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# Scientists have discovered a new species of butterfly that

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Joined: 14 Jun 2011
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Scientists have discovered a new species of butterfly that [#permalink]

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16 Apr 2012, 09:34
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Scientists have discovered a new species of butterfly that lives only in a small region of Central America and is
active only at night. During the day, it rests in treetops, where its green color matches the foliage perfectly.
Therefore, the scientists must have discovered the butterfly at night.

The argument depends on which of the following assumptions?

• The newly discovered butterfly is not related to any other species of butterfly.
• There is no way for the scientists to detect the butterfly during the day.
• No other butterfly species lives in this region of Central America.
• The foliage in the butterfly’s habitat is completely green.
• The butterfly cannot survive in areas outside of Central America.
[Reveal] Spoiler: OA

Last edited by mandald on 16 Apr 2012, 23:18, edited 1 time in total.
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16 Apr 2012, 10:02
I'd say B.

The assumption acts as a logical bridge between the premise and the conclusion. The conclusion is about the scientists not being able to detect them. So the correct answer must include some information about scientists in order to be true.

A) unnecessary information
B) If the butterfly hides during the day and the scientists are only able to find them at night, they must be unable to find them during the day
C) not important
D) not important
E) probably the reason why it only lives in that area, but not important for conclusion to be true.
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16 Apr 2012, 10:31
BN1989 wrote:
I'd say B.

The assumption acts as a logical bridge between the premise and the conclusion. The conclusion is about the scientists not being able to detect them. So the correct answer must include some information about scientists in order to be true.

A) unnecessary information
B) If the butterfly hides during the day and the scientists are only able to find them at night, they must be unable to find them during the day
C) not important
D) not important
E) probably the reason why it only lives in that area, but not important for conclusion to be true.

Hi,

Could you please xplain why D is "Not Important"..
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16 Apr 2012, 10:59
mandald wrote:
BN1989 wrote:
I'd say B.

The assumption acts as a logical bridge between the premise and the conclusion. The conclusion is about the scientists not being able to detect them. So the correct answer must include some information about scientists in order to be true.

A) unnecessary information
B) If the butterfly hides during the day and the scientists are only able to find them at night, they must be unable to find them during the day
C) not important
D) not important
E) probably the reason why it only lives in that area, but not important for conclusion to be true.

Hi,

Could you please xplain why D is "Not Important"..

Even if it might not be completely green, it would still match the foliage perfectly, so that the scientists would still be unable to find them there.
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22 May 2012, 06:28
Confused with B and D :
Try negating the assumption....
• There is no way for the scientists to detect the butterfly during the day.
There is some way for scientists to detect butterfly during the day . Therefore the scientists must have discovered the butterfly at night...

By negating the assumption the conclusion becomes untrue . Therefore B is correct...
• The foliage in the butterfly’s habitat is completely green.
Try negating the above sentence :
The foliage in the butterfly's habitat is not completely green.Therefore the scientists must have discovered the butterfly at night.......

The conclusion can still be true .... So D is incorrect...
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22 May 2012, 07:38
mandald wrote:
Could you please xplain why D is "Not Important"..

During the day, it rests in treetops, where its green color matches the foliage perfectly.

D The foliage in the butterfly’s habitat is completely green.

I found answer D to be irrelevant because it is already stated that the butterfly matches the foliage perfectly. It doesn't matter what color the foliage is. It could be hot pink and it is established that it matches perfectly.
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22 May 2012, 09:05
+1 B

D is wrong because of the word "completly". What about if only a leaf is brown, the butterfly could be invisible even at that scenario.

Apply the negation technique and remember that each word can make a difference.
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23 May 2012, 00:39
• The newly discovered butterfly is not related to any other species of butterfly. - Irrelevant information - Incorrect
• There is no way for the scientists to detect the butterfly during the day. - Only when there is no way of detecting the butterfly during the day, it can be detected at night. - Correct
• No other butterfly species lives in this region of Central America. - We are not talking about any other butterfly species - Incorrect
• The foliage in the butterfly’s habitat is completely green. - Already stated in the arguement - Incorrect• The butterfly cannot survive in areas outside of Central America. - Irrelevant - Incorrect
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25 Jun 2012, 02:34

In forming its conclusion, the argument is making the bold assumption that the scientists do not have any way of catching the butterflies in the day time. If the scientists did, then clearly the argument that the butterflies were definitely caught at night is smash to a thousand and one pieces.

