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    Strategies and techniques for approaching featured GMAT topics

The advent of chemical fertilizers led the farmers in a certain

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The advent of chemical fertilizers led the farmers in a certain  [#permalink]

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New post 29 Aug 2018, 20:02
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A
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D
E

Difficulty:

  95% (hard)

Question Stats:

42% (01:44) correct 58% (02:01) wrong based on 265 sessions

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The advent of chemical fertilizers led the fanners in a certain region to abandon the practice of periodically growing a ""green-manure"" crop, such as alfalfa, in a field to rejuvenate its soil. As a result, the soil structure in a typical farm field in the region is poor. So to significantly improve the soil structure, fanners will need to abandon the use of chemical fertilizers.

The argument relies on the assumption that

(A) most, if not all, farmers in the region who abandon the use of chemical fertilizers will periodically grow alfalfa

(B) applying chemical fertilizers to green-manure crops, such as alfalfa, has no positive effect on their growth

(C) the most important factor influencing the soil quality of farm field is soil structure

(D) chemical fertilizers themselves have a destructive effect on the soil structure of farm fields

(E) many, if not all, fanners in the region will not grow green-manure crops unless they abandon the use of chemical fertilizers

LSAT 73
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Re: The advent of chemical fertilizers led the farmers in a certain  [#permalink]

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New post 31 Aug 2018, 02:08
Here's my take:

(A) most, if not all, farmers in the region who abandon the use of chemical fertilizers will periodically grow alfalfa
they may grow some other plant instead of alfalfa. eliminate.

(B) applying chemical fertilizers to green-manure crops, such as alfalfa, has no positive effect on their growth
it could have some positive effects, but that doesn't outweigh the cons. eliminate.

(C) the most important factor influencing the soil quality of farm field is soil structure
it could be the second most important factor? too extreme. eliminate.

(D) chemical fertilizers themselves have a destructive effect on the soil structure of farm fields
it could be the case that they don't have a destructive effect. It's just the lack of green planty thingies which is resulting in poor soil structure.

(E) many, if not all, fanners in the region will not grow green-manure crops unless they abandon the use of chemical fertilizers
E better be the answer since we've eliminated the rest.
if fanners can grow green-manure crops without abandoning fertilizers, the argument falls apart. E is a necessary assumption.
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Re: The advent of chemical fertilizers led the farmers in a certain  [#permalink]

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New post 28 Sep 2018, 06:46
The advent of chemical fertilizers led the fanners in a certain region to abandon the practice of periodically growing a ""green-manure"" crop, such as alfalfa, in a field to rejuvenate its soil. As a result, the soil structure in a typical farm field in the region is poor. So to significantly improve the soil structure, fanners will need to abandon the use of chemical fertilizers.

The argument relies on the assumption that

(A) most, if not all, farmers in the region who abandon the use of chemical fertilizers will periodically grow alfalfa

(B) applying chemical fertilizers to green-manure crops, such as alfalfa, has no positive effect on their growth

(C) the most important factor influencing the soil quality of farm field is soil structure

(D) chemical fertilizers themselves have a destructive effect on the soil structure of farm fields

(E) many, if not all, fanners in the region will not grow green-manure crops unless they abandon the use of chemical fertilizers

negating the main point:
farmers need not have to leave CF to improve soil structure
given that a) alfafa can improve soil structure b)CF has degraded the soil strcture

pre-think:
1. what if withouting abandon they still can improve soil structure by doing something x

look at the options:
(A) most, if not all, farmers in the region who abandon the use of chemical fertilizers will periodically grow alfalfa
even if most farmers who abandon CF will not grow alfafa, then soil will further degrade, it is weakinig.

(B) applying chemical fertilizers to green-manure crops, such as alfalfa, has no positive effect on their growth
even if CF has positive effect on growth of crops, it is not relevant at all!.

(C) the most important factor influencing the soil quality of farm field is soil structure
not relevant at all

(D) chemical fertilizers themselves have a destructive effect on the soil structure of farm fields
its what given in the passage.hence cannot be assimption

(E) many, if not all, fanners in the region will not grow green-manure crops unless they abandon the use of chemical fertilizers
if farmers growth both alfafa and use CF, then there is a chance soil structure will improve. hence its a correct answer
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Re: The advent of chemical fertilizers led the farmers in a certain  [#permalink]

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New post 28 Sep 2018, 09:18
When i prethink about this question , i got E as if farmers can do both at the same time.
But as soon as i read option D, i marked option D due to reverse causality.
Option D is already mentioned in the the argument - " As a result, the soil structure in a typical farm field in the region is poor"
So E is correct.
A,B,C are irrelevant. These all options can be true but we need that option which has to be true.
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Re: The advent of chemical fertilizers led the farmers in a certain  [#permalink]

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New post 29 Sep 2018, 02:33
AshutoshB wrote:
The advent of chemical fertilizers led the fanners in a certain region to abandon the practice of periodically growing a ""green-manure"" crop, such as alfalfa, in a field to rejuvenate its soil. As a result, the soil structure in a typical farm field in the region is poor. So to significantly improve the soil structure, fanners will need to abandon the use of chemical fertilizers.

The argument relies on the assumption that

(A) most, if not all, farmers in the region who abandon the use of chemical fertilizers will periodically grow alfalfa

(B) applying chemical fertilizers to green-manure crops, such as alfalfa, has no positive effect on their growth

(C) the most important factor influencing the soil quality of farm field is soil structure

(D) chemical fertilizers themselves have a destructive effect on the soil structure of farm fields

(E) many, if not all, fanners in the region will not grow green-manure crops unless they abandon the use of chemical fertilizers

LSAT 73



Use of Chemical fertilizers ------> Abandon Green Manure

Green Manure -----> Rejuvenate Soil

No Green Manure ----> Poor Soil

To improve Soil ----> Plant Green Manure

To improve Soil -----> Abandon Chemical Fertilizers

Hence, To improve Soil -----> Plant Green Manure ----> Abandon Chemical Fertilizers

Using POE,

(A) most, if not all, farmers in the region who abandon the use of chemical fertilizers will periodically grow alfalfa - Close, but doesn't mention Green manure. Only an example of Green Manure, so we can use that as a blanket for all Green Manure. Incorrect.

(B) applying chemical fertilizers to green-manure crops, such as alfalfa, has no positive effect on their growth - Irrelevant

(C) the most important factor influencing the soil quality of farm field is soil structure - Irrelveant

(D) chemical fertilizers themselves have a destructive effect on the soil structure of farm fields - Yes but how will the farmers improve soil structure, hence it leads only half the conclusion.

(E) many, if not all, fanners in the region will not grow green-manure crops unless they abandon the use of chemical fertilizers - Correct.


Answer E.


Thanks,
GyM
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Re: The advent of chemical fertilizers led the farmers in a certain &nbs [#permalink] 29 Sep 2018, 02:33
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