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GMATPREP ChallengeQ - More selective than most chemical pesticides in

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Re: GMATPREP ChallengeQ - More selective than most chemical pesticides in [#permalink]

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New post 07 Nov 2017, 00:29
pikolo2510 wrote:
4. The example presented by the author in highlight text most clearly serves to illustrate
A. a situation in which a species is less vulnerable to biocontrol agents than it would have been to chemical pesticides.
B. a way in which the introduction of a biocontrol agent can affect a nontarget species.
C. a nonnative agent's adapting in an unpredictable way that results in damage to a new host.
D. The contention that biocontrol agents can harm nontarget species by competing with them for resources
E. the way in which indirect consequences from the use of biocontrol agents are most likely to occurs.

In the above question Option B and E are close. Can anyone explain their POE?


I also hesitated those 2 options. Then I eliminated E because of the word "most likely". Any other ideas how to POE?
Thanks
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Re: GMATPREP ChallengeQ - More selective than most chemical pesticides in [#permalink]

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New post 17 Dec 2017, 22:50
1
wadepooja9 wrote:
Why is A wrong in Qs No 5?

Quote:
5. According to the passage, which of the following is a concern that arises with biocontrol agents but not with chemical pesticides?

(A) Biocontrol agents are likely to destroy desirable species as well as undesirable ones.

(B) Biocontrol agents are likely to have indirect as well as direct adverse effects on nontarget species.

(C) Biocontrol agents may change in unforeseen ways and thus be able to damage new hosts.

(D) Biocontrol agents may be ineffective in destroying targeted species.

(E) Biocontrol agents may be effective for only a short period of time.

They ask for a concern that arises with biocontrol agents but NOT with chemical pesticides. Refer to the first sentence of the passage: "More selective than most chemical pesticides in that they ordinarily destroy only unwanted species, biocontrol agents..." So biocontrol agents ordinarily destroy only unwanted species. This implies that chemical pesticides destroy both unwanted species and other wanted species.

Chemical pesticides are likely to destroy desirable species as well as undesirable ones, so choice (A) represents a concern for BOTH chemical pesticides and biocontrol agents. Thus, (A) should be eliminated.
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Re: GMATPREP ChallengeQ - More selective than most chemical pesticides in [#permalink]

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New post 06 Mar 2018, 00:51
Would anyone please explain the answer of question 6 ? ( want to know the POE of D )

I have selected D ( bcz in the passage it has been stated that 'a virus was introduced....')

Though A seemed also correct.
So confused to choose between D and A
Re: GMATPREP ChallengeQ - More selective than most chemical pesticides in   [#permalink] 06 Mar 2018, 00:51

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