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

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 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.

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.

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 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.

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.

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 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.

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

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 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.

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.