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# Which of the following most logically completes the

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Which of the following most logically completes the [#permalink]

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26 Jul 2010, 12:31
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Which of the following most logically completes the argument?
A certain cultivated herb is one of a group of closely related plants that thrive in soil
with high concentrations of metals that are toxic to most other plants. Agronomists
studying the herb have discovered that it produces large amounts of histidine, an
amino acid that, in test-tube solutions, renders these metals chemically inert. Possibly,
therefore, the herb’s high histidine production is what allows it to grow in metal-rich
soils, a hypothesis that would gain support if ______.
A. histidine is found in all parts of the plant—roots, stem, leaves, and flowers
B. the herb’s high level of histidine production is found to be associated with an
unusually low level of production of other amino acids
C. others of the closely related group of plants are also found to produce histidine
in large quantities
D. cultivation of the herb in soil with high concentrations of the metals will, over
an extended period, make the soil suitable for plants to which the metals are
toxic
E. the concentration of histidine in the growing herb declines as the plant
approaches maturity

This one has already been discussed in other threads with OA E. However, according to my source OA is D. And by the way, Im with C.

Actually for me, C, D and E are correct:

C.- If others of the closely related group of plants are also found to produce histidine
in large quantities, that histidine enable the plants to live with the metal.
D.- herb produces histidine, which makes metal inert, so other plants can also live there
E.- histidine enables herb to grow, wo in its maturity the concentration of histidine therefore declien.

All 3 are correct.
[Reveal] Spoiler: OA

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Re: A certain cultivated herb [#permalink]

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26 Jul 2010, 12:56
I go with D.

Premise1: cultivated herb group thrive in soil with high concentration of metals , toxic to other

Premise2: Herb produces histidine, amino acid which helps them to neglect the effect of metal

Hypothesis: Histidine nullifies affected Herb high with histidine allows to grow metal-rich soils

Lets take option:

(a) histidine is found in all parts, we already know the facts that Herb produces histidine, and presence in different parts will neither support nor weaken the hypothesis

(b) histidine production is associated with low level of amino acid, if this is true then it weakens as amino acid is the one which nullifies the effect of metal

(c) if other closely related groups also produce histidine, this fact does not support our conclusion it just add up another information/premise

(d) cultivation over longer period makes soil suitable for plant growth to which metals are toxic, means Histidine present in the herb is nullifying the effect of the metal, which is supporting the hypothesis

(e) if concentration of histidine declines when plant mature, this facts is no where near to the hypothesis, yes if something is mentioned about life cycle of plant then this might supported the hypothese
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Re: A certain cultivated herb [#permalink]

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26 Jul 2010, 19:17
A certain cultivated herb is one of a group of closely related plants that thrive in soil
with high concentrations of metals that are toxic to most other plants. Agronomists
studying the herb have discovered that it produces large amounts of histidine, an
amino acid that, in test-tube solutions, renders these metals chemically inert. Possibly,
therefore, the herb’s high histidine production is what allows it to grow in metal-rich
soils, a hypothesis that would gain support if ______.
A. histidine is found in all parts of the plant—roots, stem, leaves, and flowers < does not really provide any extra support for plants survival in metal rich soil>
B. the herb’s high level of histidine production is found to be associated with an
unusually low level of production of other amino acids <good to know but how does it help in supporting>
C. others of the closely related group of plants are also found to produce histidine
in large quantities <this just provides info that similar plants exist does not provide info about metal rich soil growth>
D. cultivation of the herb in soil with high concentrations of the metals will, over
an extended period, make the soil suitable for plants to which the metals are
toxic <bingo, the histidine converts metal to inert state there by making the soil better for future plant growth >
E. the concentration of histidine in the growing herb declines as the plant
approaches maturity <ok not relevant>
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Re: A certain cultivated herb [#permalink]

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26 Jul 2010, 20:17
I'm not sure I understand why it would be D. It only says that it produces histidine, but not that the histidine it produces affects the soil in any way. If anything, I took it as the histidine produced allows the plant to grow in the soil by neutralizing the metal internally.
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Re: A certain cultivated herb [#permalink]

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26 Jul 2010, 21:11
[quote="noboru"]Which of the following most logically completes the argument?
A certain cultivated herb is one of a group of closely related plants that thrive in soil
with high concentrations of metals that are toxic to most other plants. Agronomists
studying the herb have discovered that it produces large amounts of histidine, an
amino acid that, in test-tube solutions, renders these metals chemically inert. Possibly,
therefore, the herb’s high histidine production is what allows it to grow in metal-rich
soils, a hypothesis that would gain support if ______.
A. histidine is found in all parts of the plant—roots, stem, leaves, and flowers --> Nothing to do with consumption of histidine.B. the herb’s high level of histidine production is found to be associated with an
unusually low level of production of other amino acids --> Nothing to do with other amino acids.
C. others of the closely related group of plants are also found to produce histidine
in large quantities --> Nothing to do with other plants.
D. cultivation of the herb in soil with high concentrations of the metals will, over
an extended period, make the soil suitable for plants to which the metals are
toxic CORRECT
E. the concentration of histidine in the growing herb declines as the plant
approaches maturity --> Nothing to do with declining of histidine.
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Re: A certain cultivated herb [#permalink]

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27 Jul 2010, 08:04
whats the source?
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Re: A certain cultivated herb [#permalink]

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27 Jul 2010, 08:07
dwivedys wrote:
whats the source?

