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Australian researchers have discovered electroreceptors

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Australian researchers have discovered electroreceptors [#permalink] New post 15 Sep 2012, 06:19
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

(5) 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

( 10) 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

(15) 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,

( 20) 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 quickly

(25)to locate unseen prey suggests, according to the researchers, that the anteaters were using their electroreceptors

to locate the nesting chambers.


Q1. The author of the passage most probably discusses the function of tactile receptors 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
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Re: Reading comprehension: Anteaters and Australian reseachers [#permalink] New post 15 Sep 2012, 06:30
Q2. 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 electroreceptors.
(E) Researchers tested small areas of the anteaters snout in order to ensure that only electroreceptors were responding to the stimulus
Answer - C

Q3 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:-
(A) The event that observed provides conclusive evidence that anteaters use their electroreceptors to locate unseen preys
(B) The event they observed was atypical and may not reflect the usual hunting practices of the 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.
Answer - E

Q4 Which of the following if true would most strengthen the hypothesis mentioned in the second para?
(A) Researchers are unable 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 chamber of ants
(D) Anteaters are observed using various angles to break into the 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.
Answer - B
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Re: Australian researchers have discovered electroreceptors [#permalink] New post 21 Sep 2012, 23:22
3 -->E
4 --> B

OA please
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Re: Australian researchers have discovered electroreceptors [#permalink] New post 22 Sep 2012, 02:39
abhishekkpv wrote:
3 -->E
4 --> B

OA please


spot on... but please explain
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Re: Australian researchers have discovered electroreceptors [#permalink] New post 26 Sep 2012, 04:59
1.A
2.C
3.E
4.B

OA's please
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Re: Australian researchers have discovered electroreceptors [#permalink] New post 01 Oct 2012, 00:38
Q3: Last line of the passage clearly suggests that the researchers are agreeing that anteaters located the chambers quickly because of electroreceptors. Hence E

This ability quickly to locate unseen prey suggests, according to the researchers, that the anteaters were using their electroreceptors to locate the nesting chambers.

Q4. The hypotheseis that needs to be strengthened is "anteaters use electroreceptors to detect electrical signals given off by prey"

researchers experimented anteaters in a weak electrical field and concluded that anteaters can detect weak electrical signals and hypothesized their theory that anteaters use electroreceptors to locate their prey. But according to the passage, researchers are still not sure of any electrical signals emanating from termite mounds. This points out a gap in their hyposthesis. option B fillls the gap.

let me know if any further questions.
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Re: Australian researchers have discovered electroreceptors [#permalink] New post 02 Oct 2012, 10:02
What is the ans to Question 2?
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Re: Australian researchers have discovered electroreceptors [#permalink] New post 02 Oct 2012, 20:57
anshunadir wrote:
Q3: Last line of the passage clearly suggests that the researchers are agreeing that anteaters located the chambers quickly because of electroreceptors. Hence E

This ability quickly to locate unseen prey suggests, according to the researchers, that the anteaters were using their electroreceptors to locate the nesting chambers.

Q4. The hypotheseis that needs to be strengthened is "anteaters use electroreceptors to detect electrical signals given off by prey"

researchers experimented anteaters in a weak electrical field and concluded that anteaters can detect weak electrical signals and hypothesized their theory that anteaters use electroreceptors to locate their prey. But according to the passage, researchers are still not sure of any electrical signals emanating from termite mounds. This points out a gap in their hyposthesis. option B fillls the gap.

let me know if any further questions.


Ya... What you said about 3 is absolutely correct. Then how come the answer is E? It should be A. Your reasoning suggests A more than E. Am I missing something? 4 is fine.



chigiwigi wrote:
What is the ans to Question 2?


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Re: Australian researchers have discovered electroreceptors [#permalink] New post 03 Oct 2012, 23:12
Quote:
Ya... What you said about 3 is absolutely correct. Then how come the answer is E? It should be A. Your reasoning suggests A more than E. Am I missing something? 4 is fine.


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 quickly to locate unseen prey suggests, according to the researchers, that the anteaters were using their electroreceptors to locate the nesting chambers.

I have divided the second para into three parts(using different colors)
Experiment in Red text already says that anteaters use electroreceptors to locate their prey. So if the question was about this experiment, option A would have been a better option. But the question talks about the experiment in blue text which only talks about how quickly anteaters were able to locate the prey colonies because of elecroreceptors.
Also, the last line of red text says anteaters use electroreceptors to detect electrical signals and the text in green says that researchers have been unable to detect any electrical signals emanating from prey colonies. This again holds against A which says conclusive evidence.

let me know if any further questions.
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Re: Australian researchers have discovered electroreceptors   [#permalink] 03 Oct 2012, 23:12
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