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Scientists have discovered a new species of butterfly that

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Scientists have discovered a new species of butterfly that [#permalink] New post 16 Apr 2012, 08:34
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

80% (01:46) correct 19% (00:52) wrong based on 94 sessions
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, 22:18, edited 1 time in total.
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Re: Assumtion Question [#permalink] New post 16 Apr 2012, 09:02
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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Re: Assumtion Question [#permalink] New post 16 Apr 2012, 09:31
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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Re: Assumtion Question [#permalink] New post 16 Apr 2012, 09:59
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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Re: Assumtion Question [#permalink] New post 22 May 2012, 05:28
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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Re: Assumtion Question [#permalink] New post 22 May 2012, 06:38
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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Re: Assumtion Question [#permalink] New post 22 May 2012, 08:05
+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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Re: Assumtion Question [#permalink] New post 22 May 2012, 23:39
• 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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Re: Assumtion Question [#permalink] New post 25 Jun 2012, 01:34
Answer is B.

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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Re: Assumtion Question [#permalink] New post 25 Jun 2012, 15:47
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
Re: Assumtion Question   [#permalink] 25 Jun 2012, 15:47
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