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23 Nov 2012, 13:56
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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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.
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.
24 Nov 2012, 05:29
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gmatbull
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
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
after deliberations
IMO E
I just have doubt on B...
Is this weakener/strengthener ???
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24 Nov 2012, 06:39
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"presence of older mosquitoes—those ten or more days old—is essential to maintaining the life cycle of the malaria parasite"-------- part of the premise. we have to strengthen the fact that:-
researchers have proposed addressing the problem of pesticide resistance by searching for a means of targeting only older mosquitoes for elimination.
Lets scan the options contenders B and E,
option B states that "B. The older mosquitoes have completed their breeding activity.".......If they have completed their breeding cycle, then there is no use of targeting old mosquitoes.
E. The older mosquitoes are not as susceptible to insecticides as younger mosquitoes.--------Though this is a repetition of the premise but there is no other option close to it.
If the old mosquitoes are not susceptible to insecticide than they need to be targeted for elimination and it is already stated in the premise that these older mosquitoes are needed to thrive the life cycle.
Hence i feel that E is the best option which strengthens and B is somewhat weakening the argument.
researchers have proposed addressing the problem of pesticide resistance by searching for a means of targeting only older mosquitoes for elimination.
Lets scan the options contenders B and E,
option B states that "B. The older mosquitoes have completed their breeding activity.".......If they have completed their breeding cycle, then there is no use of targeting old mosquitoes.
E. The older mosquitoes are not as susceptible to insecticides as younger mosquitoes.--------Though this is a repetition of the premise but there is no other option close to it.
If the old mosquitoes are not susceptible to insecticide than they need to be targeted for elimination and it is already stated in the premise that these older mosquitoes are needed to thrive the life cycle.
Hence i feel that E is the best option which strengthens and B is somewhat weakening the argument.
