A certain cultivated herb is one of a group of closely : GMAT Critical Reasoning (CR)
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# A certain cultivated herb is one of a group of closely

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A certain cultivated herb is one of a group of closely [#permalink]

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15 Sep 2009, 08:48
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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
[Reveal] Spoiler: OA
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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17 Sep 2009, 13:34
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I'll go with C.
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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17 Sep 2009, 14:02
I will go with E. The hypothesis talks about how herb’s high histidine production is what allows it to grow in metal-rich soils. So logically, once the plant is matured, it no more requires to produce histidine.

What is OA?
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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17 Sep 2009, 14:11
I will go with C.

If the herb survives due to neutralising effect of histidine on toxic metals then other herbs of the same family should (most likely) be surviving due to the same reason.
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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17 Sep 2009, 18:05
I will go with D.
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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17 Sep 2009, 18:44
C for me
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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17 Sep 2009, 21:21
OA is E....

Nobody has given me a proper explanation except for one.
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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18 Sep 2009, 06:27
7
KUDOS
Ok, allow me to explain this one...

The sentence marked in RED below is the actual hypothesis.:

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
______.

Now lets go through each option to see if it supports the hypothesis marked in RED in above argument.

A. histidine is found in all parts of the plant—roots, stem, leaves, and flowers - This does not indicate that the histidine is responsible for the growth of herb in metal-rich soils. So does not support the hypothesis
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 - Same as A. Reject...
C. others of the closely related group of plants are also found to produce histidine in large quantities - Many guys picked up this option. Let me tell you why this is NOT the correct answer. The sentence simply indicates that other closely related group of plants also produce histidine in large quantities. This statement might be true, but it does not prove that histidine is indeed responsible for herb's growth in metal-rich soil. It might be possible that some other element is responsible for the growth of plants, which is not yet being discovered. So this statement does not provide any support to the hypothesis.
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 - huh(?!), REJECT.... I don't think you guys want an explanation for this?
E. the concentration of histidine in the growing herb declines as the plant approaches maturity - BINGO!!!! Read the hypothesis again. It says that the histidine helps the plants to GROW in the metal-rich soil. This is the only option which talks about growth of the herb. If the histidine is only helping the plants to grow, then logically it is not even required once the plant is fully grown. Also, this is the only BEST answer we have. Remember (?) BEST IS NOT IDEAL?

---------------------------

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Re: A certain cultivated herb is one of a group of closely [#permalink]

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18 Sep 2009, 09:09
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hgp2k wrote:
Ok, allow me to explain this one...

The sentence marked in RED below is the actual hypothesis.:

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
______.

Now lets go through each option to see if it supports the hypothesis marked in RED in above argument.

A. histidine is found in all parts of the plant—roots, stem, leaves, and flowers - This does not indicate that the histidine is responsible for the growth of herb in metal-rich soils. So does not support the hypothesis
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 - Same as A. Reject...
C. others of the closely related group of plants are also found to produce histidine in large quantities - Many guys picked up this option. Let me tell you why this is NOT the correct answer. The sentence simply indicates that other closely related group of plants also produce histidine in large quantities. This statement might be true, but it does not prove that histidine is indeed responsible for herb's growth in metal-rich soil. It might be possible that some other element is responsible for the growth of plants, which is not yet being discovered. So this statement does not provide any support to the hypothesis.
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 - huh(?!), REJECT.... I don't think you guys want an explanation for this?
E. the concentration of histidine in the growing herb declines as the plant approaches maturity - BINGO!!!! Read the hypothesis again. It says that the histidine helps the plants to GROW in the metal-rich soil. This is the only option which talks about growth of the herb. If the histidine is only helping the plants to grow, then logically it is not even required once the plant is fully grown. Also, this is the only BEST answer we have. Remember (?) BEST IS NOT IDEAL?

---------------------------

Consider KUDOS if you found my post helpful

Nice explanation...
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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18 Sep 2009, 15:14
I would definitely like to know the source of this question
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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18 Sep 2009, 16:51
1
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gurpreet07 wrote:
hgp2k wrote:
Ok, allow me to explain this one...

The sentence marked in RED below is the actual hypothesis.:

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
______.

Now lets go through each option to see if it supports the hypothesis marked in RED in above argument.

A. histidine is found in all parts of the plant—roots, stem, leaves, and flowers - This does not indicate that the histidine is responsible for the growth of herb in metal-rich soils. So does not support the hypothesis
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 - Same as A. Reject...
C. others of the closely related group of plants are also found to produce histidine in large quantities - Many guys picked up this option. Let me tell you why this is NOT the correct answer. The sentence simply indicates that other closely related group of plants also produce histidine in large quantities. This statement might be true, but it does not prove that histidine is indeed responsible for herb's growth in metal-rich soil. It might be possible that some other element is responsible for the growth of plants, which is not yet being discovered. So this statement does not provide any support to the hypothesis.
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 - huh(?!), REJECT.... I don't think you guys want an explanation for this?
E. the concentration of histidine in the growing herb declines as the plant approaches maturity - BINGO!!!! Read the hypothesis again. It says that the histidine helps the plants to GROW in the metal-rich soil. This is the only option which talks about growth of the herb. If the histidine is only helping the plants to grow, then logically it is not even required once the plant is fully grown. Also, this is the only BEST answer we have. Remember (?) BEST IS NOT IDEAL?

