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# Which of the following best completes the passage below?

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Which of the following best completes the passage below? [#permalink]

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04 Apr 2012, 00:00
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Which of the following best completes the passage below?
Monarch butterflies, whose average life span is nine months, migrate from the midwestern United States to selected forests outside Mexico City. It takes at least three generations of monarchs to make the journey, so the great-great-grandchildren who finally arrive in the Mexican forests have never been there before. Yet they return to the same trees their forebears left. Scientists theorize that monarchs, like homing pigeons, map their routes according to the earth’s electromagnetic fields. As a first step in testing this theory, lepidopterists plan to install a low-voltage transmitter inside one grove of “butterfly trees” in the Mexican forests. If the butterflies are either especially attracted to the grove with the transmitter or especially repelled by it, lepidopterists will have evidence that______
(A) monarch butterflies have brains, however minuscule
(B) monarch butterflies are sensitive to electricity
(C) low-voltage electricity can affect butterflies, whether positively or adversely ===
(D) monarchs map their routes according to the earth’s electromagnetic fields
(E) monarchs communicate in intergenerationally via electromagnetic fields
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Re: CR....Monarch butterflies, whose average life span is nine [#permalink]

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04 Apr 2012, 00:00
How to choose between B and C ...??
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Re: CR....Monarch butterflies, whose average life span is nine [#permalink]

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04 Apr 2012, 02:14
shikhar wrote:
Which of the following best completes the passage below?
Monarch butterflies, whose average life span is nine months, migrate from the midwestern United States to selected forests outside Mexico City. It takes at least three generations of monarchs to make the journey, so the great-great-grandchildren who finally arrive in the Mexican forests have never been there before. Yet they return to the same trees their forebears left. Scientists theorize that monarchs, like homing pigeons, map their routes according to the earth’s electromagnetic fields. As a first step in testing this theory, lepidopterists plan to install a low-voltage transmitter inside one grove of “butterfly trees” in the Mexican forests. If the butterflies are either especially attracted to the grove with the transmitter or especially repelled by it, lepidopterists will have evidence that______
(A) monarch butterflies have brains, however minuscule
(B) monarch butterflies are sensitive to electricity
(C) low-voltage electricity can affect butterflies, whether positively or adversely ===
(D) monarchs map their routes according to the earth’s electromagnetic fields
(E) monarchs communicate in intergenerationally via electromagnetic fields

B should be correct.
the experiment is performed to test if butterflies are sensitive or not, whether the low voltage affects positively or negatively is irrelevant to scientists.

Main purpose is just to know if they are affected by the elctricity

B summarizes this correctly.
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Re: CR....Monarch butterflies, whose average life span is nine [#permalink]

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04 Apr 2012, 02:29
yeah you are right ,
option C says low voltage affects butterflies , whether +ve or -ve is not the concern.
+c option is closer also since the scientists have used low voltage transmitter.
in general electricity might have other results as well depending on the magnitude.
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Re: CR....Monarch butterflies, whose average life span is nine [#permalink]

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04 Apr 2012, 05:04
Quote:
(D) monarchs map their routes according to the earth’s electromagnetic fields

isn't that supposed to be the answer which exactly summarises why the low-voltage transmitter were used in the first place ?
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Re: CR....Monarch butterflies, whose average life span is nine [#permalink]

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04 Apr 2012, 06:02
I agree with slay3r. The issue here is not that you can electricute the great grand son of the butterfly but that the butterfly relies on the magnetic field of the earth for course mapping

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Re: CR....Monarch butterflies, whose average life span is nine [#permalink]

