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# Tiger beetles are such fast runners that they can capture

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23 Dec 2012, 06:36
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The answer to question posted by me is C.
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23 Dec 2012, 06:46
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carcass wrote:
Sorry marcab great question.

But according to the mgmat forum the question has this answers

Quote:
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.

OA here is C and in your question is B. So the definitive answer should be B (my answer too)

Correct me if i'm wrong

OA there is B.

http://www.manhattangmat.com/forums/tig ... t3238.html

But here, in this question, the choices are very different.
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23 Dec 2012, 07:21
well I agree.

i noticed it but the choices are quite similar and the stimulus is the same and answer C (MGMAT forum) here is B, and at the same time your OA is C. I know that there are variations of the same question, but after all is a bit confuse.

Anyway, Great job. kudos
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23 Dec 2012, 12:52
dentobizz wrote:
C does weaken the first hypothesis that beetles get tired and need rest , how does is strengthen hypothesis 2?

Hi Marcab,
When I first read this question I thought it was the same as in the CR section of DT from OG12 , hence I assumed the OA to be B. I went through the answer choices only to realize that these are two different sets and OA here is C, so I mentioned the other question avoid any future confusion to other posters as well. Anyway moving forward . I agree that C weakens the hypothesis that beetles get tired and need rest but how does it strengthen the hypothesis about vision difficulty?
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23 Dec 2012, 19:52
@dentobizz....thats the thing I am still looking for and thats why I posted the question.
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24 Dec 2012, 02:56
C] the beetle maintains fixed time interval b/w pauses---this helps us to think that beetle is not tried, otherwise the frequency or duration of pauses would increase,this will weaken the tiredness hypothesis

, although when an insect that had been stationary begins to flee, the beetle increases its speed after its next pause.---may be this points out to the fact that beetle can increase it speed ONLY after it has adjusted the visual filed ie after its next pause. this will strengthen the eye problem hypothesis

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24 Dec 2012, 03:22
dentobizz wrote:
C] the beetle maintains fixed time interval b/w pauses---this helps us to think that beetle is not tried, otherwise the frequency or duration of pauses would increase,this will weaken the tiredness hypothesis

, although when an insect that had been stationary begins to flee, the beetle increases its speed after its next pause.---may be this points out to the fact that beetle can increase it speed ONLY after it has adjusted the visual filed ie after its next pause. this will strengthen the eye problem hypothesis

C. 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 its next pause.

Let us analyze the problem in greater detail

What are the factors given in the question that affect the rest theory ?

1. Speed. Greater the speed more the need for rest
2. Time. More time chasing more the need for rest

What are the factors given in the question that affect the visual information theory?

1. Speed. Greater the speed more difficult to process visual information
2. Change in direction of the insect. Makes difficult the processing of visual information.

Let us now analyze choice C.

That the beetles maintain a fixed time interval between pauses says that the time factor doesn't affect them. So the rest theory is weakened and the second part although when an insect that had been stationary begins to flee, the beetle increases its speed after its next pause. says that the beetle which is stationary and then starts to move cannot initially move at the normal speed because it has to process visual information at a markedly higher rate.

I very much agree with dentobizz's explanation.

A very difficult problem but I would still say not totally free of flaws.
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24 Dec 2012, 03:39
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to avoid all the heavy and convoluted reasoning one could solve this problem by eliminating wrong options.A E and D can be ruled out easily.If you can eliminate B by the incline logic.then ur only left with C.Job done!

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03 Jan 2013, 21:14
Hi ,
Just to get a closure on this question ,there is the explanation given by Ron regarding this cr problem.

"the problem with choice (b) is that it works against both hypotheses.
* the "immediate response" part works against the blindness hypothesis. (if the beetles went blind while running, they wouldn't change direction until they paised to regain their eyesight.)
* the "pausing equally often up or down an incline" part works against the moment's rest hypothesis. (it's harder to run up an incline than to run down one. so, according to the "they get tired" hypothesis, the beetle should have to stop more often if it's running up an incline.)

choice (c) is the one you want.
* the beetle reacts after it pauses, thus supporting the idea that it's blind (and so unable to react) until it pauses. (i.e., the increase in speed is not immediate; the beetle doesn't know that it's supposed to run faster until it has stopped and looked.)
* according to this information, the rest interval between pauses is fixed. note that this is true even when the beetle runs faster, as described -- an observation that undermines the "moment's rest" hypothesis. (according to the "beetle gets tired" hypothesis, the beetle should have to stop after less time if it's running faster.)

