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Re: Tiger beetles are such fast runners that they can capture virtually an
[#permalink]
05 Jun 2020, 23:44
05 Jun 2020, 23:44
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.
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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.
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https://gmatclub.com/forum/tiger-beetles ... 25607.html
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Let's make it easy ::D
Target is to undermine/weaken one and strengthen other
A)It can see, It can run without pause+It can see >>> weaken both
B)swerving =changing directions; It follows prey>>> can see>> weaken ;
;pauses become more frequent>> that it tires and stops frequetly>>strengthens
C)Can see>> weaken; irrespective of altitude pauses >> itsn't tiring >> weaken
D)It can see>>>no info ! It pauses >>>no info>>>>>OUT OF SCOPE
E)
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Re: Tiger beetles are such fast runners that they can capture virtually an
[#permalink]
28 Dec 2020, 11:53
28 Dec 2020, 11:53
I found this question challenging for all of the reasons mentioned in this post, but the more I reflect on this question, the more I think that we're actually looking for "the best of the worst" when it comes to selecting answer choices. What I mean by this is that our confidence in selecting the right answer choice come from our confidence in eliminating incorrect answer choices.
This question asks us to identify the answer choice that supports one of the two hypotheses and undermines the other. We can either prove that the beetles must rest because they can't maintain their pace and disprove that that beetles go blind and stop, or vice versa.
(A) - Incorrect - This talks about a situation outside of the pursuit. Despite this, if still try to infer based on the given information, then it potentially indicates that both hypotheses are disproved because the beetle is running and doesn't stop. Either way, this is a poor answer choice.
(B) - Correct - This suggests to me that the beetle responds to visual information i.e. doesn't go blind, and that its stops become more frequent as the chase progresses (because it gets more tired as the chase goes on). This is definitely a vague and awkward answer choice, but I'll put a question mark on it and look at the remaining answer choices.
(C) - Incorrect - This disproves both hypotheses.
(D) - Incorrect - This doesn't do much to prove/disprove either hypothesis. If anything it could suggest that the beetle gets tired as a result of the pursuit, but this still doesn't indicate that the beetle pauses during the pursuit out of tiredness.
(E) - Incorrect - This disproves neither of the two hypotheses. We still don't know why the beetle stops. Both explanations could be valid.
Hence, the answer must be B! Even if it doesn't make a huge amount of sense, we know that A, C, D and E are all definitely wrong, so B must be the correct answer.
This question asks us to identify the answer choice that supports one of the two hypotheses and undermines the other. We can either prove that the beetles must rest because they can't maintain their pace and disprove that that beetles go blind and stop, or vice versa.
(B) - Correct - This suggests to me that the beetle responds to visual information i.e. doesn't go blind, and that its stops become more frequent as the chase progresses (because it gets more tired as the chase goes on). This is definitely a vague and awkward answer choice, but I'll put a question mark on it and look at the remaining answer choices.
Hence, the answer must be B! Even if it doesn't make a huge amount of sense, we know that A, C, D and E are all definitely wrong, so B must be the correct answer.
Re: Tiger beetles are such fast runners that they can capture virtually an
[#permalink]
29 Jan 2023, 05:01
29 Jan 2023, 05:01
KarishmaB wrote:
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.
Please explain the answers.
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.
Responding to a pm:
The OA given in the book is (B) and that is non debatable.
There are two hypotheses:
- the beetles cannot maintain their pace and must pause for a moment's rest;
- while running, tiger beetles are unable to adequately process the resulting rapidly changing visual information and so quickly go blind and stop
What would support one of the two hypotheses and undermine the other?
(B) In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the chase progresses.
If the beetle alters its course while running, it is obviously processing changing visual information and changing its course accordingly WHILE running.
If it pauses more frequently as the chase progresses, it is tiring out more and more because of the long chase and hence taking more frequent breaks.
Option (B) strengthens "it cannot maintain its speed and pauses for rest" and undermines "it cannot process rapidly changing visual information"
(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.
This undermines both the hypotheses.
If it responds immediately to changes in direction, it is able to process changing visual information.
If it takes similar pauses going up or down, it is not the effort of running that is making it take the pauses. Otherwise, going up it would have taken more pauses since it takes more effort going up.
(D) If, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit.
It might strengthen that the beetle is not able to respond to changing visual information since it decides whether it is giving up or not after pausing (in case there is a certain stance that tells us that it has paused) but it doesn't undermine that it pauses to rest. It is very possible that it pauses to rest and at that time assesses the situation and decides whether it wants to continue the chase.
(E) The faster a beetle pursues an insect fleeing directly away from it, the more frequently the beetle stops.
This strengthens both the hypotheses. The faster it runs, the more rest it would need. The faster it runs, the more rapidly visual information would change and more it will need to pause.
Only option (B) strengthens one and undermines the other.
Answer (B)
I have a doubt with D.
Question Stem: TB can capture virtually any insect.
Option D: If, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit
TB pauses, and it paused either it is tired or to process the visual information
Say it paused because it is tired, therfore ended the pursuit
On the other hand
Say it paused because it is processing the visual information, then why would it end the pursuit? Since the question stem says that it can capture any insect.
