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# Some species of dolphins find their prey by echo-

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SVP
Joined: 16 Oct 2003
Posts: 1798

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

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11 Jul 2004, 21:50
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Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

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10. 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 dolphinâ€™s prey, the louder
the echolocation clicks must be if they are to
reveal the preyâ€™s presence to the hunting
dolphin.

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Manager
Joined: 02 Jun 2004
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Location: san jose,ca

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11 Jul 2004, 22:04
C.

I did not read D and E beacuse I felt if C is true, then the argument of second function is clearly wrong.

Took lil less than 2 mins
_________________

GS
No excuses - Need 750!!!

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Senior Manager
Joined: 25 May 2004
Posts: 281

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Location: Ukraine

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12 Jul 2004, 00:23
B. If B is true, then dolphins do not use loud clicks to stun their prey.

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Manager
Joined: 02 Jul 2004
Posts: 217

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12 Jul 2004, 02:19
B

B states that prey is not sensitive to dolphins' sounds and therefore cannot be stunned by them

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Director
Joined: 13 Nov 2003
Posts: 957

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Location: Florida

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12 Jul 2004, 08:59
B for me.
prey can't perceive the sound, thus can't be stunned by the sound

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12 Jul 2004, 08:59
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# Some species of dolphins find their prey by echo-

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