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# Tiger beetles are such fast runners that they can capture

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Tiger beetles are such fast runners that they can capture [#permalink]

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16 Jul 2007, 11:40
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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.

OG2013 Diagnostic V25
[Reveal] Spoiler: OA

Last edited by hazelnut on 23 Apr 2017, 05:59, edited 3 times in total.
Updated OA
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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18 Apr 2012, 10:09
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vina wrote:
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?

IMO B

Two hypo: 1) Beetle stops to take rest
2) It stops to adjust with changing visual information

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.

from first part of the sentence,it seems that beetle is frightened by insect and hence runs away, but that is not the case.Henec does not support 2nd hypo. Although, 2nd part of sentence undermines the 1st hypo.

B In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses.

1st part of sentence undermines 2nd hypo, and second part supprts 1st hypo

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.
chase up down irrelevnet

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

E The faster a beetle pursues an insect fleeing directly away from it, the more frequently the beetle stops.
Does not undermine any of two hypo

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

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18 Apr 2012, 14:23
looks like the answer is B!
check in the manhattan posts.
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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06 Dec 2012, 09:08
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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 frequentlywhether 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.
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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06 Dec 2012, 11:11
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nelz007 wrote:
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.

I ll take one question at a time......
As per question we have to select an option that strengthens one and undermines the other.......Its better to take a note of both the hypothesis
1st one: Perhaps the beetles cannot maintain their pace and must pause for a moment’s rest. <<In simple terms it says it stops so as to gain more energy>>
2nd one : tiger beetles are unable to adequately process the resulting rapidly changing visual information and so quickly go blind and stop.<<it says that beetle is blind so it stops and than run>>
I think its clear that B and C are contenders.... Lets take one by one.

(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. the portion which is highlighted is extremely important should be read and comprehend very carefully. Normally running downhill does not require too much energy its an established fact. If the beetle stops while running downhill that means it gets tired when moving down. When it is running up the incline compared to downward chase should stop for more time but as mentioned in the argument it stops for the same interval. Hence its contradictory to an established fact, Moreover it is neither strengthening the hypothesis that deals with energy nor does it weakens.
Hence weaken dump this option choice.

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

The bold portion weakens the fact that the beetle is blind since it alters its course while chasing and the underlined portion strengthens the fact that it stops to take rest.
Hence B is the right answer.

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

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06 Dec 2012, 11:27
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nelz007 wrote:
In the past, most children who went sledding in the winter snow in Verland used wooden sleds with runners and steering bars. Ten years ago, smooth plastic sleds became popular; they go faster than wooden sleds but are harder to steer and slow. The concern that plastic sleds are more dangerous is clearly borne out by the fact that the number of children injured while sledding was much higher last winter than it was 10 years ago.

Which of the following, if true in Verland, most seriously undermines the force of the evidence cited?

(A) A few children still use traditional wooden sleds.
(B) Very few children wear any kind of protective gear, such as helmets, while sledding.
(C) Plastic sleds can be used in a much wider variety of snow conditions than wooden sleds can.
(D) Most sledding injuries occur when a sled collides with a tree, a rock, or another sled.
(E) Because the traditional wooden sleds can carry more than one rider, an accident involving a wooden sled can result in several children being injured.

need detailed explanations. Thanks!

Hi nelz
this one i dont think is tough....
Injury cases involving children sledding on plastic sleds as compared to cases in which wooden sleds were used is fewer. Hence plastic sleds are dangerous is unjustified.

Though through POE only B and C are left. B is totally out of scope hence only C remains and can be the answer..

For sake of explanation i try to elaborate why i consider C as the correct answer.
(C) Plastic sleds can be used in a much wider variety of snow conditions than wooden sleds can. We have to weaken the fact that since no accident
in past can be referred in which child was sledding on plastic sleds hence plastic sled is not dangerous.
May be that plastic sleds are used in a snow condition that is not prone to accident as it can be used in different snow conditions. But this does not establishes the fact that it is not dangerous... may be until now it is never used in a condition which is prone to accident.

