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Dolphins

Expert replies
by fighting_cax » Sat Nov 15, 2008 12:46 am
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 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 dolphin's prey, the louder the echolocation clicks must be if they are to reveal the prey's presence to the hunting dolphin.

OA: B

Please explain.
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Source: — Critical Reasoning |

by raunekk » Sat Nov 15, 2008 2:37 am
imo:B

particularly loud clicks might be used by the dolphins to stun their prey at close range through sensory overload.


A) Dolphins that use echolocation to locate distant prey also emit frequent clicks at intermediate distances as they close in on their prey.-- no use of additional information-neither strengthens or weakens.

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. --correct.

As the prey is incapable of perceiving the sound ,regardless of higher or lower volume,the speculation that the clicking sound is used to stun the prey is wrong


(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--not applicable. It talks about the after effect.

( D) Echolocation appears to give dolphins that use it information about the richness of a source of food as well as about its direction. -- out of scope.
(doesnt weaken in any ways)

(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. --talks about the intensity of the clicks needed to locate the prey.
-Doesnt help in any ways
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by peter.p.81 » Wed May 11, 2016 3:03 am
Answer B seems to be logical one out of other answer choices
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