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# Certain genetically modified strains of maize produce a

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Intern
Joined: 22 Sep 2004
Posts: 25
Certain genetically modified strains of maize produce a  [#permalink]

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06 May 2005, 14:03
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78% (02:03) correct 22% (02:25) wrong based on 2548 sessions

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Certain genetically modified strains of maize produce a powerful natural insecticide. The insecticide occurs throughout the plant, including its pollen. Maize pollen is dispersed by the wind and frequently blows onto milkweed plants that grow near maize fields. Caterpillars of monarch butterflies feed exclusively on milkweed leaves. When these caterpillars are fed milkweed leaves dusted with pollen from modified maize plants, they die. Therefore, by using genetically modified maize, farmers put monarch butterflies at risk.

Which of the following would it be most useful to determine in order to evaluate the argument?

A. Whether the natural insecticide is as effective against maize-eating insects as commercial insecticides typically used on maize are
B. Whether the pollen of genetically modified maize contains as much insecticide as other parts of these plants
C. Whether monarch butterfly caterpillars are actively feeding during the part of the growing season when maize is releasing pollen
D. Whether insects that feed on genetically modified maize plants are likely to be killed by insecticide from the plant's pollen
E. Whether any maize-eating insects compete with monarch caterpillars for the leaves of milkweed plants growing near maize fields
Director
Joined: 26 Apr 2004
Posts: 626
Location: Taiwan
Re: Certain genetically modified strains of maize produce a  [#permalink]

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08 May 2005, 06:41
2
1
ttar wrote:
Certain genetically modified strains of maize produce a powerful natural insecticide. The
insecticide occurs throughout the plant, including its pollen. Maize pollen is dispersed by
the wind and frequently blows onto milkweed plants that grow near maize fields.
Caterpillars of monarch butterflies feed exclusively on milkweed leaves. When these
caterpillars are fed milkweed leaves dusted with pollen from modified maize plants, they
die. Therefore, by using genetically modified maize, farmers put monarch butterflies at
risk.
Which of the following would it be most useful to determine in order to evaluate the
argument?
A. Whether the natural insecticide is as effective against maize-eating insects as
commercial insecticides typically used on maize are
B. Whether the pollen of genetically modified maize contains as much insecticide as
other parts of these plants
C. Whether monarch butterfly caterpillars are actively feeding during the part of the
growing season when maize is releasing pollen
D. Whether insects that feed on genetically modified maize plants are likely to be
killed by insecticide from the plantâ€™s pollen
E. Whether any maize-eating insects compete with monarch caterpillars for the
leaves of milkweed plants growing near maize fields

go for C.

A. Whether the natural insecticide is as effective against maize-eating insects as commercial insecticides typically used on maize are

not important
B. Whether the pollen of genetically modified maize contains as much insecticide as other parts of these plants
not important

C. Whether monarch butterfly caterpillars are actively feeding during the part of the growing season when maize is releasing pollen
if they eat, they die, or if they don't eat, they will not die.

D. Whether insects that feed on genetically modified maize plants are likely to be
killed by insecticide from the plantâ€™s pollen
we are talking about catepillar rather than insects.

E. Whether any maize-eating insects compete with monarch caterpillars for the
leaves of milkweed plants growing near maize fields

not important
Senior Manager
Joined: 14 Jul 2004
Posts: 414
Re: Certain genetically modified strains of maize produce a  [#permalink]

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08 May 2005, 07:57
2
2
ttar wrote:
Certain genetically modified strains of maize produce a powerful natural insecticide. The
insecticide occurs throughout the plant, including its pollen. Maize pollen is dispersed by
the wind and frequently blows onto milkweed plants that grow near maize fields.
Caterpillars of monarch butterflies feed exclusively on milkweed leaves. When these
caterpillars are fed milkweed leaves dusted with pollen from modified maize plants, they
die. Therefore, by using genetically modified maize, farmers put monarch butterflies at
risk.
Which of the following would it be most useful to determine in order to evaluate the
argument?
A. Whether the natural insecticide is as effective against maize-eating insects as
commercial insecticides typically used on maize are
B. Whether the pollen of genetically modified maize contains as much insecticide as
other parts of these plants
C. Whether monarch butterfly caterpillars are actively feeding during the part of the
growing season when maize is releasing pollen
D. Whether insects that feed on genetically modified maize plants are likely to be
killed by insecticide from the plantâ€™s pollen
E. Whether any maize-eating insects compete with monarch caterpillars for the
leaves of milkweed plants growing near maize fields

Question Type: Evaluate an argument.
Conclusion: Genetically modified maize present danger to butterflies.
My AC is C.