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04 Jan 2013, 02:50
The answer is clearly (B) here as per the question posted by Marcab . This is the only option which strengthens one hypothesis and weakens the other hypothesis .

No other option does that.
I am still confused wth the OA.

Marcab , could you please post the OA once more ? is it (c) or (b)
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04 Jan 2013, 07:34
Marcab wrote:
The answer to question posted by me is C.

Hi,
practicegmat, this is a gmatprep question and the official answer is C . Explanation for this is given above.

HTH
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04 Jan 2013, 07:46
OA of the original question here is C.
Guys, again mentioning, there is another question from GMAT prep with the same stimulus but different answer choices and answer to that question was B. Here the choices are indeed very different.
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07 Jan 2013, 19:27
I agree completely with Ron's explanation (posted by Dentobizz) for the version where C is the answer. I found that answer confusing because of the "next pause" wording. Now I see that it makes sense: The prey insect starts to flee while the tiger beetle is running, and the tiger beetle can't see it. When the tiger beetle pauses to look again, it sees that the prey is further away - so it speeds up. This supports the "visual overload" hypothesis, as Ron says. And the fact that the interval between pauses does NOT get shorter goes against the "getting tired" hypothesis.
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07 Jan 2013, 20:00
The problem for the beetle seems to be at the start of the chase , with regard to speed. So when after being stationary it starts moving there is an abrupt change in visual information which it is not able to process properly and results in lower speed. The difference between being stationary and the pauses is that in the latter it is still processing the previous information and as that happens in a moment it starts chasing again and there is a sort of continuity and not an abrupt change in the visual information even after the pause. So it can move at a higher speed after the first pause.
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07 Jan 2013, 20:28
SravnaTestPrep wrote:
The problem for the beetle seems to be at the start of the chase , with regard to speed. So when after being stationary it starts moving there is an abrupt change in visual information which it is not able to process properly and results in lower speed. The difference between being stationary and the pauses is that in the latter it is still processing the previous information and as that happens in a moment it starts chasing again and there is a sort of continuity and not an abrupt change in the visual information even after the pause. So it can move at a higher speed after the first pause.

To add to my explanation, in the "visual theory", we know that the beetle reduces its speed and come to a halt with rapidly changing visual information. So change in visual information has an impact on speed. So we would expect the start of the chase to be slow if the visual theory is true.
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07 Jan 2013, 20:55
Is the question wrong?
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07 Jan 2013, 21:23
rohantiwari wrote:
Is the question wrong?

This in fact is a good question:-) As I mentioned elsewhere the question is not free of flaws and it is not easy to arrive at the correct answer.
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07 Jan 2013, 22:12
@rohantiwari pls see the posts above the OA is 'C' and this is a Official gmatprep question so it can't be wrong. Hope its clear

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08 Jan 2013, 00:24
Marcab wrote:
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. 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.
C. 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 its next pause.
D. If, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit.
E. When an obstacle is suddenly introduced just in front of running beetles, the beetles sometimes stop
immediately, but they never respond by running around the barrier.

OA
[Reveal] Spoiler:
soon

Though the same stimulus is available with different answer choices, I found this one to be a tough one. Explanations will be appreciated.

The first part of choice C says that the beetles maintain fixed time interval between pauses. So irrespective of how different the variations may be in the visual information between pauses, the vision is maintained in that interval. So it doesn't seem logical that the beetle wouldn't be able to see an insect that has been stationary which then starts to flee. There would be no need to increase the speed after the next pause. In my view C doesn't directly support the visual theory. "Although,... the beetle increases its speed" in the second part can at best be used as an additional support to undermine the rest theory.

Looks like it is a messed up question.
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Last edited by SravnaTestPrep on 09 Jan 2013, 01:07, edited 1 time in total.
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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08 Jan 2013, 03:07
"they can capture virtually any nonflying insect."

C. 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 its next pause.

is'nt C against the premise above?
Re: Tiger beetles are such fast runners that they can capture   [#permalink] 08 Jan 2013, 03:07

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