Some species of dolphins find their prey by echolocation; : GMAT Critical Reasoning (CR)
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# Some species of dolphins find their prey by echolocation;

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Joined: 15 Dec 2003
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Some species of dolphins find their prey by echolocation; [#permalink]

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25 Sep 2004, 19:16
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Some species of dolphins find their prey by echolocation; they emit clicking sounds and listen for echoes returning from distant objects in the water. Marine biologists have speculated that those same clicking sounds might have a second function: particularly loud clicks might be used by the dolphins to stun their prey at close range through sensory overload.

Which of the following, if discovered to be true, would cast the most serious doubt on the correctness of the speculation described above?
A) dolphins that use echolocation to located distant prey also emit frequent clicks at intermediate distances as they close in on their prey
B) the usefulness of echolocation as a means of locating prey depends on the clicking sounds being of a type that the prey is incapable of perceiving, regardless of volume
C) if dolphins stun their prey, the effect is bound to be so temporary that stunning from far away, even if possible, would be ineffective
D) echolocation appears to give dolphins that use it information about the richness of a source of food as well as about its direction
E) the more distant a dolphin's prey, the louder the echolocation clicks must be if they are to reveal the prey's presence to the hunting dolphin
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25 Sep 2004, 20:57
B for me too. If the sounds from Dolphins is primarily for its search of the prey without the prey knowing about it (as the prey cant hear it as per B) -the question of it(prey) getting stunned will be a 'wrong' speculation (especially if the function of 'loud' clicks is to stun the prey).

B also makes one believe that in the event the prey does not hear the sound from the Dolphin, the prey can be stunned by the Dolphin not necessarily by a 'loud' click.
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26 Sep 2004, 05:58
Hi paul ?

Where did u get this Q. is it from paper test ? I remember doing this sometime back.

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26 Sep 2004, 06:18
Yes, this is from paper test and OA is B. Good job all
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Best Regards,

Paul

26 Sep 2004, 06:18
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