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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] New post 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.

Please explain the answers.
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Re: Tiger beetles are such fast runners that they can capture [#permalink] New post 18 Apr 2012, 10:09
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
Please explain the answers.

OA Please
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Re: Tiger beetles are such fast runners that they can capture [#permalink] New post 18 Apr 2012, 14:23
Re: Tiger beetles are such fast runners that they can capture   [#permalink] 18 Apr 2012, 14:23
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