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Re: A certain cultivated herb [#permalink]

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27 Jul 2010, 08:58
I pick D

We need to strengthen the hypothesis. C and E do not explain why by producing histidine can help the the plant grows.

D - By producing histidine, it helps in the long term by making the soil more suitable for the plant.

D rules
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Re: A certain cultivated herb [#permalink]

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27 Jul 2010, 10:34
E is correct

A. In what parts of the plant is histidine found is irrelevant to the scope

B. weaken the argument by stating that OTHER AMINO ACIDS is actually responsible for making the metal in the soil chemically inert.

C. Refers to other herbs in group.

D. False because the argument by stating that adaptability of the herb to toxic soil is the reason why the herb thrives in metal-rich soil.

E. Correct
histidine allows the herb to GROW.
It means that as long as the herb is growing, histidine is high and as the herb approaches MATURITY the concentration of histidine declines.
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Re: A certain cultivated herb [#permalink]

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27 Jul 2010, 10:52
calling for an expert view !!!
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Re: A certain cultivated herb [#permalink]

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27 Jul 2010, 11:03
my pick is D.

Found below explanation on another forum.

Quote:
C says others, not all others.

Does the plant survive by producing a chemical that renders the metal inert? Can we extrapolate what happens in a test tube to an actual field? Was the amount of histidine added to the test tube realistic? If so, D should be true.

D, if true, provides evidence that the mechanism by which this plant survives is by rendering the metal inert. It's not that the metal has no effect on the plant: the plant actually produces a chemical that deprives the metal of its destructive properties. I think that the hypothesis would lose credibility if D were not true.

C would be MUCH more convincing if it said that plants outside this group that cannot survive do not produce histidine. If the plants are closely related, I don't find it far-fetched to suspect that many of them produce histidine
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Re: A certain cultivated herb [#permalink]

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27 Jul 2010, 11:37
I went with C....nothing I can support xcept for saying that it would prove .....they all produce high concentrations ........

D.......I don't really understand much ........

OMG ........are all questions from GMAT Prep, OG ..... I m not using OG to avoid questions in GMAT Prep .........I think after the forums I ll just directly put in the answer ..........Hope it doesn't happen
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Re: A certain cultivated herb [#permalink]

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16 Aug 2010, 10:41
+1 D
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Re: A certain cultivated herb [#permalink]

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18 Aug 2010, 01:34
D
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Re: A certain cultivated herb [#permalink]

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07 Sep 2010, 04:30
IMO D...nice one!!
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Re: A certain cultivated herb [#permalink]

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07 Sep 2010, 05:32
D
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Re: A certain cultivated herb [#permalink]

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08 Sep 2010, 06:01
The argument is that the plants are able to thrive in the soil because the histidine renders certain metals in the soil inert. These metals normally kill plants, so if the argument is correct and the histidine is rendering the metals inert, then by continuing to grow these plants, eventually most or all of the metal will be gone and the soil will be usable by other plants. (D) fits this theory.

(C) only states that the other plants which can also grow in this soil make histidine. This supports the argument that histidine is what allows them to grow, but doesn't address the theory of WHY it allows them to grow, which is what you're looking for.
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Re: A certain cultivated herb [#permalink]

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08 Sep 2010, 08:26
noboru wrote:
Which of the following most logically completes the argument?
A certain cultivated herb is one of a group of closely related plants that thrive in soil
with high concentrations of metals that are toxic to most other plants. Agronomists
studying the herb have discovered that it produces large amounts of histidine, an
amino acid that, in test-tube solutions, renders these metals chemically inert. Possibly,
therefore, the herb’s high histidine production is what allows it to grow in metal-rich
soils, a hypothesis that would gain support if ______.
A. histidine is found in all parts of the plant—roots, stem, leaves, and flowers
B. the herb’s high level of histidine production is found to be associated with an
unusually low level of production of other amino acids
C. others of the closely related group of plants are also found to produce histidine
in large quantities Nothing here talks about the relation of histidine to toxic metals in the soil and how histidine renders these metals inert
D. cultivation of the herb in soil with high concentrations of the metals will, over
an extended period, make the soil suitable for plants to which the metals are
toxic If histidine renders the chemical inert in the test tube it should do so in the soil too. And considering that this statement is true then it proves that it is the high histidine that helps the herb grow
E. the concentration of histidine in the growing herb declines as the plant
approaches maturity Nothing in the passage talks about increasing or decreasing histidine in relation to age.

This one has already been discussed in other threads with OA E. However, according to my source OA is D. And by the way, Im with C.

Actually for me, C, D and E are correct:

C.- If others of the closely related group of plants are also found to produce histidine
in large quantities, that histidine enable the plants to live with the metal.
D.- herb produces histidine, which makes metal inert, so other plants can also live there
E.- histidine enables herb to grow, wo in its maturity the concentration of histidine therefore declien.

All 3 are correct.

Only D is correct the other two are irrelevant
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Re: A certain cultivated herb [#permalink]

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08 Sep 2010, 10:42
d...
kUDOS FOR ME
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Re: A certain cultivated herb [#permalink]

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15 Oct 2010, 00:27
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IMO D..
E is not correct as "E. the concentration of histidine in the growing herb declines as the plant approaches maturity"

argument doesnt mention anythng abt age....
even at maturity plant grows----so doesnt satisfy "the herb’s high histidine production is what allows it to grow in metal-rich
soils"
Re: A certain cultivated herb   [#permalink] 15 Oct 2010, 00:27

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