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Australian researchers have discovered electroreceptors

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Australian researchers have discovered electroreceptors [#permalink] New post 07 Jul 2013, 08:53
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Australian researchers have discovered
electroreceptors (sensory organs designed to respond
to electrical fields) clustered at the tip of the spiny
anteater's snout. The researchers made this discovery
by exposing small areas of the snout to extremely
weak electrical fields and recording the transmission
of resulting nervous activity to the brain. While it is
true that tactile receptors, another kind of sensory
organ on the anteater's snout, can also respond to
electrical stimuli, such receptors do so only in
response to electrical field strengths about 1,000
times greater than those known to excite
electroreceptors.

Having discovered the electroreceptors,
researchers are now investigating how anteaters
utilize such a sophisticated sensory system. In one
behavioral experiment, researchers successfully
trained an anteater to distinguish between two
troughs of water, one with a weak electrical field and
the other with none. Such evidence is consistent with
researchers' hypothesis that anteaters use
electroreceptors to detect electrical signals given off
by prey; however, researchers as yet have been
unable to detect electrical signals emanating from
termite mounds, where the favorite food of anteaters
live. Still, researchers have observed anteaters
breaking into a nest of ants at an oblique angle and
quickly locating nesting chambers. This ability to
quickly locate unseen prey suggests, according to the
researchers, that the anteaters were using their
electroreceptors to locate the nesting chambers.
101. According to the passage, which of the following is a characteristic that distinguishes electro receptors from tactile receptors?
(A) The manner in which electroreceptors respond to electrical stimuli
(B) The tendency of electroreceptors to be found in clusters
(C) The unusual locations in which electroreceptors are found in most species.
(D) The amount of electrical stimulation required to excite electroreceptors
(E) The amount of nervous activity transmitted to the brain by electroreceptors when they are excited

[Reveal] Spoiler:
D



102. Which of the following can be inferred about the experiment described in the first paragraph?
(A) Researchers had difficulty verifying the existence of electroreceptors in the anteater because electroreceptors respond to such a narrow range of electrical field strengths.
(B) Researchers found that the level of nervous activity in the anteater’s brain increased dramatically as the strength of the electrical stimulus was increased.
(C) Researchers found that some areas of the anteater’s snout were not sensitive to a weak electrical stimulus.
(D) Researchers found that the anteater’s tactile receptors were more easily excited by a strong electrical stimulus than were the electro receptors..
(E) Researchers tested small areas of the anteater’s snout in order to ensure that only electroreceptors were responding to the stimulus.

[Reveal] Spoiler:
C



103. The author of the passage most probably discusses the function of tactile receptors (lines 7-11) in order to
(A) eliminate and alternative explanation of anteaters’ response to electrical stimuli
(B) highlight a type of sensory organ that has a function identical to that of electroreceptors
(C) point out a serious complication in the research on electroreceptors in anteaters.
(D) suggest that tactile receptors assist electroreceptors in the detection of electrical signals.
(E) introduce a factor that was not addressed in the research on electroreceptors in anteaters.

[Reveal] Spoiler:
A



104. Which of the following can be inferred about anteaters from the behavioral experiment mentioned in the second paragraph?
(A) They are unable to distinguish between stimuli detected by their electroreceptors and stimuli detected by their tactile receptors.
(B) They are unable to distinguish between the electrical signals emanating from termite mounds and those emanating from ant nests.
(C) They can be trained to recognize consistently the presence of a particular stimulus.
(D) They react more readily to strong than to weak stimuli.
(E) They are more efficient at detecting stimuli in a controlled environment than in a natural environment.

[Reveal] Spoiler:
C



105. The passage suggests that the researchers mentioned in the second paragraph who observed anteaters break into a nest of ants would most likely agree with which of the following statements?(A) The event they observed provides conclusive evidence that anteaters use their electroreceptors to locate unseen prey.
(B) The event they observed was a typical and may not reflect the usual hunting practices of anteaters.
(C) It is likely that the anteaters located the ants’ nesting chambers without the assistance of electroreceptors.
(D) Anteaters possess a very simple sensory system for use in locating prey.
(E) The speed with which the anteaters located their prey is greater than what might be expected on the basis of chance alone.

