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# Australian researchers have discovered electroreceptors (sensory organ

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Re: Australian researchers have discovered electroreceptors [#permalink]

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09 Jul 2013, 11:05
1
shaileshmishra wrote:
my call:

D C A C A B

what about the penultimate question. Quite tricky, me too picked it wrong and said A
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Re: Australian researchers have discovered electroreceptors [#permalink]

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15 Jul 2013, 10:16
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]

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15 Jul 2013, 10:26
2
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]

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15 Jul 2013, 10:31
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.

(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:
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]

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19 Jul 2013, 03:38
101.d
102.c
103.a
104.c
105.c (never saw this coming!!)
106.B

Timing: 8:45secs
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Re: Australian researchers have discovered electroreceptors [#permalink]

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20 Aug 2013, 22:08
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]

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21 Aug 2013, 19:47
1
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]

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09 Sep 2013, 06:46
Can someone explain option 103, and 105 please?
I chose E and A respectively.
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Re: Australian researchers have discovered electroreceptors (sensory organ [#permalink]

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06 May 2016, 07:51
talismaaniac 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?

C

Can you please explain how C is the answer to question 2? Thanks.
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Re: Australian researchers have discovered electroreceptors (sensory organ [#permalink]

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02 Jan 2017, 08:37
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Re: Australian researchers have discovered electroreceptors (sensory organ [#permalink]

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Updated on: 21 Mar 2017, 22:40
sayantanc2k wrote:
lawiniecke wrote:
Can you please provide the answer to Q1 & Q2? Thahttps://gmatclub.com/forum/posting.p ... ingboxnks!!

Hi sayantanc2k,
Can you please provide an explanantion for Q2?
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Originally posted by nazgull on 20 Mar 2017, 21:53.
Last edited by nazgull on 21 Mar 2017, 22:40, edited 1 time in total.
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Australian researchers have discovered electroreceptors (sensory organ [#permalink]

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13 Oct 2017, 05:44
nazgulISB wrote:
sayantanc2k wrote:
lawiniecke wrote:
Can you please provide the answer to Q1 & Q2? Thahttps://gmatclub.com/forum/posting.p ... ingboxnks!!

Hi sayantanc2k,
Can you please provide an explanantion for Q2?

My two cents:
Which of the following can be inferred about the experiment described in the first paragraph? [ 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.

The likely options to get the reader confused :
(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.

Why is C the OA?
The finding of the little experiment is bold faced and is what we want to get our inference from. So from this sentence we know that electroreceptors are clustured at the tip of the snout, and hence, only this part responds to electrical fields. Which would mean some areas of the snout are not sensitive to a weal electrical stimulus.

Why is D not correct?
The ease with which or the affinity to strong electrical stimulus by tactile & electroreceptors has not been compared anywhere in the passage. Passage just talks about that tactile receptors getting excited to strong electrical stimulus. In fact, passage doesn't even mention, implicitly or explicitly, that electroreceptors get excited at all to strong electrical stimulus.

Hope this helps.
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Re: Australian researchers have discovered electroreceptors (sensory organ [#permalink]

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14 Oct 2017, 21:37
5/6 correct.
Took me 13 minutes.
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Re: Australian researchers have discovered electroreceptors (sensory organ [#permalink]

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24 May 2018, 01:24
Can someone please explain Q2 and Q5?
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Re: Australian researchers have discovered electroreceptors (sensory organ [#permalink]

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30 May 2018, 09:06
Hi jennpt, can you please provide an explanation for

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.Clearly wrong
(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. Clearly wrong
(C) Researchers found that some areas of the anteater’s snout were not sensitive to a weak electrical stimulus.How can we infer this?
(D) Researchers found that the anteater’s tactile receptors were more easily excited by a strong electrical stimulus than were the electroreceptors.Clearly wrong. This was not what the experiment was about
(E) Researchers tested small areas of the anteater’s snout in order to ensure that only electroreceptors were responding to the stimulus.I picked this even though I did not fully support it but I could not find a better answer.