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04 Apr 2012, 07:26
shikhar wrote:
Which of the following best completes the passage below?
Monarch butterflies, whose average life span is nine months, migrate from the midwestern United States to selected forests outside Mexico City. It takes at least three generations of monarchs to make the journey, so the great-great-grandchildren who finally arrive in the Mexican forests have never been there before. Yet they return to the same trees their forebears left. Scientists theorize that monarchs, like homing pigeons, map their routes according to the earth’s electromagnetic fields. As a first step in testing this theory, lepidopterists plan to install a low-voltage transmitter inside one grove of “butterfly trees” in the Mexican forests. If the butterflies are either especially attracted to the grove with the transmitter or especially repelled by it, lepidopterists will have evidence that______
(A) monarch butterflies have brains, however minuscule
(B) monarch butterflies are sensitive to electricity
(C) low-voltage electricity can affect butterflies, whether positively or adversely ===
(D) monarchs map their routes according to the earth’s electromagnetic fields
(E) monarchs communicate in intergenerationally via electromagnetic fields

SHould D not the answer...because the prose says " so the great-great-grandchildren who finally arrive in the Mexican forests have never been there before. Yet they return to the same trees their forebears left. Scientists theorize that monarchs, like homing pigeons, map their routes according to the earth’s electromagnetic fields"
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Re: CR....Monarch butterflies, whose average life span is nine [#permalink]

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04 Apr 2012, 22:55
D cannot be the answer because ,Its too strong a statement ,to make on the basis of a small experiment.
this was just the first step of the experiment which has just proved that these flies show some response to the presence of electromagnetic field , but it does not prove that the flies map their way with the help of electromagnetic field. There could be other factors which dominate this factor.
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Re: CR....Monarch butterflies, whose average life span is nine [#permalink]

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05 Apr 2012, 18:57
C is the answer.
D can not be the answer as the experiment is to test the sesitivity of butterflies to the electro magentic fields. Not how the route is passed down the generations..
I am not sure why B is eliminated. My explanation is that since scientists tested with low voltage transmitter, electricity in the options leads to expanding the experiment to all levels, not only low voltage.
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Re: CR....Monarch butterflies, whose average life span is nine [#permalink]

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04 Jun 2012, 08:37
I got D as answer though. Easily fell into the trap. I just thought based on the premise the "scientist guys" are checking electromagnetic fields and the "evidence" suggests the electromagnetic field.

OA seems to be B. http://www.beatthegmat.com/complete-the ... 20503.html
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Re: CR....Monarch butterflies, whose average life span is nine [#permalink]

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04 Jun 2012, 09:50
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shikhar wrote:
Which of the following best completes the passage below?
Monarch butterflies, whose average life span is nine months, migrate from the midwestern United States to selected forests outside Mexico City. It takes at least three generations of monarchs to make the journey, so the great-great-grandchildren who finally arrive in the Mexican forests have never been there before. Yet they return to the same trees their forebears left. Scientists theorize that monarchs, like homing pigeons, map their routes according to the earth’s electromagnetic fields. As a first step in testing this theory, lepidopterists plan to install a low-voltage transmitter inside one grove of “butterfly trees” in the Mexican forests. If the butterflies are either especially attracted to the grove with the transmitter or especially repelled by it, lepidopterists will have evidence that______
(A) monarch butterflies have brains, however minuscule
(B) monarch butterflies are sensitive to electricity
(C) low-voltage electricity can affect butterflies, whether positively or adversely ===
(D) monarchs map their routes according to the earth’s electromagnetic fields
(E) monarchs communicate in intergenerationally via electromagnetic fields

The wording of the answer choice for (B) is not the best, but it is the best answer choice here. It's really that the butterflies' route is sensitive to electricity, not so much that butterflies physically themselves are sensitive to electricity.

(D) says the butterflies route according to earth's electromagnetic fields. Well, that is the argument originally hypothesized, we are trying to find the assumption.
So as an assumption, we are using a volt transmitter to simulate the electromagnetic fields (an assumption linking the earth's electromagnetic fields and a volt transmitter).

If we are testing with a volt transmitter, this is not evidence that routes are based on the earth's electromagnetic fields. Keyword here is "earth" - the butterflies may be sensitive to some magnetic fields and we may have evidence for that...but making the stretch to the conclusion that we are talking about the "earth's" electromagnetic field is not supported.

