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Insects can see ultraviolet light and are known to identify important

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Insects can see ultraviolet light and are known to identify important  [#permalink]

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New post Updated on: 22 Feb 2019, 02:18
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Insects can see ultraviolet light and are known to identify important food sources and mating sites by sensing the characteristic patterns of ultraviolet light that these things reflect. Insects are also attracted to Glomosus spiderwebs, which reflect ultraviolet light. Thus, insects are probably attracted to these webs because of the specific patterns of ultraviolet light that these webs reflect.

Which one of the following, if true, most strongly supports the argument?


(A) When webs of many different species of spider were illuminated with a uniform source of white light containing an ultraviolet component, many of these webs did not reflect the ultraviolet light.

(B) When the silks of spiders that spin silk only for lining burrows and covering eggs were illuminated with white light containing an ultraviolet component, the silks of these spiders reflected ultraviolet light.

(C) When webs of the comparatively recently evolved common garden spider were illuminated with white light containing an ultraviolet component, only certain portions of these webs reflected ultraviolet light.

(D) When Drosophila fruit flies were placed before a Glomosus web and a synthetic web of similar pattern that also reflected ultraviolet light and both webs were illuminated with white light containing an ultraviolet component, many of the fruit flies flew to the Glomosus web.

(E) When Drosophila fruit flies were placed before two Glomosus webs, one illuminated with white light containing an ultraviolet component and one illuminated with white light without an ultraviolet component, the majority flew to the ultraviolet reflecting web.

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Originally posted by LordStark on 22 Feb 2019, 01:22.
Last edited by Bunuel on 22 Feb 2019, 02:18, edited 1 time in total.
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Re: Insects can see ultraviolet light and are known to identify important  [#permalink]

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New post 23 Feb 2019, 03:26
PeepalTree wrote:
Insects can see ultraviolet light and are known to identify important food sources and mating sites by sensing the characteristic patterns of ultraviolet light that these things reflect. Insects are also attracted to Glomosus spiderwebs, which reflect ultraviolet light. Thus, insects are probably attracted to these webs because of the specific patterns of ultraviolet light that these webs reflect.

Which one of the following, if true, most strongly supports the argument?


(A) When webs of many different species of spider were illuminated with a uniform source of white light containing an ultraviolet component, many of these webs did not reflect the ultraviolet light.

(B) When the silks of spiders that spin silk only for lining burrows and covering eggs were illuminated with white light containing an ultraviolet component, the silks of these spiders reflected ultraviolet light.

(C) When webs of the comparatively recently evolved common garden spider were illuminated with white light containing an ultraviolet component, only certain portions of these webs reflected ultraviolet light.

(D) When Drosophila fruit flies were placed before a Glomosus web and a synthetic web of similar pattern that also reflected ultraviolet light and both webs were illuminated with white light containing an ultraviolet component, many of the fruit flies flew to the Glomosus web.

(E) When Drosophila fruit flies were placed before two Glomosus webs, one illuminated with white light containing an ultraviolet component and one illuminated with white light without an ultraviolet component, the majority flew to the ultraviolet reflecting web.


Why is D not correct?

D tells us that these webs emit a specific pattern of ultraviolet light which enables the fruit flies to distinguish between real and synthetic webs.
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Re: Insects can see ultraviolet light and are known to identify important  [#permalink]

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New post 23 Feb 2019, 04:00
eabhgoy wrote:
PeepalTree wrote:
Insects can see ultraviolet light and are known to identify important food sources and mating sites by sensing the characteristic patterns of ultraviolet light that these things reflect. Insects are also attracted to Glomosus spiderwebs, which reflect ultraviolet light. Thus, insects are probably attracted to these webs because of the specific patterns of ultraviolet light that these webs reflect.

Which one of the following, if true, most strongly supports the argument?


(A) When webs of many different species of spider were illuminated with a uniform source of white light containing an ultraviolet component, many of these webs did not reflect the ultraviolet light.

(B) When the silks of spiders that spin silk only for lining burrows and covering eggs were illuminated with white light containing an ultraviolet component, the silks of these spiders reflected ultraviolet light.

(C) When webs of the comparatively recently evolved common garden spider were illuminated with white light containing an ultraviolet component, only certain portions of these webs reflected ultraviolet light.

(D) When Drosophila fruit flies were placed before a Glomosus web and a synthetic web of similar pattern that also reflected ultraviolet light and both webs were illuminated with white light containing an ultraviolet component, many of the fruit flies flew to the Glomosus web.

(E) When Drosophila fruit flies were placed before two Glomosus webs, one illuminated with white light containing an ultraviolet component and one illuminated with white light without an ultraviolet component, the majority flew to the ultraviolet reflecting web.


Why is D not correct?

D tells us that these webs emit a specific pattern of ultraviolet light which enables the fruit flies to distinguish between real and synthetic webs.



Hi ,


My two cents


Here the Conclusion just talks about the Web Glomosus and UV reflection pattern. Not the Pattern of Web itself .
In D , the two webs are of similar pattern ( may be the design is similar ) but not the UV reflection pattern

So D is incorrect .

E is the only option left .

hope this helps .
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Re: Insects can see ultraviolet light and are known to identify important  [#permalink]

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New post 23 Feb 2019, 04:18
kumarankit01 wrote:
eabhgoy wrote:
PeepalTree wrote:
Insects can see ultraviolet light and are known to identify important food sources and mating sites by sensing the characteristic patterns of ultraviolet light that these things reflect. Insects are also attracted to Glomosus spiderwebs, which reflect ultraviolet light. Thus, insects are probably attracted to these webs because of the specific patterns of ultraviolet light that these webs reflect.

