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# OG 11 Diagnostic Test- Verbal Question 25

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Intern
Joined: 21 May 2008
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OG 11 Diagnostic Test- Verbal Question 25 [#permalink]

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07 Dec 2008, 12:58
Hi All,
I have serious doubt regarding the reasoning provided to support the answer of Question 25 in Diagnostic Verbal Test.

The question:
Tiger beetles are such fast runners that they can capture virtually any nonflying insect. However, when running toward an insect, a tiger bettle will intermittently stop and then, a moment later, resume its attack. Perhaps the beetles cannot maintain their pace and must pause for a moment's rest; but an alternative hypothesis is that while running, tiger bettles are unable to adequately process the resulting rapidly changing visual information and so quickly go blind and stop.

Which of the following, if discovered in experiments using artificially moved prey insects, would support one of the two hypotheses and undermine the other?

Options:
A) When a prey insect is moved directly toward a bettle that has been chasing it, the bettle immediately stops and runs away without its usuall intermittent stopping.
B) In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses.
C) In pursuing a moving insect, a bettle usually responds immediately to changes in the insect's direction, and it pauses equally frequently whether the chase is up or down an incline.
D) If, when a bettle pauses, it has not gained on the insect it is pursuing, the bettle generally ends its pursuit.
E) The fasta bettle pursues an insect fleeing directly away from it, the more frequently the bettle stops.

Answer I selected was (A), because it shows that it could make anything from the sudden visual changes (the prey running towards it) but it could keep up its pace ( without its usual intermittent stopping)

Kindly help

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Manager
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Re: OG 11 Diagnostic Test- Verbal Question 25 [#permalink]

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07 Dec 2008, 14:43
My answer is B and here's why:

The two hypotheses:
1) Beetles pauses because they get tired
2) Beetles go blind in motion.

We need to find which of the following supports one of the two AND undermines the other.

A) When a prey insect is moved directly toward a bettle that has been chasing it, the bettle immediately stops and runs away without its usuall intermittent stopping. ....> Bettle is not blind, not pausing coz of tiredness. => supports neither hypotheses
B) In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses......>Bettle is not blind, is tired => supports 1, undermines 2
C) In pursuing a moving insect, a bettle usually responds immediately to changes in the insect's direction, and it pauses equally frequently whether the chase is up or down an incline......>not blind, pauses not caused by tiredness => supports neither
D) If, when a bettle pauses, it has not gained on the insect it is pursuing, the bettle generally ends its pursuit. => could be blind, but no conclusion about pausing coz of tiredness. => supports 2, does not undermine 1
E) The fasta bettle pursues an insect fleeing directly away from it, the more frequently the bettle stops. => supports 1, does not undermine 2

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Re: OG 11 Diagnostic Test- Verbal Question 25 [#permalink]

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07 Dec 2008, 14:54
Hi,
In the explanation of Option (A) you have said, that its not blind.

How can it not be blind?
It stopped either because it got blind or because it got tired.
It cannot get tired because the prey suddenly came towards beetle and the 2nd stmt tells tht it ran away from it without pauses.
So logically it means that it stopped because it got blind.

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Re: OG 11 Diagnostic Test- Verbal Question 25 [#permalink]

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07 Dec 2008, 14:57
Interestingly OG gives another explanation to selecting Option B as answer.

Hypotheses
1) Cannot maintain the rapid pace and must rest.
2) Temporarily go blind.

B. Correct. This statement provides information that strengthens the second hypothesis: the swerving pursuit and the resulting continual course adjustments appear to be forcing the beetle to stop with increasing frequency to sort out the erratic visual information.

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Re: OG 11 Diagnostic Test- Verbal Question 25 [#permalink]

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07 Dec 2008, 15:53
jeril842002 wrote:
Hi,
In the explanation of Option (A) you have said, that its not blind.

How can it not be blind?
It stopped either because it got blind or because it got tired.
It cannot get tired because the prey suddenly came towards beetle and the 2nd stmt tells tht it ran away from it without pauses.
So logically it means that it stopped because it got blind.

the beetle stopped because it saw the prey suddenly approaching it while it(the beetle) was in motion.
hence was not blinded

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Re: OG 11 Diagnostic Test- Verbal Question 25   [#permalink] 07 Dec 2008, 15:53
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