Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 25 May 2017, 19:25

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Caterpillars of all species produce an identical hormone

Author Message
TAGS:

### Hide Tags

Manager
Joined: 28 Jan 2005
Posts: 78
Followers: 1

Kudos [?]: 139 [0], given: 0

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

### Show Tags

26 Mar 2005, 00:02
4
This post was
BOOKMARKED
00:00

Difficulty:

35% (medium)

Question Stats:

71% (02:19) correct 29% (01:28) wrong based on 334 sessions

### HideShow timer Statistics

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

_________________

Best regards,

Last edited by sayantanc2k on 20 Jul 2016, 12:44, edited 1 time in total.
If you have any questions
New!
Manager
Joined: 22 Apr 2013
Posts: 95
Location: India
Concentration: Finance
GMAT 1: 660 Q48 V33
Followers: 1

Kudos [?]: 83 [1] , given: 32

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

### Show Tags

14 Oct 2013, 06:27
1
KUDOS
jlgdr wrote:
Taku wrote:
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.

Has anyone found the OA for this one? I chose B by POE because it is the answer choice that to me makes more sense.
Let's quickly go through the answer choices
A: Out of scope
B: This may be right, still I'm not too sure because it uses the word many, what about the others? But i'll leave it in for the time being.
C: This actually says the opposite of what we want. This would say why it WOULD be advisable
D: So what? If different sprayings are necessary then let's do it. Not too big of a deal. Still I'll leave it in just in case
E: Out of scope. I don't really care as long as I can get it somehow. And this is not what we are asked

So between B and D. Not be advisable huh? I think B is just a little bit better as an answer choice but to me it is a really close call unless I am missing something.
Experts please? Any words of wisdom on the passage?

Thanks
Cheers
J

The OA is C for this question. It is in OG 12th Edition.

A Spraying would eradicate all pests that go through a caterpillar stage and so is more eff ective than
natural predators are. This statement provides no reason not to spray.
B Spraying aff ects only those agricultural pests that do go through a caterpillar stage, so this
statement is irrelevant.
C Correct. Th is statement properly identifi es evidence that strengthens the argument against
spraying.
D The need to spray repeatedly does not provide any significant evidence that spraying is
inadvisable, but simply suggests that the process will be more complicated.
E The mere lack of current production facilities does not mean that it would be inadvisable to
develop and use the spray in the future.
Th e correct answer is C.
VP
Joined: 30 Sep 2004
Posts: 1482
Location: Germany
Followers: 6

Kudos [?]: 348 [0], given: 0

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

### Show Tags

27 Mar 2005, 08:48
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.
Manager
Joined: 03 Nov 2004
Posts: 184
Followers: 1

Kudos [?]: 16 [0], given: 0

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

### Show Tags

27 Mar 2005, 10:58
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.
VP
Joined: 13 Jun 2004
Posts: 1115
Location: London, UK
Schools: Tuck'08
Followers: 7

Kudos [?]: 45 [0], given: 0

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

### Show Tags

27 Mar 2005, 23:57
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
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5045
Location: Singapore
Followers: 31

Kudos [?]: 376 [0], given: 0

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

### Show Tags

28 Mar 2005, 01:34
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
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5045
Location: Singapore
Followers: 31

Kudos [?]: 376 [0], given: 0

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

### Show Tags

28 Mar 2005, 01:36
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.
VP
Joined: 18 Nov 2004
Posts: 1436
Followers: 2

Kudos [?]: 39 [0], given: 0

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

### Show Tags

28 Mar 2005, 08:42
"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.
Manager
Joined: 03 Nov 2004
Posts: 184
Followers: 1

Kudos [?]: 16 [0], given: 0

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

### Show Tags

28 Mar 2005, 10:22
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]
SVP
Joined: 03 Jan 2005
Posts: 2236
Followers: 16

Kudos [?]: 342 [0], given: 0

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

### Show Tags

28 Mar 2005, 10:41
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.
VP
Joined: 30 Sep 2004
Posts: 1482
Location: Germany
Followers: 6

Kudos [?]: 348 [0], given: 0

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

### Show Tags

28 Mar 2005, 11:24
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 ?
SVP
Joined: 03 Jan 2005
Posts: 2236
Followers: 16

Kudos [?]: 342 [0], given: 0

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

### Show Tags

28 Mar 2005, 11:31
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.
Manager
Joined: 28 Jan 2005
Posts: 78
Followers: 1

Kudos [?]: 139 [0], given: 0

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

### Show Tags

28 Mar 2005, 15:42
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.

_________________

Best regards,

SVP
Joined: 03 Jan 2005
Posts: 2236
Followers: 16

Kudos [?]: 342 [0], given: 0

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

### Show Tags

28 Mar 2005, 21:07
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.
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5045
Location: Singapore
Followers: 31

Kudos [?]: 376 [0], given: 0

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

### Show Tags

28 Mar 2005, 23:02
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)
SVP
Joined: 03 Jan 2005
Posts: 2236
Followers: 16

Kudos [?]: 342 [0], given: 0

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

### Show Tags

28 Mar 2005, 23:42
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.
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5045
Location: Singapore
Followers: 31

Kudos [?]: 376 [0], given: 0

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

### Show Tags

29 Mar 2005, 00:17
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 ?
SVP
Joined: 03 Jan 2005
Posts: 2236
Followers: 16

Kudos [?]: 342 [0], given: 0

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

### Show Tags

29 Mar 2005, 11:42
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!
SVP
Joined: 03 Jan 2005
Posts: 2236
Followers: 16

Kudos [?]: 342 [0], given: 0

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

### Show Tags

29 Mar 2005, 11:48
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.
Manager
Joined: 28 Oct 2004
Posts: 95
Location: Irvine, CA
Followers: 1

Kudos [?]: 0 [0], given: 0

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

### Show Tags

29 Mar 2005, 12:04
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?
_________________

discipline is what I need.

Re: Caterpillars of all species produce an identical hormone   [#permalink] 29 Mar 2005, 12:04

Go to page    1   2   3    Next  [ 46 posts ]

Similar topics Replies Last post
Similar
Topics:
1 Politician: All nations that place a high tax on income produce thereb 2 09 Mar 2017, 16:03
10 All orchid species that are pollinated solely by insects 4 18 Aug 2013, 06:51
Almost all microbe species live together in dense, 2 06 Jun 2012, 05:11
2 Millions of identical copies of a plant can be produced 6 17 Jul 2016, 13:56
3 When a caterpillar emerges from the egg on a tree branch, it 7 09 Feb 2017, 04:07
Display posts from previous: Sort by