4. 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.

Here I was stuck between C and D. What through me off if the word "Consistently" in C. This was a one time experiment but the choice says consistently. D made more sense to me because the ant eaters reacted to the weak stimuli more than to no stimuli.

As always, thank you!
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Australian researchers have discovered electroreceptors (sensory organ [#permalink]

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31 May 2018, 12:15
4
Hi oasis90,

This is a fun one. I like picturing these crazy sophisticated anteaters and their supercool nose technology.

For Q2, I'll be honest, I initially picked E too. However, the truth is we really don't know how or if they made sure that only electroreceptors were responding. But we can prove C by putting two and two together (typical GMAT inference structure):
*We know that tactile receptors don't respond to weak electrical charges
*We know that tactile receptors are on the animal's snout
Therefore, we know that there are some areas on the animal's snout (namely the tactile receptors) that don't respond to weak electrical charges. This is the super-safe answer we can prove.

For Q4, I didn't like "consistently" in C very much either. But this was the key finding from the study - that the anteaters could be trained in this way - so I wouldn't characterize it as a one-off event. The researchers must have been able to replicate that happening a few different times in order to make that conclusion. If the results of the training had been inconsistent, the researchers could not have said they "successfully trained an anteater".

But D goes too far. What do we know about strong vs. weak stimuli? At least when it comes to electrical charges, we know that anteaters use different receptors to detect strong stimuli than they do to detect weak stimuli. Really, that's all we know. I don't have any evidence to make a comparison about how readily (easily/quickly) they detect strong vs. weak. In your note, you mentioned weak stimuli vs. no stimuli, which isn't the same as strong vs. weak.

Hope that helps; let me know.

Best, Jennifer
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Re: Australian researchers have discovered electroreceptors (sensory organ [#permalink]

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31 May 2018, 13:46
jennpt wrote:
Hi oasis90,

This is a fun one. I like picturing these crazy sophisticated anteaters and their supercool nose technology.

For Q2, I'll be honest, I initially picked E too. However, the truth is we really don't know how or if they made sure that only electroreceptors were responding. But we can prove C by putting two and two together (typical GMAT inference structure):
*We know that tactile receptors don't respond to weak electrical charges
*We know that tactile receptors are on the animal's snout
Therefore, we know that there are some areas on the animal's snout (namely the tactile receptors) that don't respond to weak electrical charges. This is the super-safe answer we can prove.

For Q4, I didn't like "consistently" in C very much either. But this was the key finding from the study - that the anteaters could be trained in this way - so I wouldn't characterize it as a one-off event. The researchers must have been able to replicate that happening a few different times in order to make that conclusion. If the results of the training had been inconsistent, the researchers could not have said they "successfully trained an anteater".

But D goes too far. What do we know about strong vs. weak stimuli? At least when it comes to electrical charges, we know that anteaters use different receptors to detect strong stimuli than they do to detect weak stimuli. Really, that's all we know. I don't have any evidence to make a comparison about how readily (easily/quickly) they detect strong vs. weak. In your note, you mentioned weak stimuli vs. no stimuli, which isn't the same as strong vs. weak.

Hope that helps; let me know.

Best, Jennifer

Thanks Jennifer for the thorough explanation. This is kind of subtle. I thought about putting 2 and 2 together but maybe what threw me off is the word "Area". If the wording of the choice was "Some parts/receptors/mini-organs don't respond to weak stimuli" I would have selected it. When I saw area, I thought maybe tactile and electro receptors are both in the same vicinity so area is a generalization. Perhaps I am overthinking single words like I did with "consistently" below.

I think for Q4 I should have paid more attention to the word "readily" because, as you mentioned, there is no mention of that. and yes strong vs no is not the same as strong vs weak

Thanks again for your detailed explanation. I am reading many interesting and challenging OG passages and I will be reaching out with more questions.

Kind regards,

Oasis
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Re: Australian researchers have discovered electroreceptors (sensory organ   [#permalink] 31 May 2018, 13:46

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