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Another example:
Why is it not a good method to get rid of terrorists in Iraq by dropping a nuclear bomb?
Correct answer: because you are going to kill all the innocent people in Iraq too.
Incorrect answer: because you are not going to be able to kill the terrorists in Korea.
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I was going for B, but after reading honghu's explanation 3 or 4 times, she got me convinced..
so I will also pick C.
does anyone know what is the OA?
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Hello HongHu,
Thanks very much for your kind explanations below. I now fully understand what the sentences are meaning and question asking. It was bit difficult for me to grasp the meaning of sentences of this question... Thank you.
HongHu wrote: It basically says when catapillars grow up to a certain size, its body will generate certain enzyme that make it stop feeding itself before it makes the little house for itself (then it will become a butterfly). So if we can make the same enzyme and spread it to a young catapillar then it will stop feeding itself, but it's not ready to become a butterfly yet. Instead it will die.
Question asks why it is not good to use this method to kill the agriculture pest that go through the catapillar phases. Well I believe that is because other good insects may also be killed by this method, which is not good.
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To All,
Good discussions! The OA is C.
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HongHu wrote: ywilfred wrote: I think the key word here is 'advisable'. If i changed it to 'why it is not useful to use the enzyme to kill agricultural pests', then B would be the answer. Is that right ?  No. B is wrong because it is totally out of scope. The question asks about pests that go through the catapillar phase. B talks about pests that don't go through the catapillar phase. An example: If I pour the dirty water on this bucket out we'll have a cleaner bucket. Correct objection: But you'll also pour out the baby in the bucket! Incorrect objection: But you still have a nonclean bathtub! I would say 'B' is wrong because of the word advisable. B's meaning would be it's not useful to spray enzymes, rather than it's ill-adivsed to do so. C is correct because it's a bad move to do so since the enzyme are killing other insects that might be beneficial to your crops.
All in all, I agree with your stand on why C is correct.
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ywilfred wrote: I would say 'B' is wrong because of the word advisable. B's meaning would be it's not useful to spray enzymes, rather than it's ill-adivsed to do so.
Hmmm why would you say that it's not useful to spray enzymes? It will kill all agricuture pests that go through the catapillar will it not? I'd say that it IS very useful. (Although still not good.)
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HongHu wrote: ywilfred wrote: I would say 'B' is wrong because of the word advisable. B's meaning would be it's not useful to spray enzymes, rather than it's ill-adivsed to do so. Hmmm why would you say that it's not useful to spray enzymes? It will kill all agricuture pests that go through the catapillar will it not? I'd say that it IS very useful. (Although still not good.) Yes it is C.....
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I pick C
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gmat2me2 wrote: HongHu wrote: ywilfred wrote: I would say 'B' is wrong because of the word advisable. B's meaning would be it's not useful to spray enzymes, rather than it's ill-adivsed to do so. Hmmm why would you say that it's not useful to spray enzymes? It will kill all agricuture pests that go through the catapillar will it not? I'd say that it IS very useful. (Although still not good.) Yes it is C..... I said it's not useful because in (B), it says most agricultural pests do not go through a caterpillar stage. If this is the case, then most agricultural pests will still be eating away at your crops. Thus spraying the enzymes is not useful.
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Sounds like you still didn't get what I was trying to say. The question didn't ask whether the method is useful to kill all agriculture pests. It asks whether the method is useful to kill agriculture pests that go through the catapillor stages.
B is like if I ask whether it is a good method to fend away attacks of bombs and you answer a lot of times they would attack us using poisons and this method is not good because it can't fend away poisons.
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Caterpillars of all species produce an identical hormone called “juvenile hormone” that maintains feeding behavior. Only when a caterpillar has grown to the right size for pupation to take place does a special enzyme halt the production of juvenile hormone. This enzyme can be synthesized and will, on being ingested by immature caterpillars, kill them by stopping them from feeding. Which of the following, if true, most strongly supports the view that it would not be advisable to try to eradicate agricultural pests that go through a caterpillar stage by spraying croplands with the enzyme mentioned above? (A) Most species of caterpillar are subject to some natural predation. (B) Many agricultural pests do not go through a caterpillar stage. (C) Many agriculturally beneficial insects go through a caterpillar stage. (D) Since caterpillars of different species emerge at different times, several sprayings would be necessary. (E) Although the enzyme has been synthesized in the laboratory, no large-scale production facilities exist as yet.
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IMO C
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mrik wrote: IMO C May I ask why?
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noboru wrote: mrik wrote: IMO C May I ask why? The paragraph goes on explaining that the enzyme when produced, halts the production of “juvenile hormone”, which maintains feeding behavior in caterpillars. So if the enzyme is produced synthetically and used as insecticides then it will be useful in eradicating caterpillars. Only C supports the fact that if there are other agriculturally beneficial insects that go through a caterpillar stage then they may also get eradicated when the enzyme is administered. Please give kudos if i have helped you in understanding 
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I would also go with C
The argument says that the synthesized enzyme will kill young caterpillars to protect crops. but in the question, we are asked to choose the option saying that we should not protect crops by this mean.
(C) tells us that is we try to protect crops by this mean, we will also kill some insects that are beneficial to agriculture.
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It's C.
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C for me.
Caterpillars of all species produce a hormone, “juvenile hormone”, that maintains feeding behavior. When caterpillar grows to right size a special enzyme stops the production of that hormone (which maintains feeding bhevior). However if this enzyme is ingested in immature caterpillars it would kill them by stopping them from feeding.
Why it would not be advisable to kill agricultural pests that go through a caterpillar stage by spraying crops with enzymes
surely, it would not be advisable to kill agricultural pests if those pests are of some benefit to the farmers or in their agriculture business. Then there could be no reason to kill them.
Option C says exactly that.
(C) Many agriculturally beneficial insects go through a caterpillar stage.
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700 plus level question [#permalink]
 08 Jun 2011, 11:59
Caterpillars of all species produce an identical hormone called "juvenile hormone" that maintains feeding
behavior. Only when a caterpillar has grown to the right size for pupation to take place does a special enzyme halt the production of juvenile hormone. This enzyme can be synthesized and will, on being ingested by immature caterpillars, kill them by stopping them from feeding.
Which of the following, if true, most strongly supports the view that it would not be advisable to try to
eradicate agricultural pests that go through a caterpillar stage by spraying croplands with the enzyme
mentioned above?
(A) Most species of caterpillar are subject to some natural predation.
(B) Many agricultural pests do not go through a caterpillar stage.
(C) Many agriculturally beneficial insects go through a caterpillar stage.
(D) Since caterpillars of different species emerge at different times, several sprayings would be necessary.
(E) Although the enzyme has been synthesized in the laboratory, no large-scale production facilities exist as
yet.
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Re: Caterpillars of all species produce an identical hormone [#permalink]
24 Mar 2013, 10:41
The answer should be, in my opinion, C. What is the OA?
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Re: Caterpillars of all species produce an identical hormone
[#permalink]
24 Mar 2013, 10:41
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