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Tiger beetles are such fast runners that they can capture virtually an

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Director
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Re: Tiger beetles are such fast runners that they can capture virtually an [#permalink]

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New post 16 Jul 2007, 18:49
I believe it's C.

According to C,

"a beetle usually responds immediately to changes in the insect's direction"
it means beetle doesn't go blind. It undermines the second hypotheses.

"it pauses equally frequently whether the chase is up or down an incline", it means beetle cannot maintain their pace and must pause for a moment's rest. It supports the first hypothese.

In my opinion, B can not be an answer.
B says that "beetle alters its course".
It may happen that beetle might be going blind and changing their directions.

OA please.....Interesting CR!!

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Brajesh
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New post 27 May 2008, 18:31
So which one is your answer ????
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New post 28 May 2008, 09:40
This is C all the way. I even have a screen capture if you want proof.
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New post 28 May 2008, 10:57
Well its really good question. +1 to you. My pick would be C. if correct would provide explan.
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New post 28 May 2008, 14:27
C for me as well.
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New post 28 May 2008, 14:39
B and C r close

Will go for B.
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New post 28 May 2008, 17:15
I am going for B..
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New post 28 May 2008, 17:22
As usual everyone's reasoning it through :P .... in their heads ...
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New post 28 May 2008, 17:25
bsd_lover wrote:
As usual everyone's reasoning it through :P .... in their heads ...



OK..so here is why..one of the choices has to weaken 1 hypothesis..and strengthen the other..

B says..hey if the prey moves very quickly it wont blind the beatle..while at the same time it strengthens the other hypothesis that they just run out of gas :)
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New post 28 May 2008, 21:38
I dont like this OG question, even reading OE many times but still being stuck! I wonder why OG writers can even write it like that! :P :P :P
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New post 29 May 2008, 05:43
are you sure OA is C?

I just searched and saw OA as B??
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New post 29 May 2008, 06:28
BSD can you confirm your OA please?

according to the link below, this question is on OG-11 and the OA is B

p349711#p349711
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New post 29 May 2008, 15:05
I encountered this yesterday on GMATPrep. Its as fresh in my mind as fresh can get. I even double checked it now in gmatprep. The answer is indeed C. If you compare, the answer options are in a different order in the other thread. The C here is B there.
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chan4312 wrote:
lexis wrote:
This question is in GMATPrep. The OA is C.

Hyp1: The Tiger beetles can not maintain their pace (they are tired) so that can not catch the insect
Hyp2: The Tiger beetles are unable to process the resulting rapidly changing visual information ==> Need pause to recover eyes' ability.

C says that after the pause, Tiger beetles gain speed to catch the insect. C is best.



Also with ups and downs, It does stop for a while (tired) which supports Hyp1..but does not stop for every up and every down( visual problem) it encounters, which undermines Hyp2.
because Hyp2 says beetle stops because of changing visual information.


If they are tired they will not "maintain a fixed time interval between pauses", because it is cyclic movement.

After the pause, the beetles increase speed. Ìf they tired, they will not gain speed anymore (after several pauses).
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New post 18 Jul 2008, 11:24
C

Hypothesis 1: Cannot keep pace and pauses to rest
Hypothesis 2: Cannot process info and goes blind

Correct answer will support one of the hypothesis and undermine the other.

I solved this one using a table.

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New post 29 Sep 2008, 17:40
C seems correct!

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


H1: not in control
H2: going blind

A) When a prey insect is moved directly toward a beetle that has been chasing it, the beetle immediately stops and runs away without its usual intermittent stopping. [Undermines H1 and H2]

B) In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses. [Supports H1 and H2]

C) In pursuing a moving insect, a beetle usually responds immediately to changes in the insect’s direction, and it pauses equally frequently whether the chase is up or down an incline. [ Undermine H2 but supports H1]

D) If, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit. [irrelevant]

E) The faster a beetle pursues an insect fleeing directly away from it, the more frequently the beetle stops. [Supports both H1 and H2]
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New post 29 Sep 2008, 19:31
pampas11 wrote:
Please, could you provide how you reached your answer? Particularly, how you undermined the other conclusion? Thank you.

-----------------------------------------------------------------------------------------

Tiger beetles are such fast runners that they can capture virtually any nonflying insect. However, when running toward an insect, a tiger beetle 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 beetles 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?

A) When a prey insect is moved directly toward a beetle that has been chasing it, the beetle immediately stops and runs away without its usual 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 beetle 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 beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit.
E) The faster a beetle pursues an insect fleeing directly away from it, the more frequently the beetle stops.


