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A company plans to develop a prototype weeding machine that

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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.
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.
[Reveal] Spoiler: OA

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

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

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

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New post 23 Mar 2012, 16:30
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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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 23 Mar 2012, 21:10
I choose A,

Why would anyone want to breed weeds? Weeds are hazardous to plants & thus are removed. D just doesnt make sense for the company to launch their product
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 19 Apr 2014, 09:03
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?

What is the reason for the invention?

A. There is a considerable degree of variation in shade of color between weeds of different species. - Irrelevant
B. The shade of color of some plants tends to change appreciably over the course of their growing season. - Change of colors to crop doesnt say the reason
C. When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds. - Its tempting but still they ddint said anything about the toughness of the manual weeding depending on this.
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. - Genetic manipulation of plants by other species(our case weed), Hence the good reason among all to support the necessity of invention.
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
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 30 Jun 2014, 20:18
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?

prototype machine - distinguish weeds from crop plans by difference in color.
This will reduce costs.

We need to find answer choice that supports the claim.
any statement that removes the potential weakener related to color differentiation between weeds and crop is the correct answer choice.



A. There is a considerable degree of variation in shade of color between weeds of different species. - Incorrect. This is a weakener. We are looking statement that supports the claim.
B. The shade of color of some plants tends to change appreciably over the course of their growing season. - Incorrect. This is a weakener. We are looking statement that supports the claim.
C. When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds. - Incorrect. This is again a weaken choice. It removes color as a parameter. so the plan will fail as the prototype depends on color to distinguish weeds from plants.
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. This statement protects the argument against potential weakener. Hence, correct answer choice.
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. - Incorrect. Irrelevant answer choice.
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 26 Jul 2015, 13:06
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 14 Apr 2016, 23:48
Conclusion: Machine will reduce labour costs by eliminating need for manual labour.
Premise: Machines can distinguish weed plants from crops by shades of colour

Assumption: Crops are actually different in their shade of colour from weeds.

Something which validates this assumption will strengthen the argument
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 15 Apr 2016, 23:04
PoojaSimply 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.
Variation of shades is not an issue. prototype is going to handle all these. it's a premise so consider true. this choice is a weaken-er.

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

same as A. this is not a problem. this choice is a weaken-er.

C. When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds.
that may be true. but it does not help to strengthen anything about the conclusion. 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.
if we can have a shade of color with no extra cost and no change in characteristic then it strengthen the fact that prototype will will be successful in its implementation and will reduce the manual work. hence reduce the extra cost.

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 choice weakens the argument. Argument is not focussed on benifits from laborers but from machine.
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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Option 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 argument says that the machine helps reduce labor costs.

First, when extensive weeding is necessary, the usage of m/c might help the case. We aren't sure. The option doesn't talk about any advantage the company might have in implementing a prototype of such a machine.
Second, when there isn't extensive weeding required, the farm laborers are already involved in other activities. In such a case, the machine will not help in reducing costs.

I hope this clears it herbgatherer
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 18 Dec 2016, 22:53
PoojaSimply 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.


Type - Strengthen
Boil it down - prototype weeding machine that distinguishes weeds from crop plants by differences in shade of color will reduce labor costs
Pre-thinking - do the weeds and crops have distinct colors at the first place ? A technique using which this can be achieved

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

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New post 18 Dec 2016, 23:46
nailin16 wrote:
Why is it not A?

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Hi nailin16 ,
A. There is a considerable degree of variation in shade of color between weeds of different species. - This statement is likely to make it difficult for prototype weeding machine to distinguish weed from crop plants . The complexity of underlying technology will increase if it has to have optical sensors that can differentiate between considerable degree of variation in shade of color between weeds of different species and crop plants .
At worst it tells that the prototype weeding machine might be unsuccessful and weakens the argument .

Hope this helps!! :)
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 18 Mar 2017, 08:23
prototype uses optic sensor distinguishing shadows of colours separates weed from crops

we need to find an answer saying this will work:
A: weakens
B: weakens
C: there are other criterias=>out o scope
D: shade of color won't alter=>strenghtens
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 19 Mar 2017, 18:47
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 26 Mar 2017, 17:20
D - you can adjust crops and therefore differentiate
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 19 Jun 2017, 23:44
Although D is the correct ans. I can't seem to find out option E. Has it been deleted by mistake?
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Re: A company plans to develop a prototype weeding machine that [#permalink]

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New post 21 Jun 2017, 07:52
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. Out of scope
Reasoning: Shades of different species of weed is discussed rather than discussing difference in shades if weed and crop.

B. The shade of color of some plants tends to change appreciably over the course of their growing season. Wrong
Reasoning:This option is generalizing it for all the plants instead of discussing weed and crop.

C. When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds. Wrong
Reasoning : Shape and size of the leaves are discussed here and not shades 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
Reasoning : here since we can manipulate the shades of any plant which include weed also we can well distinguish between the crop and weed and the machine work on the principle of shades variation detected it will work and hence the company can produce the prototype

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Re: A company plans to develop a prototype weeding machine that   [#permalink] 21 Jun 2017, 07:52
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