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Der alte Fritz.
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25 Jun 2012, 16:47
B

Conclusion: the scientists must have discovered the butterfly at night

Premise: active only at night
Premise: During the day, its green color matches the foliage perfectly

• The newly discovered butterfly is not related to any other species of butterfly.
--> Out of scope we are not discussing about any other species

• There is no way for the scientists to detect the butterfly during the day.
--> Additional premise that will strengthen the conclusion [keep it]

• No other butterfly species lives in this region of Central America.
--> out of scope as same as A

• The foliage in the butterfly’s habitat is completely green.
--> Already a premise cannot use it "its green color matches the foliage perfectly"

• The butterfly cannot survive in areas outside of Central America.
--> out of scope
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Re: Scientists have discovered a new species of butterfly that [#permalink]

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15 Aug 2014, 06:00
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Scientists have discovered a new species of butterfly that [#permalink]

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15 Aug 2014, 13:55
Hi,

IMO B.

there are two types of assumptions:
supporter and defender

the answer choice will have tend to one these types.

here the answer choices are based on defender assumption i.e. it rules out any other possibilitiues for it to happen .

i guess it helps.

-H
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Re: Scientists have discovered a new species of butterfly that [#permalink]

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25 Jun 2016, 23:17
I will use the @empowergmat technique.
the argument says- Butterfly, green camouflague ->Disc only at night
What i want to know- Any way to disc in day.

• The newly discovered butterfly is not related to any other species of butterfly. Are we discussing the relation? NO remove
• There is no way for the scientists to detect the butterfly during the day.
• No other butterfly species lives in this region of Central America. Are we discussing where they live? No Remove
• The foliage in the butterfly’s habitat is completely green.
• The butterfly cannot survive in areas outside of Central America. Are we discussing where they can survive.

I had to think deep to remove d.
D says about foliage, it does not tell anything about when they can be discovered. In day or night. Therefore we do not know. @empowergmat is D is the best incorrect answer.

So we have B as the answer.

My document says 700. But i guess with time this has become a Sub 600 question
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Re: Scientists have discovered a new species of butterfly that [#permalink]

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28 Jun 2016, 00:05
lee2390 wrote:
I will use the @empowergmat technique.
the argument says- Butterfly, green camouflague ->Disc only at night
What i want to know- Any way to disc in day.

• The newly discovered butterfly is not related to any other species of butterfly. Are we discussing the relation? NO remove
• There is no way for the scientists to detect the butterfly during the day.
• No other butterfly species lives in this region of Central America. Are we discussing where they live? No Remove
• The foliage in the butterfly’s habitat is completely green.
• The butterfly cannot survive in areas outside of Central America. Are we discussing where they can survive.

I had to think deep to remove d.
D says about foliage, it does not tell anything about when they can be discovered. In day or night. Therefore we do not know. @empowergmat is D is the best incorrect answer.

So we have B as the answer.

My document says 700. But i guess with time this has become a Sub 600 question

We do not know how green the foliage is. It could be as green as the butterfly (thus making the butterfly undetectable) or it could also be more green or less green than the butterfly (thus making the butterfly detectable). Now it is already given explicitly in the stem that the tree on which the butterfly sits perfectly matches the butterfly - so this cannot be the assumption. More importantly, the fact that the butterfly's foliage matches the tree is more tangible to us than the butterfly being green (because as mentioned earlier we don't know if the butterfly can be camouflaged based on the previously mentioned logic).
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Re: Scientists have discovered a new species of butterfly that [#permalink]

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31 Jan 2017, 03:56
mandald wrote:
Scientists have discovered a new species of butterfly that lives only in a small region of Central America and is
active only at night. During the day, it rests in treetops, where its green color matches the foliage perfectly.
Therefore, the scientists must have discovered the butterfly at night.

The argument depends on which of the following assumptions?

• The newly discovered butterfly is not related to any other species of butterfly.
• There is no way for the scientists to detect the butterfly during the day.
• No other butterfly species lives in this region of Central America.
• The foliage in the butterfly’s habitat is completely green.
• The butterfly cannot survive in areas outside of Central America.

The conclusion of the argument is that "the scientists must have discovered the butterfly at night." Why? Because the butterfly's color matches the green of the foliage, and the butterfly is active only at night. In order for this argument to work, one has to assume that there is no way for the scientists to detect the butterfly during the day, despite its camouflage. If there is
a way for the scientists to detect the butterfly during the day, the conclusion is no longer logical.

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Re: Scientists have discovered a new species of butterfly that [#permalink]

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12 Apr 2017, 20:33
Conclusion :- "Scientists must have discovered the butterfly at night".
Negating answer choice B :- "There is a way for the scientists to detect the butterfly during the day."{Now, if there is a way for the scientist to
discover a butterfly during day time then they must not have discovered the butterfly at night destroying the conclusion"}.
Hence choice B is correct.
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Re: Scientists have discovered a new species of butterfly that   [#permalink] 12 Apr 2017, 20:33
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