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It is crucially important to farmers that the herbicides they use to

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It is crucially important to farmers that the herbicides they use to  [#permalink]

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New post Updated on: 19 Dec 2018, 05:28
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It is crucially important to farmers that the herbicides they use to control weeds not damage their crops. One very effective herbicide is safe for corn but lethal to soybeans. To maintain the nutrients in the soil, soybeans and corn are frequently sown in a field in alternate years. Therefore, in such fields, the herbicide can safely be used on the corn, since the two crops are not sown together in the same field.

Which of the following, if true, most seriously weakens the argument?


(a) The herbicide has not been shown to harm insects, birds, or other animals that come in contact with it.

(b) Scientists have so far failed in their attempts to breed soybeans that are resistant to the herbicide.

(c) Some of the herbicide persists as a residue in the soil for over a year.

(d) To be effective, the herbicide must be applied early in the growing season of the corn.

(e) Soybean crops do not require the application of herbicides to the same extent as do corn crops.

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Originally posted by LordStark on 09 Aug 2018, 01:24.
Last edited by Bunuel on 19 Dec 2018, 05:28, edited 1 time in total.
Renamed the topic and edited the question.
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Re: It is crucially important to farmers that the herbicides they use to  [#permalink]

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New post 09 Aug 2018, 02:07
PeepalTree wrote:
It is crucially important to farmers that the herbicides they use to control weeds not damage their crops. One very effective herbicide is safe for corn but lethal to soybeans. To maintain the nutrients in the soil, soybeans and corn are frequently sown in a field in alternate years. Therefore, in such fields, the herbicide can safely be used on the corn, since the two crops are not sown together in the same field.

Which of the following, if true, most seriously weakens the argument?

(a) The herbicide has not been shown to harm insects, birds, or other animals that come in contact with it.
(b) Scientists have so far failed in their attempts to breed soybeans that are resistant to the herbicide.
(c) Some of the herbicide persists as a residue in the soil for over a year.
(d) To be effective, the herbicide must be applied early in the growing season of the corn.
(e) Soybean crops do not require the application of herbicides to the same extent as do corn crops.


What can damage soybeans even though soybeans and corn are not sown together? For example, traces of herbicides. Lets have a look

A. Insects, birds and animals are out of scope
B. Soybenas may not be resistant to herbice if soybeans are sown in alternate year
C. Correct. In line with our prethinking
D.Talks about effectivness, not about soybeans
E. Extent of application doesn't matter. Actually strenghthens the argument
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Re: It is crucially important to farmers that the herbicides they use to  [#permalink]

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New post 19 Dec 2018, 05:23
Conclusion: Herbicides are safe for corns while they are lethal for soyabens. Since, Corns and Soyanbeans are not sown in the same field in the same year, Herbicides could be used on Corn.
To weaken this argument we need a statement that could prove that herbicides once used on corn in a field also have some effect on Soyabeans although they are sown in different years.
Answer choice C best accomplishes the work. If herbicides persist in a field for over a year then they would have some effect on Soyabean sown in the same field in the next year. Hence, C is the answer.
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Re: It is crucially important to farmers that the herbicides they use to  [#permalink]

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New post 12 Jan 2019, 22:50
Conclusion: Herbicides are safe for corns while they are lethal for soyabens. Since, Corns and Soyanbeans are not sown in the same field in the same year, Herbicides could be used on Corn.
To weaken this argument we need a statement that could prove that herbicides once used on corn in a field also have some effect on Soyabeans although they are sown in different years.
Answer choice C best accomplishes the work. If herbicides persist in a field for over a year then they would have some effect on Soyabean sown in the same field in the next year. Hence, C is the answer.
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Re: It is crucially important to farmers that the herbicides they use to  [#permalink]

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New post 06 May 2019, 19:29
LordStark wrote:
It is crucially important to farmers that the herbicides they use to control weeds not damage their crops. One very effective herbicide is safe for corn but lethal to soybeans. To maintain the nutrients in the soil, soybeans and corn are frequently sown in a field in alternate years. Therefore, in such fields, the herbicide can safely be used on the corn, since the two crops are not sown together in the same field.

Which of the following, if true, most seriously weakens the argument?


(a) The herbicide has not been shown to harm insects, birds, or other animals that come in contact with it.

(b) Scientists have so far failed in their attempts to breed soybeans that are resistant to the herbicide.

(c) Some of the herbicide persists as a residue in the soil for over a year.

(d) To be effective, the herbicide must be applied early in the growing season of the corn.

(e) Soybean crops do not require the application of herbicides to the same extent as do corn crops.


Premise :- soybeans and corn are frequently sown in a field in alternate years.
Conclusion :- in such fields, the herbicide ( Which is lethal to soybeans ) can safely be used on the corn, since the two crops are not sown together in the same field.

To weaken this conclusion we need to show that " in such fields, the herbicide ( Which is lethal to soybeans ) can NOT safely be used on the corn, since the two crops are not sown together in the same field."

Option C does that job.

If some of the herbicide persists as a residue in the soil for over a year then it may kill soybean in the following year ( after the year when corn was sown). So in such fields, the herbicide ( Which is lethal to soybeans ) can NOT safely be used on the corn.

Please give me kudo s if you liked my explanation.
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Re: It is crucially important to farmers that the herbicides they use to   [#permalink] 06 May 2019, 19:29
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