Caterpillars of all species produce an identical hormone : GMAT Critical Reasoning (CR)
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# Caterpillars of all species produce an identical hormone

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Caterpillars of all species produce an identical hormone [#permalink]

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25 Mar 2005, 23:02
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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 neccesary.
E: Although the enzyme has been synthsized in the laboratory, no large-scale production facilities exist as yet.
[Reveal] Spoiler: OA

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Last edited by sayantanc2k on 20 Jul 2016, 11:44, edited 1 time in total.
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Re: Caterpillars of all species produce an identical hormone [#permalink]

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27 Mar 2005, 07:48
B)

C) should be out because it would still be advisable because it would eliminate the pests as well as many beneficial insects but we can assume that there are other beneficial factors so the goal would be achieved.
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27 Mar 2005, 09:58
not B, not C

not B---- because the question stem--

is asking--- "why the spraying of the enzyme is not advisable to kill the pests that go through caterpillar stage"

so in a way B is out of scope.

answere should be between A , D and E

D --seems best as spraying at diff time may result in the development of mature caterpillars-- hence not affected by the enzyme.
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Re: Caterpillars of all species produce an identical hormone [#permalink]

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27 Mar 2005, 22:57
I would go for D

A: Most species of caterpillar are subject to some natural predation.
out of scope
B: Many agricultural pests do not go through a caterpillar stage.
The question is only related to agricultural pests that go through a caterpillar stage and not to the pests that don't go through a caterpillar stage
C: Many agriculturally beneficial insects go through a caterpillar stage.
we care about agricultural pests that go through a caterpillar stage and not about beneficial insects
D: Since caterpillars of different species emerge at different times, several sprayings would be neccesary.
good one - sprayings + caterpillars included
E: Although the enzyme has been synthsized in the laboratory, no large-scale production facilities exist as yet.
out of scope
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Re: Caterpillars of all species produce an identical hormone [#permalink]

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28 Mar 2005, 00:34
1) Caterpillars of all species produce an identical hormone called "juvenile hormone" that maintains feeding behavior.
2) 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.
3) This enzyme can be synthesized and will, on being ingested by immature caterpillars, kill them by stopping them from feeding.

We'red asked to find a statement that supports the view that it is not advisable to eradicate pests that go through a caterpillar stage by spraying croplands with the enzyme.

A: Most species of caterpillar are subject to some natural predation.
- Out of scope

B: Many agricultural pests do not go through a caterpillar stage.
- If many pests do not go through a caterpilar stage, then there is really no point in spraying the croplands with the enzyme.

C: Many agriculturally beneficial insects go through a caterpillar stage.
- We're more concerned removing the caterpillars (but not via enzyme spraying) than preserving benficial insects.

D: Since caterpillars of different species emerge at different times, several sprayings would be neccesary.
- We're not concerned how many sprays in a year are needed. All we want is an answer choice that tells us why spraying enzymes on the croplands are not advisable.

E: Although the enzyme has been synthsized in the laboratory, no large-scale production facilities exist as yet.
- Out of scope

I'll take B
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28 Mar 2005, 00:36
dipaksingh wrote:
not B, not C

not B---- because the question stem--

is asking--- "why the spraying of the enzyme is not advisable to kill the pests that go through caterpillar stage"

so in a way B is out of scope.

answere should be between A , D and E

D --seems best as spraying at diff time may result in the development of mature caterpillars-- hence not affected by the enzyme.

D can be interpreted as 'you need to spary the enzyme whole year round since caterpillars mature at different times'. Interpreted this way, D cannot be the answer since it still not does not answer why it is not recommended to spray the enzyme.
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28 Mar 2005, 07:42
"C"....we r concerned abt getting rid of few pests that go thro the caterpillar stages...."B" is not it, becose even if many of the paets don't go thro the stages, but we can still achieve our goal to eradicate the ones that do go thro those stages, as we r not out to eradicate all pests. Only C has a bad side effect of spraying.
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28 Mar 2005, 09:22
ywilfred

according to the question-- "why the spraying of the enzyme is not advisable to kill the pests THAT go through caterpillar stage"

now if we pay attention to the question we get that the question is asking only about the pests (WHICH/THAT) passes through caterpillar stage.

so any answere stem about the pests without caterpillar stage is out of scope.
[/b]
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28 Mar 2005, 09:41
I would choose C too. Almost chosen B, but on a closer look at the question, it says why it is not advisable to use the enzyme to kill agricultural pests that go through a caterpillar stage.
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Re: Caterpillars of all species produce an identical hormone [#permalink]

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28 Mar 2005, 10:24
HongHu wrote:
I would choose C too. Almost chosen B, but on a closer look at the question, it says why it is not advisable to use the enzyme to kill agricultural pests that go through a caterpillar stage.

...there are some pests that DONT go through a caterpillar stage. so it WOULDNT eliminate them. so it WONT be advisable. isnt it B ?
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28 Mar 2005, 10:31
But it is not asking about those pest that do not go through a catapiller case.

For example, I say "We can't buy a red sweater because they are all too big for me." and you say "But this white sweater is not too big." Well but I'm not talking about white sweaters.
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28 Mar 2005, 14:42
SOS!!!

Can you check whether my understanding of the sentences is correct? I may understand wrongly and that's the key reason I didn't come up with a best choice. Here we go.....

Caterpillars of all species produce an identical hormone called "juvenile hormone" that maintains feeding behavior.

--->This is not a problem.

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.

---> How did you interpret this sentece? Is it saying "when a caterpillar becomes the pupation, people spread the enzyme which stops the production of juvenile hormone? I'm not clear the point here...

This enzyme can be synthesized and will, on being ingested by immature caterpillars, kill them by stopping them from feeding.

---> How did you interpret this sentence? Is it meaning the similar thing as to previous setence saying that "the enzyme kills the production of juvenile hormone.

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28 Mar 2005, 20:07
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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28 Mar 2005, 22:02
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.

Honghu/Gmatclub members, just like to check something about choice B and C.

B: Many agricultural pests do not go through a caterpillar stage.
C: Many agriculturally beneficial insects go through a caterpillar stage.

The passage asked why it's not a good idea to "eradicate agricultural pests" (taken striaght off the passage).

Now, in B, since many agricultural pest do not go through a caterpillar stage, then surly it's not a good idea to spray the enzymes since it's not going to save your crops.

However, C is good too. If many agriculturally beneficial insects go through a caterpillar stage, then you would be killing them by spraying the enzymes.

So given two good answers, how do you pick C? (or B, as in my case)
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28 Mar 2005, 22:42
GMAT will never give you two correct answers for CR questions.

Here's my reason why I chose C.

HongHu wrote:
Almost chosen B, but on a closer look at the question, it says why it is not advisable to use the enzyme to kill agricultural pests that go through a caterpillar stage.
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28 Mar 2005, 23:17
HongHu wrote:
GMAT will never give you two correct answers for CR questions.

Here's my reason why I chose C.

HongHu wrote:
Almost chosen B, but on a closer look at the question, it says why it is not advisable to use the enzyme to kill agricultural pests that go through a caterpillar stage.

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 ?
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29 Mar 2005, 10:42
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!
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29 Mar 2005, 10:48
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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29 Mar 2005, 11:04
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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Re: Caterpillars of all species produce an identical hormone [#permalink]

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29 Mar 2005, 15:49
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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Re: Caterpillars of all species produce an identical hormone   [#permalink] 29 Mar 2005, 15:49

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