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# A commercial insect trap consists of a small box containing

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A commercial insect trap consists of a small box containing [#permalink]

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23 Jun 2006, 19:16
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A commercial insect trap consists of a small box containing pesticide mixed with glucose, a sweet substance known to attract insect pests. Yet in households where this type of trap has been used regularly for the past several years, recently installed traps are far less effective in eliminating insect pests than were traps of that type installed several years ago. Research scientists have hypothesized that traps in those households decreased in effectiveness because successive generations of the pests developed a resistance to the pesticide in the traps.
Which one of the following, if true, most seriously undermines the hypothesis?
(A) In households where the traps have been used regularly, the proportion of insect pests that have a natural aversion to eating glucose has increased with each successive generation.
(B) Even when only a few individuals out an entire generation of insects survive the effects of a pesticide, the offspring of those individuals are usually resistant to that pesticide.
(C) After eating glucose mixed with the pesticide, insects that live in households that do not use the trap tend to die in greater numbers than do insects from households where the traps have been used regularly.
(D) After the manufacturer of the traps increased the concentration of the pesticide used in the traps, the traps were no more effective in eliminating household insect pests than were the original traps.
(E) The kind of glucose used to bait the traps is one of several different kinds of glucose that occur naturally.
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23 Jun 2006, 19:20
Straight A
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23 Jun 2006, 19:27
how about D? ...D states another reason for the deficiency of the trap --> the hypothesis may not be the cause.

Is it because this question asks for what undermines the hypothesis (instead of undermine the argument) that we can't choose D?

is it becoz of "natural aversion" that you chose A?!
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23 Jun 2006, 19:32
laxieqv wrote:
how about D? ...D states another reason for the deficiency of the trap --> the hypothesis may not be the cause.

Is it because this question asks for what undermines the hypothesis (instead of undermine the argument) that we can't choose D?

is it becoz of "natural aversion" that you chose A?!

did not choose D because D could be true if insects were immune to the pesticide. So it does not weaken.
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23 Jun 2006, 19:42
Btw, is the level of real GMAT questions higher or lower than the level of this question?!! Are the answer choices offered in real GMAT CRs straightforward and distinguishable?
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23 Jun 2006, 19:45
laxieqv wrote:
Btw, is the level of real GMAT questions higher or lower than the level of this question?!! Are the answer choices offered in real GMAT CRs straightforward and distinguishable?

I feel you can eliminate choices in LSAT CRs more easily, GMAT CR choices are more close and confusing at times. But there are not that many Gmat CRs available, so I guess the Lsat ones are good for practice.
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24 Jun 2006, 06:14
A. Same reason as discussed.
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24 Jun 2006, 09:43
Thanks GMATMBA for explaination.
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24 Jun 2006, 10:37
yepp, A
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24 Jun 2006, 11:13
A it is
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24 Jun 2006, 20:10
A for me - to weaken an assumption find something else that may have contributed to the state of affairs...
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27 Jun 2006, 02:35
Will go with D.

Only D gives an alternate solution to the ineffectiveness of the traps in present times.
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10 Jul 2006, 09:08
laxieqv wrote:
A commercial insect trap consists of a small box containing pesticide mixed with glucose, a sweet substance known to attract insect pests. Yet in households where this type of trap has been used regularly for the past several years, recently installed traps are far less effective in eliminating insect pests than were traps of that type installed several years ago. Research scientists have hypothesized that traps in those households decreased in effectiveness because successive generations of the pests developed a resistance to the pesticide in the traps.
Which one of the following, if true, most seriously undermines the hypothesis?
(A) In households where the traps have been used regularly, the proportion of insect pests that have a natural aversion to eating glucose has increased with each successive generation.
(B) Even when only a few individuals out an entire generation of insects survive the effects of a pesticide, the offspring of those individuals are usually resistant to that pesticide.
(C) After eating glucose mixed with the pesticide, insects that live in households that do not use the trap tend to die in greater numbers than do insects from households where the traps have been used regularly.
(D) After the manufacturer of the traps increased the concentration of the pesticide used in the traps, the traps were no more effective in eliminating household insect pests than were the original traps.
(E) The kind of glucose used to bait the traps is one of several different kinds of glucose that occur naturally.

