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Man_of_Honour · 06-03-2008, 03:38 AM

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

LoyalWater · 06-03-2008, 11:38 AM

A makes the most sense after going through all of them and following the process of elimination.

KillGmat · 06-03-2008, 06:55 PM

C it is.

takeongmat · 06-03-2008, 07:49 PM

The hypothesis is "The herb’s high histidine production is what allows it to grow in metal-rich soils".
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. This first sentence says that the whole group grows in the toxic soil. so the hypothesis can be supported only by giving a reason which is applicable not only on herb but also on other closely related plants.
Answer C "others of the closely related group of plants are also found to produce histidine in large quantities" supports the hypothesis in this way.

LoyalWater · 06-04-2008, 10:11 AM

I was going through the good_cr1 doc and it seems like the OA for this one is D ?????????????????? WTF

Man_of_Honour · 06-04-2008, 05:19 PM

Guys , i also marked 'C' ,,, just to find that the OA is 'E' .
I think the reasoning behind it is , since during the early stages it wud require high concentrations of histidine and when it gains maturity similar levels are not required . it proves the point that production of hidistine is essential for the growth in metal rich soil .this proves the hypothesis

CACERJ01 · 06-04-2008, 05:40 PM

Hi guys,

For me is Answer C. I think that this question is looking for a support or a reason for herb’s high histidine production allows it to grow in metal-rich soils. Here is my reasoning:

A. Out scope. The fact that histidine is found in all parts of the plant does not ensure the growth of the plant.
B. Too narrow. The relation between herb’s high level of histidine production and low level of production of other amino acids does not mean anything.
C. OK. It is related to the herb’s histidine production. Since the histidine helps herb to growth, the histiden production of others of the closely related group of plants -plants similar to the herb- would help the growth too.
D. Maybe. But I the phrase "over an extended period" makes me doubt. Also, the text does not mention anything about the growth of the plants to which the metals are toxic.
E. Out of scope. The decline of the concentration of histidine does not mean focuss on the question.

I hope this helps you. Feel free to let me know if I am not right.
Cheers.

KillGmat · 06-05-2008, 08:06 AM

Quote:

Originally Posted by LoyalWater

I was going through the good_cr1 doc and it seems like the OA for this one is D ?????????????????? WTF

OAs are not always correct. The answer for this CR is C. I think this question has been discussed many times in the past. Search the forum.

borntorun · 06-06-2008, 12:28 PM

IMO E ...
argument based on cause --effect

Histadine causes plant to survive .... no histadine , plant doesn't survive .. option E says this ...

buskool · 06-10-2008, 07:21 AM

IMO C.

the findings should be consistent for all the plants of the closely related group. Otherwise, we may conclude,the hypothesis may have missed out on some other amino acids/chemical that makes the survival of these plants in areas of metallic toxics.

06-03-2008, 03:38 AM	#1 (permalink)
Man_of_Honour Trying to make mom and pop proud Join Date: Mar 2008 Posts: 27	GMAT Set 28 CR 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

06-04-2008, 05:40 PM	#7 (permalink)
CACERJ01 Within my grasp! Join Date: May 2007 Location: Lima, Peru Posts: 123	Hi guys, For me is Answer C. I think that this question is looking for a support or a reason for herb’s high histidine production allows it to grow in metal-rich soils. Here is my reasoning: A. Out scope. The fact that histidine is found in all parts of the plant does not ensure the growth of the plant. B. Too narrow. The relation between herb’s high level of histidine production and low level of production of other amino acids does not mean anything. C. OK. It is related to the herb’s histidine production. Since the histidine helps herb to growth, the histiden production of others of the closely related group of plants -plants similar to the herb- would help the growth too. D. Maybe. But I the phrase "over an extended period" makes me doubt. Also, the text does not mention anything about the growth of the plants to which the metals are toxic. E. Out of scope. The decline of the concentration of histidine does not mean focuss on the question. I hope this helps you. Feel free to let me know if I am not right. Cheers. Last edited by CACERJ01 : 06-04-2008 at 05:59 PM.

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06-03-2008, 11:38 AM	#2 (permalink)
LoyalWater Trying to make mom and pop proud Join Date: Jun 2008 Posts: 15	A makes the most sense after going through all of them and following the process of elimination.

06-03-2008, 06:55 PM	#3 (permalink)
KillGmat TestMagic Guru-in-Training Join Date: Jan 2008 Posts: 663	C it is.

06-03-2008, 07:49 PM	#4 (permalink)
takeongmat Trying to make mom and pop proud Join Date: May 2008 Posts: 11	The hypothesis is "The herb’s high histidine production is what allows it to grow in metal-rich soils". 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. This first sentence says that the whole group grows in the toxic soil. so the hypothesis can be supported only by giving a reason which is applicable not only on herb but also on other closely related plants. Answer C "others of the closely related group of plants are also found to produce histidine in large quantities" supports the hypothesis in this way.

06-04-2008, 10:11 AM	#5 (permalink)
LoyalWater Trying to make mom and pop proud Join Date: Jun 2008 Posts: 15	I was going through the good_cr1 doc and it seems like the OA for this one is D ?????????????????? WTF

06-04-2008, 05:19 PM	#6 (permalink)
Man_of_Honour Trying to make mom and pop proud Join Date: Mar 2008 Posts: 27	Guys , i also marked 'C' ,,, just to find that the OA is 'E' . I think the reasoning behind it is , since during the early stages it wud require high concentrations of histidine and when it gains maturity similar levels are not required . it proves the point that production of hidistine is essential for the growth in metal rich soil .this proves the hypothesis

06-06-2008, 12:28 PM	#9 (permalink)
borntorun Within my grasp! Join Date: May 2008 Posts: 384	IMO E ... argument based on cause --effect Histadine causes plant to survive .... no histadine , plant doesn't survive .. option E says this ...

06-10-2008, 07:21 AM	#10 (permalink)
buskool Eager! Join Date: Feb 2008 Posts: 79	IMO C. the findings should be consistent for all the plants of the closely related group. Otherwise, we may conclude,the hypothesis may have missed out on some other amino acids/chemical that makes the survival of these plants in areas of metallic toxics.

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