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Dutch elm disease, which is caused by the fungus C. ulmi spread by

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Dutch elm disease, which is caused by the fungus C. ulmi spread by  [#permalink]

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New post Updated on: 24 Feb 2019, 23:33
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Dutch elm disease, which is caused by the fungus C. ulmi spread by adult scolytid beetles, has already destroyed 70 percent of the elms in Greenwood Forest. Another naturally occurring fungus, P. oblonga, kills larvae of the scolytid beetle. Forest rangers plan to introduce P. oblonga into Greenwood Forest in order to save the remaining mature elms.

Which of the following, if true about P. oblonga, provides the strongest evidence that the plan will succeed?

(A) It is spread by a variety of birds that nest in trees that are the home of scolytid beetle larvae.
(B) It has been known to lie dormant within a tree for up to ten years before it begins to reproduce.
(C) It spreads more slowly than C. ulmi, under most climatic conditions.
(D) It does not destroy some commonly found subspecies of scolytid beetles.
(E) It has been known to kill maple trees by destroying their root systems


This question is different from the other question with same prompt. Please read carefully.

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Originally posted by mihir0710 on 25 Jul 2017, 12:03.
Last edited by Bunuel on 24 Feb 2019, 23:33, edited 3 times in total.
Renamed the topic.
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Re: Dutch elm disease, which is caused by the fungus C. ulmi spread by  [#permalink]

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New post 01 May 2018, 04:03
mihir0710 wrote:
This question is different from the other question with same prompt. Please read carefully.

Dutch elm disease, which is caused by the fungus C. ulmi spread by adult scolytid beetles, has already destroyed 70 percent of the elms in Greenwood Forest. Another naturally occurring fungus, P. oblonga, kills larvae of the scolytid beetle. Forest rangers plan to introduce P. oblonga into Greenwood Forest in order to save the remaining mature elms.
Which of the following, if true about P. oblonga, provides the strongest evidence that the plan will succeed?




SB spreads C.U---> killed 70% of elms
What can stop SB? ------> P.OB
Result: Can save the remaining elms

Type: Strenghten
Prethinking: 1. Anything that speeds up the process
2. Killing SB doesn't lead to any other way that would kill elms.
3. Any support that indicates that killing of SB is easy and viable.

Option choices:

(A) It is spread by a variety of birds that nest in trees that are the home of scolytid beetle larvae. ---> Prethinking 1 in action
(B) It has been known to lie dormant within a tree for up to ten years before it begins to reproduce. Out of scope
(C) It spreads more slowly than C. ulmi, under most climatic conditions. Opposite of prethinking1-->weakens
(D) It does not destroy some commonly found subspecies of scolytid beetles. -->Weakens
(E) It has been known to kill maple trees by destroying their root systems ---> Can it be any more out of scope?
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Re: Dutch elm disease, which is caused by the fungus C. ulmi spread by  [#permalink]

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New post 01 May 2018, 09:13
mihir0710 wrote:
This question is different from the other question with same prompt. Please read carefully.

Dutch elm disease, which is caused by the fungus C. ulmi spread by adult scolytid beetles, has already destroyed 70 percent of the elms in Greenwood Forest. Another naturally occurring fungus, P. oblonga, kills larvae of the scolytid beetle. Forest rangers plan to introduce P. oblonga into Greenwood Forest in order to save the remaining mature elms.
Which of the following, if true about P. oblonga, provides the strongest evidence that the plan will succeed?

(A) It is spread by a variety of birds that nest in trees that are the home of scolytid beetle larvae.
(B) It has been known to lie dormant within a tree for up to ten years before it begins to reproduce.
(C) It spreads more slowly than C. ulmi, under most climatic conditions.
(D) It does not destroy some commonly found subspecies of scolytid beetles.
(E) It has been known to kill maple trees by destroying their root systems


Option A. This question is like selecting the lesser evil among the options. Argument says that P. oblonga kills larvae of beetles. Rangers plan to introduce them in Greenwood forest to save elms. We have to provide strongest evidence.
If we look at options, Options B, D, and E are highly irrelevant to the problem at hand. Option C says P. oblonga spreads slow, but this is also irrelevant since Rangers are already going to introduce them in the Forest. So, spreading is not the issue.
Hence, we are left with Option A. Since these are already spread by birds to keep the nests safe, spreading might work. Hence A is the answer
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Re: Dutch elm disease, which is caused by the fungus C. ulmi spread by  [#permalink]

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New post 01 May 2018, 19:53
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bunny12345 I would differ with your reasoning given for selecting Option A. We have to select an answer choice that makes killing of SB easy and also speeds up this process. As per Option A P-Oblonga is spread by variety of birds that nests in trees which is home of SB. Hence this will speeden up the process of killing SB as P-Oblonga shall be able to spread fastly and thus we would be able to save remaining of the elms
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Re: Dutch elm disease, which is caused by the fungus C. ulmi spread by  [#permalink]

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New post 02 May 2018, 09:37
Question Type: Strengthen

Argument: P. oblonga kills larvae of the scolytid beetle. So, forest rangers plan to introduce P. oblonga to save the remaining elms.

(A) It is spread by a variety of birds that nest in trees that are the home of scolytid beetle larvae. - Since P. oblonga is spread by birds, it aids the process to kill the larvae of scolytid beetle.

(B) It has been known to lie dormant within a tree for up to ten years before it begins to reproduce. - Weakens

(C) It spreads more slowly than C. ulmi, under most climatic conditions. - Irrelevant

(D) It does not destroy some commonly found subspecies of scolytid beetles. - Weakens

(E) It has been known to kill maple trees by destroying their root systems - Irrelevant

Answer: A
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Re: Dutch elm disease, which is caused by the fungus C. ulmi spread by  [#permalink]

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New post 02 May 2018, 12:58
Dutch elm disease, which is caused by the fungus C. ulmi spread by adult scolytid beetles, has already destroyed 70 percent of the elms in Greenwood Forest. Another naturally occurring fungus, P. oblonga, kills larvae of the scolytid beetle. Forest rangers plan to introduce P. oblonga into Greenwood Forest in order to save the remaining mature elms.
Which of the following, if true about P. oblonga, provides the strongest evidence that the plan will succeed?

(A) It is spread by a variety of birds that nest in trees that are the home of scolytid beetle larvae. Correct.
(B) It has been known to lie dormant within a tree for up to ten years before it begins to reproduce. Weakens.
(C) It spreads more slowly than C. ulmi, under most climatic conditions. Weakens.
(D) It does not destroy some commonly found subspecies of scolytid beetles. Weakens.
(E) It has been known to kill maple trees by destroying their root systems Out of scope.
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Re: Dutch elm disease, which is caused by the fungus C. ulmi spread by  [#permalink]

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New post 23 Feb 2019, 21:19
I marked the answer as D here.

Can anyone please explain why A is correct and D is wrong?
I'm unable to understand. Kindly elaborate.
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Re: Dutch elm disease, which is caused by the fungus C. ulmi spread by   [#permalink] 23 Feb 2019, 21:19
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