--------------------------------------------
Consider Kudos if my post helped!!
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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06 Dec 2012, 11:31
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In the past, most children who went sledding in the winter snow in Verland used wooden sleds with runners and steering bars. Ten years ago, smooth plastic sleds became popular; they go faster than wooden sleds but are harder to steer and slow. The concern that plastic sleds are more dangerous is clearly borne out by the fact that the number of children injured while sledding was much higher last winter than it was 10 years ago.

Which of the following, if true in Verland, most seriously undermines the force of the evidence cited?

(A) A few children still use traditional wooden sleds.
(B) Very few children wear any kind of protective gear, such as helmets, while sledding.
(C) Plastic sleds can be used in a much wider variety of snow conditions than wooden sleds can.
(D) Most sledding injuries occur when a sled collides with a tree, a rock, or another sled.
(E) Because the traditional wooden sleds can carry more than one rider, an accident involving a wooden sled can result in several children being injured.

We need to weaken the evidence and not conclusion.
Conclusion: The concern that plastic sleds are more dangerous.
Evidence: the number of children injured while sledding was much higher last winter than it was ten years ago.

Close between B and C
C is the only choice that weakens evidence by providing an alternative .
B dont report any time frame. Is this habit old or new? B out
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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06 Dec 2012, 20:13
Archit143 wrote:
nelz007 wrote:
In the past, most children who went sledding in the winter snow in Verland used wooden sleds with runners and steering bars. Ten years ago, smooth plastic sleds became popular; they go faster than wooden sleds but are harder to steer and slow. The concern that plastic sleds are more dangerous is clearly borne out by the fact that the number of children injured while sledding was much higher last winter than it was 10 years ago.

Which of the following, if true in Verland, most seriously undermines the force of the evidence cited?

(A) A few children still use traditional wooden sleds.
(B) Very few children wear any kind of protective gear, such as helmets, while sledding.
(C) Plastic sleds can be used in a much wider variety of snow conditions than wooden sleds can.
(D) Most sledding injuries occur when a sled collides with a tree, a rock, or another sled.
(E) Because the traditional wooden sleds can carry more than one rider, an accident involving a wooden sled can result in several children being injured.

need detailed explanations. Thanks!

Hi nelz
this one i dont think is tough....
Injury cases involving children sledding on plastic sleds as compared to cases in which wooden sleds were used is fewer. Hence plastic sleds are dangerous is unjustified.

Though through POE only B and C are left. B is totally out of scope hence only C remains and can be the answer..

For sake of explanation i try to elaborate why i consider C as the correct answer.
(C) Plastic sleds can be used in a much wider variety of snow conditions than wooden sleds can. We have to weaken the fact that since no accident
in past can be referred in which child was sledding on plastic sleds hence plastic sled is not dangerous.
May be that plastic sleds are used in a snow condition that is not prone to accident as it can be used in different snow conditions. But this does not establishes the fact that it is not dangerous... may be until now it is never used in a condition which is prone to accident.

--------------------------------------------
Consider Kudos if my post helped!!

I was debating between C and E. I realized, my mistake didn't understand the argument to well. Thanks for the explanation! I've noticed though in the most seriously weakens question there are usually 2 weakener's present, have to pick the stronger one...

@Bangon thanks for pointing out the conclusion / evidence part that was a silly error on my part!
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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04 Oct 2013, 08:12
vina wrote:
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.

OA please? This one was a bit tough.. I ultimately chose (E) because the pace has to do with the frequency it stops therefore strengthening one of the hypotehsis
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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04 Oct 2013, 08:12
vina wrote:
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.

