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Although an insecticide may initially prove effective in

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Re: Although an insecticide may initially prove effective [#permalink] New post 26 Nov 2012, 01:51
Archit143 wrote:
I seriously doubt the OA reason since B states that old mosquitoes have completed their breeding cycle that means they wont breed anymore and they have passed on their resistance. Either the option is out of scope or an interpretation.


I see where you're going with this - I guess from my perspective, the difference is when the older mosquitos become resistant to the pesticide. My interpretation was that it is only after coming into contact with the said pesticides that the resistance is contracted. Therefore, if the mosquitos don't come into contact with the pesticides until they are of the age to be 'targeted' by this new spraying scheme, then any procreation that took place prior to being targeted would not pass down the resistance as they are not yet resistant themselves.

This was the reason why I chose 'B', but I do see where there could be confusion between answers E & B - it all depends if the mosquitos are resistant prior to being targeted or not, which the passage is not entirely clear about.
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Re: Although an insecticide may initially prove effective [#permalink] New post 26 Nov 2012, 02:55
Vineetk wrote:
gmatbull wrote:
@ Vineetk,

For B, yes, that's precisely how I feel it should have been worded.

E: older mosquitoes are LESS susceptible to insecticide THAN the younger ones. The older ones are more difficult to
kill with the insecticide.

If Older ones transfer immunity genes to younger ones, and are more difficult to eliminate, then any such plan that
will eliminate the older ones will assure the researchers that malaria will be curtailed.

This is my opinion....


There are 2 objectives to meet in the argument:

1. Lifecycle should continue.
2. Killing only old mosquito.

Option B meets both the objective in which the lifecycle of mosquito can continue and killing of old mosquito can happen.
Option E does not meet the second objective.


Can u mention excerpts from the argument that says that Lifecycle shoul continue.

If u are cosidering the highlighted part mentioned below than its wrong.
Because the presence of older mosquitoes—those ten or more days old—is essential to maintaining the life cycle of the malaria parasite,
The argument is concerned with killing the older mosquitoes especially the ones which are more than 10 weeks old because they help in thriving the life cycle.
I request gmatbull to post the OE
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Re: Although an insecticide may initially prove effective [#permalink] New post 28 Nov 2012, 19:24
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gmatbull wrote:
Although an insecticide may initially prove effective in reducing malaria-causing mosquito populations, the surviving
mosquitoes, genetically endowed to withstand the insecticide, thrive on the reduced competition from other
mosquitoes and pass on their genetically based resistance to their offspring. Mosquito populations then become
less and less susceptible to the insecticides. Because the presence of older mosquitoes—those ten or more days
old—is essential to maintaining the life cycle of the malaria parasite, researchers have proposed addressing the
problem of pesticide resistance by searching for a means of targeting only older mosquitoes for elimination.

Which of the following, if true, would most help support the researchers’ proposal?

A. Younger mosquitoes are also essential to the life cycle of the malaria parasite.
B. The older mosquitoes have completed their breeding activity.
C. The proposed approach to controlling mosquito populations is likely to require more frequent applications of pesticides.
D. Malaria is only transmitted to humans by mosquito bites.
E. The older mosquitoes are not as susceptible to insecticides as younger mosquitoes.

Pls provide explanations... OA
[Reveal] Spoiler:
after deliberations


Responding to a pm:

Definitely a tough one.

The problem is that you need to read the stimulus at least twice just to understand it. The scene is something like this:

Say there are lots of mosquitoes and you spray insecticide to control malaria. Now what happens when quite a few mosquitoes die? The leftover ones are immune to insecticide and have little competition so they breed uncontrollably. Next time when you spray, the mosquito population doesn't get affected since they are mostly immune.
The solution proposed is this: Older mosquitoes are essential to maintaining the life cycle of the malaria parasite. Target only them instead of the entire mosquito population. There is still competition but an essential part of maintaining the life cycle of malaria parasites is missing.

(B) strengthens the 'there is still competition' part of the argument. If older mosquitoes have already bred, this will ensure a thriving mosquito population which means enough competition so that the insecticide immune mosquitoes do not take over.
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Re: Although an insecticide may initially prove effective in [#permalink] New post 08 Apr 2013, 09:13
Expert's post
gmatbull wrote:
Although an insecticide may initially prove effective in reducing malaria-causing mosquito populations, the surviving mosquitoes, genetically endowed to withstand the insecticide, thrive on the reduced competition from other mosquitoes and pass on their genetically based resistance to their offspring. Mosquito populations then become less and less susceptible to the insecticides. Because the presence of older mosquitoes—those ten or more days old—is essential to maintaining the life cycle of the malaria parasite, researchers have proposed addressing the problem of pesticide resistance by searching for a means of targeting only older mosquitoes for elimination.

Which of the following, if true, would most help support the researchers’ proposal?

A. Younger mosquitoes are also essential to the life cycle of the malaria parasite.
B. The older mosquitoes have completed their breeding activity.
C. The proposed approach to controlling mosquito populations is likely to require more frequent applications of pesticides.
D. Malaria is only transmitted to humans by mosquito bites.
E. The older mosquitoes are not as susceptible to insecticides as younger mosquitoes.

Quote:
Hi Mike, I am not able to understand how come option B strengthens the argument. As per me option E strengthens the argument. Can you kindly explain where am i making a mistake, if any. Waiting eagerly for your valuable inputs. Regards, Fame

Fame,
I would say you are confused because this is a poorly written question. In a good GMAT CR question, it may be confusing when thinking it through, but when the OA & OE are revealed, everyone has an "aha!" and feels that it makes sense.

I tend to agree with VeritasPrepKarishma's excellent analysis above. In her view, the scientists want to kill mosquitoes but leave the inter-mosquito competition intact. If they kill the older mosquitoes, this will have the advantage of killing mosquitoes that are "essential to maintaining the life cycle of the malaria parasite" without reducing genetic competition in the mosquito population. Among other things, the question expect the non-scientist reader to know that, by the "malaria parasite", they mean the protist that cause malaria, i.e. that malaria is carried by a parasite that lives in the mosquito. I think the question demands a bit too much outside knowledge of science --- I don't think the GMAT would automatically expect the reader to know the details of how genetic competition plays out or the details of how malaria is carried or transmitted. I think it's very very easy to write a hard CR question if it involves specialized knowledge of some scientific field, knowledge that maybe folks learned at one time in high school but is not uppermost in their minds. I think it's much harder to write a CR question that treats everyday topics that are well-known to everyone, that is puzzling to many readers on first reading, but that makes complete sense to everyone once the OE is given. The GMAT does this consistently with its CR question. This particular question falls well short of that standard.

That's my 2¢

Mike :-)
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Re: Although an insecticide may initially prove effective in [#permalink] New post 13 Apr 2013, 00:18
Although I picked 'E', I am not fully convinced with any of the answer options. Can an expert please explain ?
Re: Although an insecticide may initially prove effective in   [#permalink] 13 Apr 2013, 00:18
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