Dont you think in A says reiterates whatever the argument is saying, i.e. successive generations of these pests have infact developed a resistance to this glucose and pesticide mixture. Had the same be said about insects in households which did not use this mixture, then A would have been appropriate.

D clearly gives us another reason why the proportion of pests increased.
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10 Jul 2006, 10:30
I'm with A.

D is bad because it basically restates what the passage said. The passage says that the new traps are far less effective than the older traps. This implies that the new traps are not any better than the older traps. D says exactly this.

A is good because it gives us another reason why the new traps are ineffective. The passage says that scientists say the new traps are ineffective because of a resistance to the pesticicide. Then A comes in and says, "wait, it's not the resistance to the pesticide that's making the new traps ineffective, it's that the new generation of insects don't like the glucose solution".
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10 Jul 2006, 11:04
(A) In households where the traps have been used regularly, the proportion of insect pests that have a natural aversion to eating glucose has increased with each successive generation.

Definate A for me.

Aversion to eating glucose may cause a drop in the effectiveness of the trap. This weakens the hypothesis that the pesticide is no longer effective.
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10 Jul 2006, 12:55
I will go with A

The effectiveness decreased at households using the traps where the non-glucose eating insects increased.

It may not beat the professor's theory but it certainly undermines their theory that "successive generations develop immunity to pesticide WHICH has led to reduced effectiveness".

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10 Jul 2006, 22:41
A makes sense...D deviates a little
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12 Jul 2006, 03:03
laxieqv wrote:
A commercial insect trap consists of a small box containing pesticide mixed with glucose, a sweet substance known to attract insect pests. Yet in households where this type of trap has been used regularly for the past several years, recently installed traps are far less effective in eliminating insect pests than were traps of that type installed several years ago. Research scientists have hypothesized that traps in those households decreased in effectiveness because successive generations of the pests developed a resistance to the pesticide in the traps.
Which one of the following, if true, most seriously undermines the hypothesis?
(A) In households where the traps have been used regularly, the proportion of insect pests that have a natural aversion to eating glucose has increased with each successive generation.
(B) Even when only a few individuals out an entire generation of insects survive the effects of a pesticide, the offspring of those individuals are usually resistant to that pesticide.
(C) After eating glucose mixed with the pesticide, insects that live in households that do not use the trap tend to die in greater numbers than do insects from households where the traps have been used regularly.
(D) After the manufacturer of the traps increased the concentration of the pesticide used in the traps, the traps were no more effective in eliminating household insect pests than were the original traps.
(E) The kind of glucose used to bait the traps is one of several different kinds of glucose that occur naturally.

OA please.. I think A. it says "natural aversion" not developed aversion. So A is better.
D is wrong because: Either pesticide kills the insects or doesn't kill the insects.. So increased concentration doesn't mean increased effectiveness, meaning the result could be same with lower concetration..

anyone agrees ?
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12 Jul 2006, 06:28
Late, but (A). The added glucose shows another reason for the decreased effectiveness. Its not that the insects are developing a resistance to the pesticide, they just arent eating it at all.
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12 Jul 2006, 06:41
(A) In households where the traps have been used regularly, the proportion of insect pests that have a natural aversion to eating glucose has increased with each successive generation.
ok: resistance to pesticide is not the cause. The aversion to glucose is the one=> hypothesis false

(B) Even when only a few individuals out an entire generation of insects survive the effects of a pesticide, the offspring of those individuals are usually resistant to that pesticide.
out .support argument

(C) After eating glucose mixed with the pesticide, insects that live in households that do not use the trap tend to die in greater numbers than do insects from households where the traps have been used regularly.
out. support argument

(D) After the manufacturer of the traps increased the concentration of the pesticide used in the traps, the traps were no more effective in eliminating household insect pests than were the original traps.
out, support argument. more pesticide leads to greater resistance.

(E) The kind of glucose used to bait the traps is one of several different kinds of glucose that occur naturally.
out of scope, out.
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