[Reveal] Spoiler:
E



106. Which of the following, if true, would most strengthen the hypothesis mentioned in lines 17-19?
(A) Researchers are able to train anteaters to break into an underground chamber that is emitting a strong electrical signal.
(B) Researchers are able to detect a weak electrical signal emanating from the nesting chamber of an ant colony.
(C) Anteaters are observed taking increasingly longer amounts of time to locate the nesting chambers of ants.
(D) Anteaters are observed using various angles to break into nests of ants.
(E) Anteaters are observed using the same angle used with nests of ants to break into the nests of other types of prey.

[Reveal] Spoiler:
B


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Re: Australian researchers have discovered electroreceptors [#permalink] New post 07 Jul 2013, 09:32
my call:

D C A C A B

:-D
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Last edited by blueseas on 07 Jul 2013, 10:38, edited 1 time in total.
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Re: Australian researchers have discovered electroreceptors [#permalink] New post 09 Jul 2013, 01:05
My answers : 1- D 2 - C 3 - B 4 - C 5 - A 6 - D
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Re: Australian researchers have discovered electroreceptors [#permalink] New post 09 Jul 2013, 10:05
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Re: Australian researchers have discovered electroreceptors [#permalink] New post 15 Jul 2013, 09:16
why C is the answer of question 102? isn't D a possible choice??
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Re: Australian researchers have discovered electroreceptors [#permalink] New post 15 Jul 2013, 09:26
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lucasITA wrote:
why C is the answer of question 102? isn't D a possible choice??


102. Which of the following can be inferred about the experiment described in the first paragraph?


(D) Researchers found that the anteater’s tactile receptors were more easily excited by a strong electrical stimulus than were the electro receptors..
==>here it is written that tactile receptors were more easily excited than electro receptors...
but there is no such comparison done that who will be more easily excited


Australian researchers have discovered
electroreceptors (sensory organs designed to respond
to electrical fields) clustered at the tip of the spiny
anteater's snout. The researchers made this discovery
by exposing small areas of the snout to extremely
weak electrical fields and recording the transmission
of resulting nervous activity to the brain. While it is
true that tactile receptors, another kind of sensory
organ on the anteater's snout,can also respondto
electrical stimuli, such receptors do so only in
response to electrical field strengths about 1,000
times greater than
those known to excite
electroreceptors.

hope it helps
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Re: Australian researchers have discovered electroreceptors [#permalink] New post 15 Jul 2013, 09:31
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lucasITA wrote:
why C is the answer of question 102? isn't D a possible choice??



Im not quite sure to understand what do you mean

C say

(C) Researchers found that some areas of the anteater’s snout were not sensitive to a weak electrical stimulus.

Instead D say

(D) Researchers found that the anteater’s tactile receptors were more easily excited by a strong electrical stimulus than were the electro receptors..

Now, tp be honest D is the mostemtive answer choice among the others BUT D talks about electrical stimulus stronger instead the passage talks about

Quote:
such receptors do so only in
response to electrical field strengths about 1,000
times greater than those known to excite
electroreceptors.


is not the same thing at all.........

For C we have
Quote:
The researchers made this discovery
by exposing small areas of the snout to extremely
weak electrical fields and recording the transmission
of resulting nervous activity to the brain


That's it. Hope is fine my explanation
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Re: Australian researchers have discovered electroreceptors [#permalink] New post 19 Jul 2013, 02:38
101.d
102.c
103.a
104.c
105.c :shock: :shock: (never saw this coming!!) :cry:
106.B

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Re: Australian researchers have discovered electroreceptors [#permalink] New post 20 Aug 2013, 21:08
For question 5, I picked A, but the OA is E. Any explanation to this question?
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Re: Australian researchers have discovered electroreceptors [#permalink] New post 21 Aug 2013, 18:47
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Juz2play wrote:
For question 5, I picked A, but the OA is E. Any explanation to this question?


Just check the last two lines of the last para.

Still, researchers have observed anteaters
breaking into a nest of ants at an oblique angle and
quickly locating nesting chambers. This ability to
quickly
locate unseen prey suggests, according to the
researchers, that the anteaters were using their
electroreceptors to locate the nesting chambers.

Even I chose A but then re read the last paragraph when I found my answer incorrect.
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Re: Australian researchers have discovered electroreceptors [#permalink] New post 09 Sep 2013, 05:46
Can someone explain option 103, and 105 please?
I chose E and A respectively.
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Re: Australian researchers have discovered electroreceptors   [#permalink] 09 Sep 2013, 05:46
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