weeding machine

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arorag: Master | Next Rank: 500 Posts; Posts: 343; Joined: Mon Jan 21, 2008 3:28 pm; Thanked: 4 times

by arorag » Sat Jul 12, 2008 8:50 pm

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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Source: Beat The GMAT — Critical Reasoning | Sat Jul 12, 2008 8:50 pm

reachac: Legendary Member; Posts: 572; Joined: Fri Feb 22, 2008 9:25 am; Thanked: 21 times

by reachac » Sat Jul 12, 2008 9:07 pm

IMO D

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raunekk: Legendary Member; Posts: 1159; Joined: Wed Apr 16, 2008 10:35 pm; Thanked: 56 times

by raunekk » Sat Jul 12, 2008 11:26 pm

"Selection and genetic manipulation " can help to bred plants in a "distinctive shade of color" which can thus be helpful to "prototype weeding machine"..

IMO:D

OA??

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agent47: Senior | Next Rank: 100 Posts; Posts: 73; Joined: Sat Apr 19, 2008 11:16 pm

by agent47 » Sun Jul 13, 2008 9:25 pm

IMO D

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gmat620: Senior | Next Rank: 100 Posts; Posts: 95; Joined: Thu Mar 12, 2009 2:39 am; GMAT Score:620

by gmat620 » Sun Mar 15, 2009 10:46 am

OA:D...but why not A, B, or C...they are of consideration for company. aren't they ?

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S0laris: Master | Next Rank: 500 Posts; Posts: 131; Joined: Wed Feb 25, 2009 7:02 am; Location: Azerbaijan/Baku; Thanked: 2 times

by S0laris » Sun Mar 15, 2009 2:35 pm

gmat620 wrote:OA:D...but why not A, B, or C...they are of consideration for company. aren't they ?

question asks to find assumption, without which one machine is inapplicable

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akhpad: Legendary Member; Posts: 809; Joined: Wed Mar 24, 2010 10:10 pmFollowed by: 4 members; Thanked: 50 times

by akhpad » Sun Mar 28, 2010 8:45 pm

A - talk about only weeds
D - talk about only plants

We need to distinguish between weeds and plants.

Can someone explain why D is correct? What is the problem with A.

It would be highly appreciated.

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ssgmatter: Legendary Member; Posts: 549; Joined: Wed Jan 06, 2010 7:00 amFollowed by: 3 members; Thanked: 16 times

by ssgmatter » Wed May 26, 2010 7:14 am

arorag 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 companyï¿½s 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.

Can anyone please explain this one in more details?...

Best-
Amit

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paes: Legendary Member; Posts: 995; Joined: Tue Apr 13, 2010 11:56 pmFollowed by: 1 member; Thanked: 31 times

by paes » Wed May 26, 2010 9:28 pm

akhp77 wrote:A - talk about only weeds
D - talk about only plants

We need to distinguish between weeds and plants.

Can someone explain why D is correct? What is the problem with A.

It would be highly appreciated.

The assumption is that the weed color should be different from crop color, then only the machine will be successful.
D : is saying that we can create plants of distinctive color. So it means we can create crops with different color that that of weed.

A : is saying only about the colors of weeds.

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kevincanspain: GMAT Instructor; Posts: 613; Joined: Thu Mar 22, 2007 6:17 amFollowed by: 64 members; Location: madrid; Thanked: 171 times; GMAT Score:790

by kevincanspain » Wed May 26, 2010 11:22 pm

arorag 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 companyï¿½s 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.

A is actually a cause for concern. If weeds come in different colors, some weeds may be the same color as the desirable plants.
B poses a similar problem for the machine: if weeds change color, the machine may have trouble distinguishing between weeds and plants on the basis of color.
C is irrelevant as long as differences in color allow the machine to reliably tell weeds apart from plants.
D indicates that plants can be made to have a colour that is different from those of weeds, meaning that the machine can rely on its criteria to work properly.
E is irrelevant

Kevin Armstrong
GMAT Instructor
Gmatclasses
Madrid

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akhpad: Legendary Member; Posts: 809; Joined: Wed Mar 24, 2010 10:10 pmFollowed by: 4 members; Thanked: 50 times

by akhpad » Wed May 26, 2010 11:25 pm

akhp77 wrote:A - talk about only weeds
D - talk about only plants

We need to distinguish between weeds and plants.

Can someone explain why D is correct? What is the problem with A.

It would be highly appreciated.

I got it now.
A: There is a considerable degree of variation in shade of color between weeds of different species.
=> Here, we cannot control intensity of color. it might be much high and low. It would be difficult.

D: we can make distinctive amount of variation in color by making changes in genetics without altering any other characteristics. Here, things in our control. We can adjust accordingly.

OA: D
Source: The OG Verbal Review 2nd Edition

OG explanation in below image, if anybody need it.

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paddle_sweep: Master | Next Rank: 500 Posts; Posts: 379; Joined: Wed Apr 07, 2010 12:53 am; Location: Chennai,India; Thanked: 3 times

by paddle_sweep » Fri Jul 09, 2010 11:11 pm

kevincanspain wrote:
arorag 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 companyï¿½s 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.
A is actually a cause for concern. If weeds come in different colors, some weeds may be the same color as the desirable plants.
B poses a similar problem for the machine: if weeds change color, the machine may have trouble distinguishing between weeds and plants on the basis of color.
C is irrelevant as long as differences in color allow the machine to reliably tell weeds apart from plants.
D indicates that plants can be made to have a colour that is different from those of weeds, meaning that the machine can rely on its criteria to work properly.
E is irrelevant

Hi Kevin, Could you please indicate as to why 'E' is irrelevant here?

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paes: Legendary Member; Posts: 995; Joined: Tue Apr 13, 2010 11:56 pmFollowed by: 1 member; Thanked: 31 times

by paes » Sat Jul 10, 2010 8:22 pm

I would also like to know why E irrelevant.

If farmers are busy then it gives us one more reason to use the machine.

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reply2spg: Legendary Member; Posts: 1261; Joined: Sun Sep 14, 2008 3:46 am; Thanked: 27 times; GMAT Score:570

by reply2spg » Tue Jul 13, 2010 8:34 pm

Here we have to personalize the argument. Consider yourself as a company representative. You have launched one product say weeding machine that uses cutting blades with optical sensors and microprocessors that distinguish weeds from crop plants by differences in shade of color. There is no way to differentiate, other than color, between weed and actual plant. To be successful in the market I will pray that there should be some method which changes the color of other plants, other than weed. If I find out some mechanical method which changes only color of the plant and not any other characteristic, then that method will be helpful for my business. Same has mentioned in option D. Therefore, option D is correct.

arorag 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 companyï¿½s 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.

Sudhanshu
(have lot of things to learn from all of you)

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ankurmit: Legendary Member; Posts: 516; Joined: Mon Nov 02, 2009 6:42 amFollowed by: 1 member; Location: Mumbai; Thanked: 14 times; GMAT Score:710

by ankurmit » Wed Jul 21, 2010 1:20 am

A is actually a cause for concern. If weeds come in different colors, some weeds may be the same color as the desirable plants.
B poses a similar problem for the machine: if weeds change color, the machine may have trouble distinguishing between weeds and plants on the basis of color.
C is irrelevant as long as differences in color allow the machine to reliably tell weeds apart from plants.
D indicates that plants can be made to have a colour that is different from those of weeds, meaning that the machine can rely on its criteria to work properly.

nice explanation ..But can you expain me the what is meaning of this line and what does author intent to ask?

Which of the following is a consideration in favor of the companyï¿½s implementing its plan to develop the prototype?

--------
Ankur mittal

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