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

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Some species of dolphins find their prey by echo-  [#permalink]

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19 Apr 2004, 21:32
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Some species of dolphins find their prey by echo-
location; 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

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 locate 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 dolphinтАЩs prey, the louder
the echolocation clicks must be if they are to
reveal the preyтАЩs presence to the hunting
dolphin.
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20 Apr 2004, 03:48
Agree with B. If preys cannot perceive the clicking sounds then it directly contradicts the argument of sensory overload in the stem.
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Last edited by Paul on 20 Apr 2004, 04:24, edited 1 time in total.
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20 Apr 2004, 03:57

E also seems a good choice...
E says that the farther the prey is, the louder the sound. So we can conclude that as the Dolphin reaches near the prey, it will NOT emit Louder sound but a sound lower in volume which contradicts what is said in the argument.
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20 Apr 2004, 04:15
A sound lower in volume as the prey is within close range does not necessarily contradicts the argument. The volume could still be enough within close range for the prey to undergo sensory overload
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20 Apr 2004, 08:53
I take this opportunity( Elections in India) to cast my vote for B.
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20 Apr 2004, 17:00
A just reinforces the statement that as dolphins close in on their prey, they try to overload the latter with signals. It does not weaken the argument that loud clicks might be used by the dolphins to stun their prey at close range through sensory overload; it in fact supports it.
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