---------------------------

Consider KUDOS if you found my post helpful

Nice explanation...

Consider KUDOS
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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18 Sep 2009, 20:42
ichha148 wrote:
I would definitely like to know the source of this question

source is an score top VIP sets.
but know the website has been banned by the GMAC....
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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18 Sep 2009, 20:45
hgp2k wrote:
gurpreet07 wrote:
hgp2k wrote:
Ok, allow me to explain this one...

The sentence marked in RED below is the actual hypothesis.:

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
______.

Now lets go through each option to see if it supports the hypothesis marked in RED in above argument.

A. histidine is found in all parts of the plant—roots, stem, leaves, and flowers - This does not indicate that the histidine is responsible for the growth of herb in metal-rich soils. So does not support the hypothesis
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 - Same as A. Reject...
C. others of the closely related group of plants are also found to produce histidine in large quantities - Many guys picked up this option. Let me tell you why this is NOT the correct answer. The sentence simply indicates that other closely related group of plants also produce histidine in large quantities. This statement might be true, but it does not prove that histidine is indeed responsible for herb's growth in metal-rich soil. It might be possible that some other element is responsible for the growth of plants, which is not yet being discovered. So this statement does not provide any support to the hypothesis.
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 - huh(?!), REJECT.... I don't think you guys want an explanation for this?
E. the concentration of histidine in the growing herb declines as the plant approaches maturity - BINGO!!!! Read the hypothesis again. It says that the histidine helps the plants to GROW in the metal-rich soil. This is the only option which talks about growth of the herb. If the histidine is only helping the plants to grow, then logically it is not even required once the plant is fully grown. Also, this is the only BEST answer we have. Remember (?) BEST IS NOT IDEAL?

---------------------------

Consider KUDOS if you found my post helpful

Nice explanation...

Consider KUDOS

Kudos for your nice work and timely response
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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26 Sep 2009, 03:01
1
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One more kudo from Me.
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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26 Sep 2009, 05:20
What's wrong with D?
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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26 Sep 2009, 06:29
yeah really nice Question very close call between D&E
definitely would choose the wrong option in the exam

E is good but a lot of thinking is required.
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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26 Sep 2009, 07:05
sudeep wrote:
What's wrong with D?

As per the given information, histidine just renders the metals inert and does not reduce the concentration of metals in soil. And even if it does, why do we care? We just want to know if the histidine helps the plant to grow. And choice D does not tell us that. So we can get rid of D.

Please let me know if you want me to explain further.
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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26 Sep 2009, 09:22
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hgp2k wrote:
sudeep wrote:
What's wrong with D?

As per the given information, histidine just renders the metals inert and does not reduce the concentration of metals in soil. And even if it does, why do we care? We just want to know if the histidine helps the plant to grow. And choice D does not tell us that. So we can get rid of D.

Please let me know if you want me to explain further.

My Reasoning:

Premises:

Other plants can't grow ==> because of high concentration toxic metals in the soil.

Herb can grow ==> in the soil with high concentration toxic metal.

Herb ==> produces amino acids (histidine) ==> make metals inert

Conclusion: Possibly, therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils.

We need to support the conclusion

E says that at maturity histidine concentration declines

1)note : Concentration declines, not "zero"==> they still have histidine but not growing

2) it doesn't prove that histidine is the (only, as implied in the conclusion) reason for the growth, as there is no comparison made with other reasons. It doesn't use the premises of the metal inertness which is used for the hypothesis.

----
D says that "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"

As other plants to which metals are toxic are able to grow in the soil after cultivation of the herb ==>(implies) soil has metals that are inert and non-toxic ==>(implies) histidine is the reason of the inertness of the metal==>(implies) histadine is the only reason for the growth of the herbs.

Last conclusion is the result of the comparison of the herb's ability and inability of other plants, which are toxic to metals, to grow in toxic soil.

We need comparison:

Other plant's can't grow, but herbs can. Why? hestadine makes the metal inert and is the reason for the growth of the herbs.
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26 Sep 2009, 09:48
Thanx for the explanation!
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Re: A certain cultivated herb is one of a group of closely [#permalink]

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28 Sep 2009, 23:42
I selected A, but OA is E...
Re: A certain cultivated herb is one of a group of closely   [#permalink] 28 Sep 2009, 23:42

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