H1 -> cannot maintain pace, needs rest

H2 -> cannot absorb visual info, overwhelmed, gets blind for a short period and hence stops

C weakens H2 by saying a beetle usually responds immediately to changes in the insect’s direction. so irrespective of how the moving insect changes directions it is able to grasp the visual info.

C supports H1 by saying it pauses equally frequently whether the chase is up or down an incline. taking rest and then getting back to chase

E IMO supports both. insect going fast, beetle cannot maintain pace. takes rest.

insect moving fast and beetle cannot comprehend visual info ,takes a pause.

I would pick C
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New post 29 Sep 2008, 23:50
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IMO C.

Hypothesis1 is: tiger beetles are unable to adequately process the resulting rapidly changing visual information
Hypothesis2 is: so quickly go blind and stop.

Only C states the scenario to support hypothesis1 but hurt hypothesis2. "responds immediately to changes in the insect’s direction" supports the hypothesis1 while ignores the blind issue.

In E whether beetle stops due to blindness or changing variation is not clear. Whereas C clearly states the cause.
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New post 30 Sep 2008, 00:32
Hey this isnt right question. The correct question is as follows:

Tiger beetles are such fast runners that they can capture virtually any nonflying insect. However, when running toward an insect, the beetles intermittently stop, and then, a moment later, resume their attack. Perhaps they cannot maintain their pace and must pause for a moment's rest; but an alternative hypothesis is that while running tiger beetles are unable to 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 ?

A) When a prey insect is moved directly toward a beetle that has been chasing it, the beetle immediately turns and runs away without its usual intermittent stopping.

B) The beetles maintain a fixed time interval between pauses, although when an insect that had been stationary begins to flee, the beetle increases its speed after the next pause.

C) In pursuing a moving insect, the beetles usually respond immediately to changes in the insect's direction, and pause equally frequently whether the chase is up or down an incline.

D) If, when the beetle pauses, it has not gained on the suspect while pursuing, the beetle generally ends the pursuit.

E) When an obstacle is suddenly introduced just in front of the running beetles, the beetles stop immediately, but they never respond by running around the barrier.

OA B

This is original GMAT Prep SC
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New post 02 Sep 2012, 00:49
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This question is very debatable since there are a lot of correct answers hovering around. I initially selected (E) as the correct answer, however on reviewing the answer choices again, I think (C) is the correct answer choice.

Here is my attempt to crack the answer choices.
When we attempt to select the answer that supports one theory and undermine the other, the best way to approach the problem would be to each answer choice and see whether it strengthens one theory or the other.
Similarly repeat the above step, with other choices.
After selecting the choices that support one theory, we would see whether the same choices undermine the other theory or not.

X(A) this is irrelevant to either theory (1) or (2). It neither supports any of the theories. So this choice is eliminated.
(B) This choice undermines theory (2). The beetles process the visual information immediately. We need to keep this choice.
(C) Theory (2) says that RUNNING beetles are unable t process the rapidly visual information, and they quickly go blind and stop. This choice says that when the prey starts to flee, the beetle increases its speed after the next pause. This means that it is able to process rapidly what it needs to do after the next pause. Note that this answer choice is not saying that it's not running while processing the visual info. All it says that it starts to run rapidly after the next pause. It means that while running, it decides that after the next pause it needs to increase it's speed. Note that it still needs to take the pauses - as it maintains a fixed time interval between them. Contender so keep it.
X(D) This is irrelevant to either of the theory.
(E) Strongly supports Theory (2). So keep it.

Now we are down to choices B,C and E.

X(B) Already undermines (2), so we need to show it supports theory (1). However pausing equally frequently going up or down, at best shows that it doesn't take pause to rest for the moment. It takes pauses for sthg else. So it doesn't support theory (1). Knock it off.
X(E) Supports theory (2), so we need to show it undermines theory (1). However it doesn't even remotely address theory (1). Discard it.
(C) Note that beetles takes the pauses for the fixed time intervals. So it supports theory (1). As addressed earlier it undermines theory (2), since while running it when it sees the prey flee, it takes a pause - for a moment of rest - and then increases its speed. So it is able to process the visual info rapidly.

This question esp (C) has sentence which is confusing to understand, and we may even knock it off for reason that is completely opposite of what the actual reason is. I feel GMAC sometimes to make questions difficult, convolutes the meaning of sentences.

Thanks
Prashant
Re: Tiger beetles are such fast runners that they can capture virtually an   [#permalink] 02 Sep 2012, 00:49

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