This time I did it I chose (E). Funny thing, anyways. Need a clear explanation on this one and i'll make it rain some Kudos

Last edited by jlgdr on 14 Oct 2013, 12:17, 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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10 Oct 2013, 00:47
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This is my point of view for this really hard question:

We have to chose whether the tiger beetles is following one of the two hypothesis proposed. In fact, this question is simple when you take the words that are in the text. The first hypothesis states that the TB cannot maintain their pace and pause for moments of rest. The second states that rapidly changes in visual information lead to the blindness of the TB and then the TB has to STOP.

Therefore :

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. totally irrelevant
B In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses. wrong, because the statement two STATES THAT THE TB NEEDS TO STOP. Here they are saying that TB, following the visual change still continues to follow the prey and do not stop
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. CORRECT, this answer choice is saying that the statement one is correct and the second two need to be wrong while the TB do not stop
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. Irrelevant
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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30 Oct 2013, 13:27
I would say D. Try and find a case where both hypothesis cannot be true together:

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.

This tells us that the beetle is not blind. However, it does not give us any evidence on that pace has been increased. Inconclusive.

B In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses.

The beetle can clearly see, however, the frequent pauses cannot be attributed to the beetle running at a faster pace than normal. Inconclusive.

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.

The beetle is clearly not blind, however, pausing cannot be attributed to change of pace. Inconclusive.

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

This tells us that the beetle must be blind. If the beetle was not blind, and could see the prey, it would increase its speed and have more frequent stops. However, by being blind, the beetle runs, only to see the prey just as far away as before its run. Therefore, the beetle did not see the pray move and is confused as to why it has not gained on it. This discourages the beetle. This statement tells us that the beetle stops to look for location of the prey, not due to exhaustion.

E The faster a beetle pursues an insect fleeing directly away from it, the more frequently the beetle stops.

We cannot tell if the beetle is blind or not. Perhaps the frequent stops are due to the beetle checking for the insect. Perhaps It is due to change of pace. Inconclusive.
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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30 Oct 2013, 15:32
forevertfc wrote:
I would say D. Try and find a case where both hypothesis cannot be true together:

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.

This tells us that the beetle is not blind. However, it does not give us any evidence on that pace has been increased. Inconclusive.

B In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses.

The beetle can clearly see, however, the frequent pauses cannot be attributed to the beetle running at a faster pace than normal. Inconclusive.

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.

The beetle is clearly not blind, however, pausing cannot be attributed to change of pace. Inconclusive.

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

This tells us that the beetle must be blind. If the beetle was not blind, and could see the prey, it would increase its speed and have more frequent stops. However, by being blind, the beetle runs, only to see the prey just as far away as before its run. Therefore, the beetle did not see the pray move and is confused as to why it has not gained on it. This discourages the beetle. This statement tells us that the beetle stops to look for location of the prey, not due to exhaustion.

E The faster a beetle pursues an insect fleeing directly away from it, the more frequently the beetle stops.

We cannot tell if the beetle is blind or not. Perhaps the frequent stops are due to the beetle checking for the insect. Perhaps It is due to change of pace. Inconclusive.

If you want better and more "official" explanations: http://www.manhattangmat.com/forums/tig ... t3238.html

OA is C!

Hope it helps!
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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05 Nov 2013, 16:50
Paris75 wrote:

If you want better and more "official" explanations: http://www.manhattangmat.com/forums/tig ... t3238.html

OA is C!

Hope it helps!

I just came across this in the OG, and in fact the OA is B!

I see that it has also been revised to say so on the link you provided.
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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07 Nov 2013, 01:40
forevertfc wrote:
Paris75 wrote:

If you want better and more "official" explanations: http://www.manhattangmat.com/forums/tig ... t3238.html

OA is C!

Hope it helps!

I just came across this in the OG, and in fact the OA is B!

I see that it has also been revised to say so on the link you provided.

Watch out, there are several types of the same question (one in the OG, one on the the GmatPrep...) ... And all the answers are not C!