A: Boot out. Argument stem doesnt discuss about "maize-eating insects" and commerical Vs natural insecticide. Out of Scope.
B: Boot out. The argument stem isnt concerned with which part of hte maize plant produces most or least insectiticide.
C: Good Point. Are the catterpillar feeding during the time pollen is released? Keep AC.
D: Boot out. Out of Scope? Insects? We are talking of the sequence of events between maize plants and catterpillar.
E: Boot out. Out of Scope. Why does it matter if there is competition or not.
Director
Joined: 20 Sep 2006
Posts: 527
Re: Certain genetically modified strains of maize produce a  [#permalink]

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09 Sep 2008, 20:50
2
2
IMO C

Maze insecticide -- goes to --> Polen --- thru wind it goes to --> Milkweed --from its leaves it goes to --> Caterpiller and then Caterpiller dies.

We want to make sure this all happens at same time. We dont want the polen to be release during the onth of Jan only and then Caterpiller eating leaves after 6 months. By that time ofcourse the dust from leaves will be gone and that means there is somthing else in leave that is causing Caterpiler to die .. after eating the leaves.

Hope I am on right track and this help...
Intern
Joined: 25 Jan 2013
Posts: 34
Location: Spain
Concentration: Finance, Other
Schools: Wharton '17 (S)
GMAT 1: 740 Q49 V42
Re: Certain genetically modified strains of maize produce a  [#permalink]

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23 Sep 2014, 03:16
2

To solve this kind of evaluate questions, one must do the following:

1.-Understand the argument. For this, one have to read the stimulus very, very closely and literally.

Argument:

Genetically modified maiz produces natural insecticide that will be present even in the pollen.

Pollen is dispersed and reaches milkweed.

Caterpillars die when ARE FED with milkweed leaves.

Conclusion: using this genetically modified maize, butterflies are put at risk.

2.-In evaluate questions, we have to determine which of the answers choices has a content that could impact the conclusion. Evaluate C and E.

C) If we say "Yes, the caterpillars effectively feed on milkweed leaves when these leaves have pollen with insecticide" the conclusion is reinforced. By saying "no, the caterpillars feed on milkweed leaves in a season when leaves do not have pollen with insecticide", the conclusion is clearly weakened: If the caterpillars feed in a time when there is no insecticide in the milkweed leaves, no danger is prompted by using the genetically modified crops.

In here it is important to realize that the stimulus says that caterpillars ARE FED -passive-, but do not suggest anything about the natural behaviour of caterpillars: if the would normally eat leaves when these leaves have insectivide.

E) incorrect. If one affirm the question - yes, they have competitors - there is no impact in the conclusion, because will still do not know when caterpillars feed on milkweed leaves. If we say "no, they have no competitors", the same.

As per the previous post, the fact that E it is the only that explicitly talks about leaves, does not mean that other answers are not talking indirectly about leaves. In fact, C does because it raises the question of when the milkweed leaves have pollen with insecticide.

Hope this helps.
Director
Joined: 25 Nov 2004
Posts: 976
Re: Certain genetically modified strains of maize produce a  [#permalink]

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07 May 2005, 21:35
1
B. Whether the pollen of genetically modified maize contains as much insecticide as other parts of these plants
Manager
Joined: 10 Dec 2004
Posts: 202
Re: Certain genetically modified strains of maize produce a  [#permalink]

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08 May 2005, 06:14
1
1
"E"

Whether the natural insecticide is as effective against maize-eating insects as
commercial insecticides typically used on maize are

Outta scope.

B. Whether the pollen of genetically modified maize contains as much insecticide as
other parts of these plants

Does not matter. The reason is presence of insectiside and not really amount. INcorrect.

C. Whether monarch butterfly caterpillars are actively feeding during the part of the
growing season when maize is releasing pollen

We already know that butterflies are eating the weed with pollen. Even if they are not actively feeding and still dying , does not help.

D. Whether insects that feed on genetically modified maize plants are likely to be
killed by insecticide from the plantâ€™s pollen

Even if we know this, it does not address buttefflies issue.

E. Whether any maize-eating insects compete with monarch caterpillars for the
leaves of milkweed plants growing near maize fields

If this is true then insecticide may not be the cause.
Senior Manager
Joined: 14 Jul 2004
Posts: 414
Re: Certain genetically modified strains of maize produce a  [#permalink]

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11 May 2005, 08:45
1

If someone else knows the OA please post.
Manager
Joined: 12 Jul 2003
Posts: 136
Re: Certain genetically modified strains of maize produce a  [#permalink]

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11 May 2005, 09:34
1
another one for c.

caterpillars eat===>>>die
caterpillars dont eat===>>happily live

Best..
Intern
Joined: 07 Mar 2012
Posts: 31
Location: India
Concentration: General Management, Nonprofit
GMAT Date: 09-13-2013
GPA: 4
WE: Engineering (Energy and Utilities)
Re: Certain genetically modified strains of maize produce a  [#permalink]

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16 Jul 2013, 22:11
1
C Correct.
1.monarch butterflies are actually at risk only when they eat milkweed leaves dusted with pollen.
2.so when pollen is not present on milkweed leaves,monarch butterflies safely eat them.
3.so if monarch butterflies are not actively eating milkweed leaves during maize growing season monarch butterflies will be not at risk.

