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A company plans to develop a prototype weeding machine that

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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.

Originally posted by okdongdong on 26 Jun 2005, 06:31.
Last edited by Bunuel on 20 Jun 2018, 02:51, edited 7 times in total.
Necessary Corrections for Official Guide Verbal Review 2nd Edition Project
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Re: CR- Verbal Review 2nd ed question 51  [#permalink]

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New post 19 Nov 2013, 19:48
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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.

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New post 19 Jul 2010, 22:55
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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.

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

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New post 30 Jun 2005, 08:09
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I believe D should be the answer, and here is why

The argument states that the machine will be able to distinguish plants from weeds solely on the differences in the shade of color. D states that plants can be bred to have a distinct shade of color. This means that a plant can be bred with a distinct shade of color that is completely different from that of the weeds. Thus, this development will favor the development of this machine.
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New post 01 Jul 2005, 23:01
i go with D

A. is weakining company proposed implementation. Diferencies in color of diferent species will not allow this equipment to work correctly.
b. is the same as above
c. is weakining because it is showing us that there is other common technic to distinguish weeds from crop.
d is out of scope
e. is giving some justification to implement this equipment

what is OA?
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New post 09 Jul 2005, 15:52
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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.

Tells us nothing about the color of the plants (as we are told, the new technology uses differing colors between crops and weeds). The trap - Eliminate

B. The shade of color of some plants tends to change appreciably over the course of their growing season.

Makes the technology non-efficient. Eliminate

C. When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds.

So what? WE are concerned with the new technology, which uses color to distinguish weeds from crops. WE dont care about manual distinction - Eliminate.

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.

Straight Answer. Crops can be bred to have distinct colors, which can enable the technology separate crops from weeds.

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.

We are not concerned about manual processes - Eliminate (irrelevant)


It's a straight (D).
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New post 01 Nov 2006, 22:36
I would go for D too.

A. Weeds come in different shades does not in any way support the ability to differentiate b/w crop and weed.
B. Doesn't necessarily support it
C. Goes against the statement
D. Genetic modification of crops to have the same shade leads to standardization that will enable differentiating b/w crops and weeds
E. 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 01 Nov 2006, 22:46
D

A. There is a considerable degree of variation in shade of color between weeds of different species.
- irrelevant. We are concerned with the difference between shades of crops and weeds, not just between the weeds.

B. The shade of color of some plants tends to change appreciably over the course of their growing season.
- weakens.

C. When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds.
- irrelevant.

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. Provides a perfect explanation as to how the new technology could be really useful.

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.
- irrelevant.
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New post 24 Aug 2009, 13:48
I like D

With this question type we don't look to strengthen or weaken an argument but find a suitable match for one of the facts. The fact here is that the machine will pick weed over crop based on plant shade.

A - This could be a problem as programming the shades of all the weeds could also be the shade of a crop
B - See A - problem
C - Problem as it indicates weed vs crop is a size issue not a colour issue
E - Not really important to the overall fact pattern.

D - Compliments crop can be a different colour than the weeds around!
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Re: A company plans to develop a prototype weeding machine that  [#permalink]

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New post 24 Aug 2009, 17:54
D, as the other choices weakens it...

A. There is a considerable degree of variation in shade of color between weeds of different species. -variation in color of weeds weakens...
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. -not related
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. -best.
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. -not related
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New post 24 Jul 2010, 15:12
D for me.

Genetic manipulation allows the plants to have a different color without altering the characterisitics of the plants. This what the company wants so that the weeding machine can distinguish the weeds from the plants based on its color.
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New post 24 Jul 2010, 23:26
A is weakening. considerable degree of variation in shade of color between species means that weeding machine probably couldn't apply to all kinds of crops.
must be D
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New post 23 Mar 2012, 16:30
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I have chosen D for this question:

It sounds like nobody posted the OA - it is D. This question is #51 in Verbal 2nd Edition.

