Which of the following best completes the passage below? : GMAT Critical Reasoning (CR)
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# Which of the following best completes the passage below?

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

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26 Mar 2005, 07:00
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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 earthâ€™s electromagnetic fields. As a first step in testing this theory, lepidopterists plan to install a low-voltage transmitter inside one grove of â€œbutterfly treesâ€
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Director
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26 Mar 2005, 08:06
I will go with 'B'.
Are these type of questions representative of what we should expect in GMAT
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26 Mar 2005, 08:11
I'll take B. All the experiment proves is the butterflies are sensitive to electricity. No other conclusion can be made from the experiment.
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butterfiles ( in my brains) [#permalink]

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26 Mar 2005, 09:22
a transmitter radiates em waves if my knowledge is correct, so if it shows that they are sensitive to em fields, D or E will be correct.

The 1st part talks about the time taken to travel, on how they "remember" the path . Therefore i think it will be E.

D cant be true cause there is no conclusive proof about that.
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26 Mar 2005, 09:25
whats the OA for the butterflies
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26 Mar 2005, 12:10
but why B. Whats the logic behind it?
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26 Mar 2005, 12:27
I'll go for B since it is the most conservative answer directly answering the experiment of "lepidopterists [who] plan to install a low-voltage transmitter..."
D and E are too aggressive claims and nothing can warrant what those two conclude
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26 Mar 2005, 12:59
OA is B

(I missed reading "a first step" in the question)
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26 Mar 2005, 13:17
if OA is B then i am helpless a transmitter emits waves not electricity in any way and waves are em fields
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26 Mar 2005, 13:21
I guess I don't get this OA....butterflies sensitive to electricity ?? were we giving shocks to the butterflies I thot we were transmitting em waves thro transmitters.
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26 Mar 2005, 13:44
banerjeea_98 wrote:
I guess I don't get this OA....butterflies sensitive to electricity ?? were we giving shocks to the butterflies I thot we were transmitting em waves thro transmitters.

The only link we can make is to the part which mentions the low-voltage transmitter. Hence, the only logical and most conservative flow would be that as a result of that test, butterflies are sensitive to electricity. The original test has NO CORRELATION whatsoever with electromagnetic fields although it is what another test might try to prove.
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26 Mar 2005, 14:01
That's correct...and that is exactly the mistake I made...I never thought the answer can be B...but the key here is "As a first step" ....which means the experiment on butterflies might not be, in any way, related to EM waves
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26 Mar 2005, 22:02
I agree with you vsom and baner. I don't think a transmitter leaks electricity. (How terrible it can be if it does leak. )

However Paul is right for the logic part I have to say.

I won't say this problem is hard, but I'd say it is a bit strange.
26 Mar 2005, 22:02
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