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Some species of dolphins find their prey by echolocation:

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New post 29 Apr 2006, 11:48
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E

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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: particularily 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 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 dolphines 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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New post 29 Apr 2006, 13:19
B?

For ecolocation to be useful, if it is true that the prey should not detect the clicking sounds, it means that the prey cannot detect the LOUD sounds too. Hence the conclusion is wrong.
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New post 29 Apr 2006, 14:27
Yes B is the OA.
Thanks for the explanation.
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New post 29 Apr 2006, 15:56
Agree with B
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Some species of dolphins find their prey by echolocation:

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