PrepTest 107, Section 2, Question 20
Scientists have long known that the soft surface(465 more words not shown)
It can be inferred from(11 more words not shown)
- Acapture prey that(3 more words not shown)
- Bdistinguish one kind(4 more words not shown)
- Cdetect electric fields(4 more words not shown)
- Dstimulate its(1 more words not shown)
- Epick up the(4 more words not shown)
Reading the passage
Patrolling comes before the focused search. The platypus swims with its bill moving from side to side, then an electric field can trigger the switch to searching. That suggests it is patrolling to detect a signal from potential prey, before homing in and seizing it.
Working the answers
- A
Capturing already detected prey comes later. Patrolling is the earlier stage of finding it.
- B
Nothing says the animal is sorting one kind of prey from another. The research concerns detecting potential food in the first place.
- CCorrect
Scheich triggers the transition from patrolling to searching with an electric field, and shrimp produce fields that elicit the same response. That connects the patrolling behavior to detecting prey's electrical signals.
- D
Mechanoreceptors respond to physical pressure. The experiment explaining the switch involves electric fields rather than an attempt to stimulate touch receptors.
- E
Scent isn't the cue described. The opening says the nostrils are sealed underwater, and Scheich's experiment supports electrical detection.
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