1 kudo if you get clearly!!
_________________
Remember that potential unused turns into pain. So dedicate yourself to expressing your best.
Senior Manager
Joined: 05 Nov 2012
Posts: 373
Concentration: Technology, Other
Re: Certain genetically modified strains of maize produce a  [#permalink]

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07 Jan 2015, 21:35
1
My 2 cents. Though E and C both sound a valid contender, there are couple of reasons to prefer C over E.

Premise:
Certain genetically modified strains of maize produce a powerful natural insecticide.
The insecticide occurs throughout the plant, including its pollen. Maize pollen is dispersed by the wind and frequently blows onto milkweed plants that grow near maize fields.
Caterpillars of monarch butterflies feed exclusively on milkweed leaves. When these caterpillars are fed milkweed leaves dusted with pollen from modified maize plants, they die.

Conclusion:
Therefore, by using genetically modified maize, farmers put monarch butterflies at risk.

Which of the following would it be most useful to determine in order to evaluate the argument?

E. Whether any maize-eating insects compete with monarch caterpillars for the leaves of milkweed plants growing near maize fields
>>There can be multiple possibilities here. It may be that insects compete with MC for leaves when maze r not in pollen phase,, a very small proportion of insects competes with MC Or, insects and MC eats different part of leaves. etc.
If any of these options are true then we can't confidently evaluate the argument. Also C mentions pollen and MC feeding period, a link that is mentioned in premise and a crucial factor to evaluate the argument.

C. Whether monarch butterfly caterpillars are actively feeding during the part of the growing season when maize is releasing pollen.
Yes: Yes it supports the conclusion.
No: Then it weaken the conclusion.
Intern
Joined: 10 Mar 2005
Posts: 13
Location: india
Re: Certain genetically modified strains of maize produce a  [#permalink]

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07 May 2005, 23:54
C.

The arguement is that by using genetically modified maize, farmers put monarch butterflies at
risk.

The caterpillars die if they eat the pollen at all. They must eat it when the pollen spreads.
Since the question says that the caterpillars die when they eat the leaves in which the pollen is present. B is out.
Intern
Joined: 15 Aug 2004
Posts: 22
Re: Certain genetically modified strains of maize produce a  [#permalink]

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10 May 2005, 09:02
1
Between E & C .

E looks very generic (about insects & not specific to caterpillar). Hence eliminate. I shall go with C

OA ?
CEO
Joined: 07 Jul 2004
Posts: 2916
Location: Singapore
Re: Certain genetically modified strains of maize produce a  [#permalink]

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10 May 2005, 18:19
I'll go with C. If the monach butterfly caterpillars feed at other parts of the season when pollen is not released from the maize plant, then they would not get milkweed leaves laced with natural insecticide, and thus would not die.
Senior Manager
Joined: 07 Nov 2004
Posts: 250
Re: Certain genetically modified strains of maize produce a  [#permalink]

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11 May 2005, 09:09
yaa, C.

because the stem already states that insecticide contained in pollen can kill butterfly caterpillars, so B is irrelevant.
Manager
Joined: 21 Apr 2005
Posts: 87
Location: Atlanta , GA
Re: Certain genetically modified strains of maize produce a  [#permalink]

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11 May 2005, 13:19
Another 'C'

for the same reason as Doloris gave
Senior Manager
Joined: 14 Jul 2004
Posts: 414
Re: Certain genetically modified strains of maize produce a  [#permalink]

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14 May 2005, 10:48
Senior Manager
Joined: 14 Jul 2004
Posts: 414
Re: Certain genetically modified strains of maize produce a  [#permalink]

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16 May 2005, 19:05
Director
Joined: 17 Jun 2008
Posts: 813
Re: Certain genetically modified strains of maize produce a  [#permalink]

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09 Sep 2008, 18:51
1
Certain genetically modified strains of maize produce a powerful natural insecticide. The
insecticide occurs throughout the plant, including its pollen. Maize pollen is dispersed by
the wind and frequently blows onto milkweed plants that grow near maize fields.
Caterpillars of monarch butterflies feed exclusively on milkweed leaves. When these
caterpillars are fed milkweed leaves dusted with pollen from modified maize plants, they
die. Therefore, by using genetically modified maize, farmers put monarch butterflies at
risk.

Which of the following would it be most useful to determine in order to evaluate the
argument?

A. Whether the natural insecticide is as effective against maize-eating insects as
commercial insecticides typically used on maize are
B. Whether the pollen of genetically modified maize contains as much insecticide as
other parts of these plants
19
C. Whether monarch butterfly caterpillars are actively feeding during the part of the
growing season when maize is releasing pollen
D. Whether insects that feed on genetically modified maize plants are likely to be
killed by insecticide from the plant’s pollen
E. Whether any maize-eating insects compete with monarch caterpillars for the
leaves of milkweed plants growing near maize fields
Director
Joined: 17 Jun 2008
Posts: 813
Re: Certain genetically modified strains of maize produce a  [#permalink]

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09 Sep 2008, 20:47
kindly post in the explanations
Re: Certain genetically modified strains of maize produce a   [#permalink] 09 Sep 2008, 20:47

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