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# Certain pesticides can become ineffective if used repeatedly

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Certain pesticides can become ineffective if used repeatedly [#permalink]

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01 Aug 2004, 22:45
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0% (00:00) correct 100% (02:13) wrong based on 2 sessions

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Certain pesticides can become ineffective if used repeatedly in the same place: one reason is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals.
(A) Certain pesticides can become ineffective if used repeatedly in the same place; one reason is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals.
(B) If used repeatedly in the same place, one reason that certain pesticides can become ineffective is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals.
(C) If used repeatedly in the same place, one reason certain pesticides can become ineffective is suggested by the finding that much larger populations of pesticide-degrading microbes are found in soils with a relatively long history of pesticide use than those that are free of such chemicals.
(D) The finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals is suggestive of one reason, if used repeatedly in the same place, certain pesticides can become ineffective.
(E) The finding of much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in those that are free of such chemicals suggests one reason certain pesticides can become ineffective if used repeatedly in the same place.

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02 Aug 2004, 18:51
E is best
B and C have a misplaced modifier problem in opening sentence
D) "suggestive of one reason" is unidiomatic
Between A and E, E is better because of active voice (suggests vs is suggested)
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Paul

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03 Aug 2004, 10:17
The OA is A. I found this in OG. I'm still not happy with their explanation. E sounds good to me also. Anybody cares to explain why E is not good?
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04 Aug 2004, 04:16
Though i marked E, i can think of one reason why E may not be right.

In E -
The finding of much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in those that are free of such chemicals suggests one reason certain pesticides can become ineffective if used repeatedly in the same place.
In the above sentence 'those' may refer to soils or to large populations of pesticide-degrading microbes.

But in A -
Certain pesticides can become ineffective if used repeatedly in the same place; one reason is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals.

The ambiguity is absent in A.

Paul.
Do you think that this may be the reason.
Thanks.
Bhai,
Sorry couldn't post the OA earlier.
Thanks.

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05 Aug 2004, 07:32
1.
anuramm wrote:
In E -
The finding of much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in those that are free of such chemicals suggests one reason certain pesticides can become ineffective if used repeatedly in the same place.
In the above sentence 'those' may refer to soils or to large populations of pesticide-degrading microbes.

The finding of much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in those that are free of such chemicals suggests one reason certain pesticides can become ineffective if used repeatedly in the same place.

Not sure, but I think there is no pronoun confusion in above.
"in" soils... than "in" those...
those should really mean soli here.

2. But in E,
(E) The finding [of much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in those that are free of such chemicals] suggests one reason certain pesticides can become ineffective [if used repeatedly in the same place].

=> The finding suggests one reason (###) certain pesticides can become ineffective.
Isn't something missing here? like a "for"
"The finding suggests one reason for certain pesticides becoming ineffective" sounds better.

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05 Aug 2004, 07:55
anuram, "those" clearly refers to the immediately plural preceding pronoun which is "soils"
hardworker, I think that may be the flaw in E. I think findings suggest a conclusion, not a reason. A may sound better because a reason can be suggested by findings. But again, if this is the error, it is a very subtle one.
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05 Aug 2004, 08:34
Paul, I think that the key thing in this question is what it means

And what it means is that "scientists have found THAT THERE ARE much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals"

If you read E carefully you will see that it implies that scientists have found LARGER POPULATIONS... . They haven't found larger populations, they found THAT THERE ARE larger populations...

The word "find" in this question means "find out" or "establish the fact"
E distorts the picture

Do you agree?

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05 Aug 2004, 08:34
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