This passage states that an inventor created a machine that would replace manual weeding, thereby reducing the labor costs.

A. This would actually weaken the argument. The reason is because if there is a large degree of variation in shade of color between weeds, it would be very tough for the machine to differentiate.

B. Again, this weakens the argument. If the color of some plants change over the course of the season, this would make it difficult for the machine to differentiate between a plant and a weed.

C. This describes something that the machine would not be able to do. Therefore, it weakens the argument.

D. This would support the argument. The reason is because manipulation of plants to a certain shade of color would allow the machine to be much more efficient. For example, if we manipulated the plants to be only dark green, then it becomes much easier for the machine to differentiate between plants and weeds.

E. This statement is irrelevant. Also, it suggests that labor costs would not be reduced because there are other agricultural duties that require attending.
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New post 24 Jul 2013, 11:17
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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.
(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 wanted to ask about the role of choice E.
" farm ppl who are responsible for manual weeding work on other agricultural activities during the season when extensive weeding is not required.This could mean 2 things:
a) they have other activities that they can perform during the weeding season . Instead of manually weeding out the weeds, they can perform these other activities. So, the cost of hiring the others for these activities can be saved.

b ) these activities that farm labourers responsible for weeding perform during the season when weeding is not required can only be performed during that particular season. If so, the farm labourers can be relieved during the actual weeding season,thus saving on the costs.

explanation in OG vr2 says : This does not favor the company’s implementing the plan to develop the machine. There would
still be tasks other than weeding that would require hiring staff . Thus there would still be labor
costs even if the need for manual weeding were eliminated"
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New post 24 Jul 2013, 15:02
12bhang wrote:
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 wanted to ask about the role of choice E.
" farm ppl who are responsible for manual weeding work on other agricultural activities during the season when extensive weeding is not required.This could mean 2 things:
a) they have other activities that they can perform during the weeding season . Instead of manually weeding out the weeds, they can perform these other activities. So, the cost of hiring the others for these activities can be saved.

b ) these activities that farm labourers responsible for weeding perform during the season when weeding is not required can only be performed during that particular season. If so, the farm labourers can be relieved during the actual weeding season,thus saving on the costs.

explanation in OG vr2 says : This does not favor the company’s implementing the plan to develop the machine. There would
still be tasks other than weeding that would require hiring staff . Thus there would still be labor
costs even if the need for manual weeding were eliminated"


Personally I would read E as:
(E) when extensive weeding is not necessary farm laborers carry out other agricultural duties at times in the growing season .
When they have some "free-time"(not consumed by extensive weeding ) they do other activities.

Read the conclusion once more:
The inventor of the machine claims that it will reduce labor costs by virtually eliminating the need for manual weeding.

So even if the machine works properly, there are still some activities that requires manual labor, so
"Thus there would still be labor costs even if the need for manual weeding were eliminated"

Your options:
a) they have other activities that they can perform during the weeding season . Instead of manually weeding out the weeds, they can perform these other activities. So, the cost of hiring the others for these activities can be saved.
So the machine will reduce labor costs? No. Even if the machine does all the weeding, there are some other activities it cannot do (keep in mind that we do not know if these other activities are minimal so many farmers can be fired, lowering the costs).
What we know for sure is that some activities still requires manual labor, so as the OG says
"Thus there would still be labor costs even if the need for manual weeding were eliminated" and this does not support the claim "will reduce labor costs".

b ) these activities that farm labourers responsible for weeding perform during the season when weeding is not required can only be performed during that particular season. [we can't infer something like this]
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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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CR- Verbal Review 2nd ed question 51  [#permalink]

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New post 19 Nov 2013, 18:25
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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
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Re: CR- Verbal Review 2nd ed question 51  [#permalink]

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New post 02 Dec 2013, 09:24
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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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New post 25 Dec 2013, 00:03
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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.
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Re: CR- Verbal Review 2nd ed question 51  [#permalink]

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New post 25 Dec 2013, 13:25
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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

I think I can help you with this.

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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