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Which of the following most logically completes the [#permalink]
 27 Jun 2008, 16:46
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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
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Director
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IMO D.
Because histadine will make metal inert, so earth can be used for other plants as well.
But a close though should also be give to C.
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i will go with C...close enough was D..but what if over time..metals loose their affectivness because of other factors???
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Answer should be D A. histidine is found in all parts of the plant—roots, stem, leaves, and flowers Irrelevant...What matters is that the plant actually produces histidine. WHERE it is located does not matter. In fact, I'm pretty sure it can be argued that the histidines would be most concentrated at the roots (point of impact with toxic 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 again, irrelevantC. others of the closely related group of plants are also found to produce histidine in large quantities doesnt support the hypothesis. just because other related plants produce histidine as well doesn't guarantee that it is the histidine that allows the plants to thriveD. 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 perfect experiment to prove hypothesis. place plant in toxic soil. over a period of time the toxicity goes down and allows other plants to grow in the soil as well, most likely due to histidine productionE. the concentration of histidine in the growing herb declines as the plant approaches maturity irrelevant. its like saying the army of a nation shrinks as it's level of safety increases
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Last edited by GMATobliterator on 27 Jun 2008, 19:46, edited 1 time in total.
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rpmodi 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
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 A is the best!
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sondenso wrote:
A is the best!
Why?
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I have not seen the correct answer yet .
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rpmodi 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 ______.
E. the concentration of histidine in the growing herb declines as the plant approaches
maturity E. argument says that 'the herb produces large amounts of histidine'...and that it must be 'the herb's high histidine production that allows it to grow..' So, if it's growing, it'll continue to produce histidine, but as it reaches maturity it will not produce as much. therefore, should decline as it approaches maturity
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C for me as it mentions other plants in the premise and some relation needs to be showed with the premise in fully supported proof...what is the OA?
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