Strengthen the conclusion.
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. - This is just an assumption.


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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 10 Aug 2015, 06:00
Meaning of the argument:
There is a machine which can cut weeds based on the difference between the color of weeds and the color of leaves. This would lead to reduction in labor costs. Which fact is true would ensure that the company's plan is successful i.e plan that the machine would work well and that it would reduce labor costs.

A. There is a considerable degree of variation in shade of color between weeds of different species. So what? The machine needs to compare weeds and leaves.
B. The shade of color of some plants tends to change appreciably over the course of their growing season.So what again..The plants may change to look like the weeds
C. When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds. Out of scope. We are concerned with a contrast between the colors of the leaf and the weed
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. if this were true and in place, then finding a difference between the colors of the weed and the plant would be easy. A very audacious assumption, but it is an assumption which if true would be a proponent to the company's plan
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. Out of scope, as the argument does not posit any reference to the time saving factor
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 16 Mar 2016, 18:43
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okdongdong wrote:
Official Guide for GMAT Verbal Review, 2nd Edition

Practice Question
Question No.: 51
Page: 137
Difficulty:


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.


the main point - machine will be able to distinguish between weeds and crops.

A - tells about shades of color between different species of WEEDS. not really helping. if the weeds had different colors than the crops, then yes, it would have been the right answer.
B - not helping but rather weakening the claim. it might be the case that the machine will cut the crops.
C - what are the criterion to distinguish between crops and weeds is out of scope.
D - yes...if this can be done, then we can give a specific color to the crops..and the remaining colors would be cut by the machine..so less weeds..looks good.
E - what laborers do - is out of scope.
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 27 Jun 2016, 19:55
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a constant pattern in colour change, on that ground it will distingush weed from crop plants. - this is only thing that is supporting it.

A. There is a considerable degree of variation in shade of color between weeds of different species. weaken it.
B. The shade of color of some plants tends to change appreciably over the course of their growing season. not supportive for sure.
C. When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds. - weaken it.
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. - machine is actually based on this fact only.
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. - weaken it.
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Re: A company plans to develop a prototype weeding machine that   [#permalink] 27 Jun 2016, 19:55

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