Hope it helps!
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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04 Mar 2014, 12:26
the answer on the official guide is B, the explanation was cause the beetle has to stop to adjust the erratic movements going on around which "increases the frequency to sort out the erratic visual motion."
seriously, this is not a well-written question. The GMAC would be definately assuming that turning round produces erratic visual motion. How would a dog that chases its tail be explained?
Plus it doesn't support the other hypothesis as required by the question.
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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21 Jul 2014, 10:38
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vina wrote:
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.

Two hypothesis:
1) Pauses to rest
2) Pauses to determine the visual information

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.
1) if the beetle pauses to rest , how can it move away without pausing? - Doesn't support
2) If the beetle pauses to determine the visual information, how come the beetle goes away. It should pause and figure out the new information - Doesn't support

B In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses.
1) Pauses to rest -> The pausing should not be more frequent but constant -> Doesn't support
2) Pauses to determine the visual information. As the motion is swerving, the visual information changes quite frequently and supports the 2nd hypothesis

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.
1) Pauses to rest -> Cannot pause equally frequently in both up slope and down slop -> Doesn't support
2) Pauses to determine the visual information -> "a beetle usually responds immediately to changes in the insect's direction" -> Doesn't support

D If, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit.
1) Pauses to rest -> above information doesn't support
2) Pauses to determine the visual information -> Above information doesn't support

E The faster a beetle pursues an insect fleeing directly away from it, the more frequently the beetle stops.
1) pauses to rest -> faster the beetle pursues , frequently it stops -. Supports the hypothesis
2) pauses to determine the visual information -> faster it pursues -> faster the visual information changes and more frequently it stops -> Supports the hypothsis

hence B)
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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06 Jul 2015, 06:11
1
KUDOS

As per OG 2015--it's B and i can prove it...

*TB Runs fast (fact)
*Tb can catch any virtually I. (Fact)
BUT
BT can't maintain its pace,it pauses momentarily before attacking the pray ( fact)

There could be 2 reasons.

1) it can't maintain it's pace and need to halt before catching the prey
2) it runs so fast that can't see things around and thus it halts, sees the prey and then attack.

Now as per an experiment would one of the reasons be weaken and other would be strengthen.

the weapon we have to attack this problem is pace or sight issue.

either BT can move freely doesn't have any problem and cant see the prey while hunting
Or BT has moving issue, can't maintain the pace but can see the prey clearly.

1 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.

While hunting, BT Stops and runs away...it proves that BT doesn't have pace issue but what about sight..NOT MENTIONED ---Thus Wrong

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

BT changes course while running, means it can move freely and can change directions, however as it moves,it pauses, that means he has to stop to see the prey... thus we got the answer pace doesn't have any issue but it's the sight issue.

3) 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.

BT can respond quickly as the prey changes it's movement- thus no issue with pace,
and it pauses frequent when chase is up down an incline-- that means BT can adjust pace without any sight issue- since there's no pace or sight issue--there's no problem

D and E are irrelevant or out of scope.

And please make the correction with this question as the correct answer is B, however on this forum the correct answer that reflects is C..
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Re: Tiger beetles are such fast runners that they can capture [#permalink]

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12 Oct 2015, 01:14
vina wrote:
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.

A>> if the beetle immediately stops and runs away without stopping>> that means it is not a blind, neither does need rest, bc it runs away w/o stopping
B>>In pursuing, changing course of action may indicate that a beetle goes blind, but if pauses become more frequent, that may indicate that it need to rest
C>>If beetle responds the change of course of direction, that means it can see where the insect goes. and if pauses are frequent that means the beetle loses its pace and need rest. NOT a blind, BUT need rest
D>>It can be either blind or need to rest if the beetle stops chasing
E>> If more frequently the beetle stops it means that it needs to rest. But that does not mean it is a blind. we cannot prove or disprove whether it is blind.

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

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09 Jan 2016, 06:00
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Re: Tiger beetles are such fast runners that they can capture   [#permalink] 09 Jan 2016, 06:00

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