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A certain type of insect trap uses a scented lure to attract

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A certain type of insect trap uses a scented lure to attract [#permalink] New post 27 Jan 2013, 14:36
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A certain type of insect trap uses a scented lure to attract rose beetles into a plastic bag from which it is difficult for them to escape. If several of these traps are installed in a backyard garden, the number of rose beetles in the garden will be greatly reduced. If only one trap is installed, however, the number of rose beetles in the garden will actually increase.

Which one of the following, if true, most helps to resolve the apparent discrepancy?

(A) The scent of a single trap’s lure usually cannot be detected throughout a backyard garden by rose beetles.
(B) Several traps are better able to catch a large number of rose beetles than is one trap alone, since any rose beetles that evade one trap are likely to encounter another trap if there are several traps in the garden.
(C) When there are several traps in a garden, they each capture fewer rose beetles than any single trap would if it were the only trap in the garden.
(D) The presence of any traps in a backyard garden will attract more rose beetles than one trap can catch, but several traps will not attract significantly more rose beetles to a garden than one trap will.
(E) When there is only one trap in the garden, the plastic bag quickly becomes filled to capacity, allowing some rose beetles to escape.
[Reveal] Spoiler: OA

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Re: A certain type of insect trap uses a scented lure to attract [#permalink] New post 16 Aug 2013, 01:56
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smallurgo wrote:
I don't know why D is the OA. Help me


this is a paradox situation.
there will be 2 situation which will be contradicting.
now when you resolve the paradox ..you always make sure that both cases are considered...means you have to show a situation where both contradicting situation can occur
.

now lets see this question:
let say several traps = 10 in number.
argument says:
if you use 10 traps ==>population of beetles will decrease.==>case A
if you use only 1 trap ==>population will actually increase....==>CASE B

now after reading this you must be saying that what the heck....since TRAP either 1 or more will somehow catch beetles and hence population should decrease ...why there is population increase....ok
ok now lets wear a thinking hat...how can population may increase here...:
population will increase only if either beetles give birth to new ones ...or other beetles are coming from outside.==.
now you will think that why this increase is only when we use only one trap and not when 10 traps are used...==>it means presence of 1 trap might urge beetles to give birth or might attract other beetles from outside.


now with this 2 situation in mind lets proceed to answer choice.:

A) The scent of a single trap’s lure usually cannot be detected throughout a backyard garden by rose beetles.
According to this single trap scent is less so rose beetles cant detect ==>so this is why there is population decrese only when 10 traps are used==>but thi clears only one case ..case A...WHAT ABOUT CASE B?.....how the population is increasing in case of single trap...so this is not resolving hence WRONG.

(B) Several traps are better able to catch a large number of rose beetles than is one trap alone, since any rose beetles that evade one trap are likely to encounter another trap if there are several traps in the garden.
now we dont want to know about other traps...so this is simply out of scope. WRONG.

(C) When there are several traps in a garden, they each capture fewer rose beetles than any single trap would if it were the only trap in the garden.
Clearly this ones also doesnt talk about how the population increases when you use only one trap...hence WRONG.

(D) The presence of any traps in a backyard garden will attract more rose beetles than one trap can catch, but several traps will not attract significantly more rose beetles to a garden than one trap will.
bingo....THIS IS WHAT WE THOUGHT...correct.

(E) When there is only one trap in the garden, the plastic bag quickly becomes filled to capacity, allowing some rose beetles to escape.
whether it catches some or more population should decrease and not increase so this also not ressolving the paradox.WRONG.

hence D

hope it helps
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Re: A certain type of insect trap uses a scented lure [#permalink] New post 29 Jan 2013, 06:49
Legendaddy wrote:
A certain type of insect trap uses a scented lure to attract rose beetles into a plastic bag from which it is difficult for them to escape. If several of these traps are installed in a backyard garden, the number of rose beetles in the garden will be greatly reduced. If only one trap is installed, however, the number of rose beetles in the garden will actually increase.

Which one of the following, if true, most helps to resolve the apparent discrepancy?

(A) The scent of a single trap’s lure usually cannot be detected throughout a backyard garden by rose beetles.
(B) Several traps are better able to catch a large number of rose beetles than is one trap alone, since any rose beetles that evade one trap are likely to encounter another trap if there are several traps in the garden.
(C) When there are several traps in a garden, they each capture fewer rose beetles than any single trap would if it were the only trap in the garden.
(D) The presence of any traps in a backyard garden will attract more rose beetles than one trap can catch, but several traps will not attract significantly more rose beetles to a garden than one trap will.
(E) When there is only one trap in the garden, the plastic bag quickly becomes filled to capacity, allowing some rose beetles to escape.


(A) OUT OF SCOPE
(B) doesn't explain why if only one trap is installed, the number of rose beetles increases.
(C) is WRONG because it states the opposite of what been said in the stem
(D) CORRECT because if several traps will not attract significantly more rose beetles to a garden than one trap will, the number of rose beetles in the garden will be greatly reduced while if only one trap is installed, however, the number of rose beetles in the garden will actually increase.
(E) explains why the number of rose beetles is reducing but doesn't explain why the number of rose beetles is increasing if it were only one trap in the garden.
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Re: A certain type of insect trap uses a scented lure to attract [#permalink] New post 16 Aug 2013, 00:46
I don't know why D is the OA. Help me
Re: A certain type of insect trap uses a scented lure to attract   [#permalink] 16 Aug 2013, 00:46
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