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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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03 Dec 2004, 05:28
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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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03 Dec 2004, 05:34
Looks like "D" to me.

The basic idea to install a low-voltage transmitter inside one grove of â€œbutterfly treesâ€
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03 Dec 2004, 05:35
I think it is 'D'.

The experiment that the lepidopterists are attempting is to test the theory that monrachs guide themselves thru earth's electromagnetic fields. So probably putting a low voltage transmittor will slightly disorient the earth's electromagnetic field, (trying to justfy my answer with an obscure physics funda ) and may mislead the monarchs, so they cud either by attracted or distracted towards the particular tree.
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03 Dec 2004, 07:31
I will go with B too.

Quote:
As a first step in testing this theory

I am guessing the first step is to prove that they are affected by electricity, subsequent steps will show if the earth's electromagnetic field is the cause.
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03 Dec 2004, 08:30
I would go with â€˜Dâ€™.
I assume that the low-voltage trasmitter trasmits electricity and since a magnetic field gets created when electricity flows, I presume it will be similar to the earthâ€™s electromagnetic field.
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03 Dec 2004, 09:41
B for me. This evidence is still not sufficient to prove D. All it does to prove that the butterfly shows certain reactions to electricity.
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03 Dec 2004, 23:04
OA is B.
However I had chosen C. Can someone explain what is wrong with C?
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09 Feb 2006, 23:49
I just came across this question myself and I too have the same question... why is C wrong? I understand why B is right, but to me it is saying the same as C.
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Re: CR - Monarch butterflies [#permalink]

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10 Feb 2006, 15:24
B is right , because it says the first step...
D is a Trap

[quote="sonaketu"]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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12 Feb 2006, 02:26
A just gave me the deepest belly laugh! D goes way too far.

Select (B) and click confirm.
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03 Mar 2006, 15:24
How does testing whether "monarch butterflies are sensitive to electricity" relate to the scientists' hypothesis?

03 Mar 2006, 15:24
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