(D) simply restates the argument. But because of the example used and the lack of a link between transmitter and earth's electromagnetic fields, we can only say that butterflies (at least their route) are sensitive to electricity (assumed to be linked to these volt transmitters). Thus (B) is the better answer.
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Re: CR....Monarch butterflies, whose average life span is nine [#permalink]

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05 Jun 2012, 01:15
shikhar wrote:
Monarch butterflies, whose average life span is nine months, migrate from the midwestern United States to selected forests outside Mexico City. It takes at least three generations of monarchs to make the journey, so the great-great-grandchildren who finally arrive in the Mexican forests have never been there before. Yet they return to the same trees their forebears left. Scientists theorize that monarchs, like homing pigeons, map their routes according to the earth’s electromagnetic fields. As a first step in testing this theory, lepidopterists plan to install a low-voltage transmitter inside one grove of “butterfly trees” in the Mexican forests. If the butterflies are either especially attracted to the grove with the transmitter or especially repelled by it, lepidopterists will have evidence that______

(B) monarch butterflies are sensitive to electricity
(D) monarchs map their routes according to the earth’s electromagnetic fields

The correct answer should be B. Choice D is too far to reach. The lepidopterists only set up the transmitter into one grove of "butterfly trees", not the Earth' electromagnetic field (EEF). The center word is EEF. There is no bridge between the transmitter and the EEF, so this is the ambiguous assumption if we choose D. Choice B is more correct because we do not need that bridge to reach the conclusion.
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Re: CR....Monarch butterflies, whose average life span is nine [#permalink]

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07 Jun 2012, 01:10
(A) monarch butterflies have brains, however minuscule - Irrelevant information - Incorrect
(B) monarch butterflies are sensitive to electricity - Since they are sensitive to electricity, the butterflies are able to find their way. - Correct
(C) low-voltage electricity can affect butterflies, whether positively or adversely - What kind of affect is uncertain and how does this affect help butterflies find their way - Incorrect
(D) monarchs map their routes according to the earth’s electromagnetic fields - Already mentioned in the premise - Incorrect
(E) monarchs communicate in intergenerationally via electromagnetic fields - This option goes too far to link the communication mechanism in butterflies - Incorrect
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Re: Which of the following best completes the passage below? [#permalink]

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26 Feb 2013, 03:27
shikhar wrote:
Which of the following best completes the passage below?
Monarch butterflies, whose average life span is nine months, migrate from the midwestern United States to selected forests outside Mexico City. It takes at least three generations of monarchs to make the journey, so the great-great-grandchildren who finally arrive in the Mexican forests have never been there before. Yet they return to the same trees their forebears left. Scientists theorize that monarchs, like homing pigeons, map their routes according to the earth’s electromagnetic fields. As a first step in testing this theory, lepidopterists plan to install a low-voltage transmitter inside one grove of “butterfly trees” in the Mexican forests. If the butterflies are either especially attracted to the grove with the transmitter or especially repelled by it, lepidopterists will have evidence that______
(A) monarch butterflies have brains, however minuscule
(B) monarch butterflies are sensitive to electricity
(C) low-voltage electricity can affect butterflies, whether positively or adversely ===
(D) monarchs map their routes according to the earth’s electromagnetic fields
(E) monarchs communicate in intergenerationally via electromagnetic fields

A. Brains not tackled anywhere in the passage
B. this is just right, no jumpy conclusions
C. The issue is sensitivity. If they are repelled we cannot tell just yet that they are adversely affected by it.. It could be just like a smelly cheese they wanted to get away from but has no adverse effects...
D. The passage says this is just the first step to test the theory. Hence, this cannot be concluded just yet.
E. finding routes and not communicating with each other is the issue

Answer: B
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Re: Which of the following best completes the passage below?   [#permalink] 26 Feb 2013, 03:27
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# Which of the following best completes the passage below?

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