Which one of the following, if true, most strongly supports the argument?


(A) When webs of many different species of spider were illuminated with a uniform source of white light containing an ultraviolet component, many of these webs did not reflect the ultraviolet light.

(B) When the silks of spiders that spin silk only for lining burrows and covering eggs were illuminated with white light containing an ultraviolet component, the silks of these spiders reflected ultraviolet light.

(C) When webs of the comparatively recently evolved common garden spider were illuminated with white light containing an ultraviolet component, only certain portions of these webs reflected ultraviolet light.

(D) When Drosophila fruit flies were placed before a Glomosus web and a synthetic web of similar pattern that also reflected ultraviolet light and both webs were illuminated with white light containing an ultraviolet component, many of the fruit flies flew to the Glomosus web.

(E) When Drosophila fruit flies were placed before two Glomosus webs, one illuminated with white light containing an ultraviolet component and one illuminated with white light without an ultraviolet component, the majority flew to the ultraviolet reflecting web.


Why is D not correct?

D tells us that these webs emit a specific pattern of ultraviolet light which enables the fruit flies to distinguish between real and synthetic webs.



Hi ,


My two cents


Here the Conclusion just talks about the Web Glomosus and UV reflection pattern. Not the Pattern of Web itself .
In D , the two webs are of similar pattern ( may be the design is similar ) but not the UV reflection pattern

So D is incorrect .

E is the only option left .

hope this helps .


Yes sir, i am also referring to the pattern of the ultraviolet rays emitted by the real web vs synthetic web. Since the flies are able to differentiate between the two, this strengthens the argument.

Am I missing something?

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Re: Insects can see ultraviolet light and are known to identify important  [#permalink]

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New post 23 Feb 2019, 19:04
Hi,

I am not an expert but a learner. Still, I would explain my reasoning. In fact, Option “D” weakens the argument. We need to strengthen the argument by showing that it’s the UV light pattern that attracts insects whereas in “D” though both the webs reflect UV light but insects are attracted to only one web which means the reason for the attraction is not UV light but something else. This weakens the argument.

Hope this helps. Thanks!

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Re: Insects can see ultraviolet light and are known to identify important  [#permalink]

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New post 08 Apr 2019, 10:52
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Quote:
Insects can see ultraviolet light and are known to identify important food sources and mating sites by sensing the characteristic patterns of ultraviolet light that these things reflect. Insects are also attracted to Glomosus spiderwebs, which reflect ultraviolet light. Thus, insects are probably attracted to these webs because of the specific patterns of ultraviolet light that these webs reflect.


Conclusion: Insects are attracted to Glomosus webs because of the specific patterns of ultraviolet light that these webs reflect.
We have to find a statement that strengthens the reason that Insects are indeed attracted to the web because of reflection of UV light.

Which one of the following, if true, most strongly supports the argument?

Quote:
(A) When webs of many different species of spider were illuminated with a uniform source of white light containing an ultraviolet component, many of these webs did not reflect the ultraviolet light.

The topic of discussion is Glomosus spider. Information about many different species of spider does not tell us anything about whether the Insects are attracted to Glomosus spider web because of UV rays.

Quote:
(B) When the silks of spiders that spin silk only for lining burrows and covering eggs were illuminated with white light containing an ultraviolet component, the silks of these spiders reflected ultraviolet light.

We are interested in the web of Glomosus spider. Not the silks of spiders.

Quote:
(C) When webs of the comparatively recently evolved common garden spider were illuminated with white light containing an ultraviolet component, only certain portions of these webs reflected ultraviolet light.

We are interested in the web of Glomosus spider. Not garden spider.


Quote:
(D) When Drosophila fruit flies were placed before a Glomosus web and a synthetic web of similar pattern that also reflected ultraviolet light and both webs were illuminated with white light containing an ultraviolet component, many of the fruit flies flew to the Glomosus web.

Glomosus web and Synthetic web reflect similar pattern of UV lights. So fruit flies should be equally attracted to both the webs. Yet the fact that many of the fruit flies flew to Glomosus web but not the synthetic web gives us a reason to suspect that the fruit flies are drawn to Glomosus web because of some other factor but not because of uv rays reflection patterns.So, this could be a potential weakner.

Quote:
(E) When Drosophila fruit flies were placed before two Glomosus webs, one illuminated with white light containing an ultraviolet component and one illuminated with white light without an ultraviolet component, the majority flew to the ultraviolet reflecting web.

This option strengthens the fact that fruit flies are attracted to Glomosus web because of ultraviolet reflecting web.
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Re: Insects can see ultraviolet light and are known to identify important  [#permalink]

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New post 14 Aug 2019, 15:30
D weakens the argument because the synthetic web is similar in every way to the Glomosus web. It also emits the same patterns so the flies can't differentiate between the 2 patterns. The conclusion states that its because of the patterns the flies flock to the Glomosus web but D shows that since the patterns for the synthetic and the Glomosus webs are the same,the flies gravitate towards the Glomosus for a different reason in strengthening causal reasoning we need to prove the cause the conclusion or argument states not deny it. E does that
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Re: Insects can see ultraviolet light and are known to identify important   [#permalink] 14 Aug 2019, 15:30
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