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A certain cultivated herb is one of a group of closely

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Re: A certain cultivated herb is one [#permalink] New post 07 Jan 2011, 07:48
According to my source, OA is D.

Please clarify.
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Re: A certain cultivated herb is one [#permalink] New post 09 Jan 2011, 11:31
I am not sure with this one. I think C is the right answer !
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Re: A certain cultivated herb is one [#permalink] New post 10 Jan 2011, 06:26
Both C and D could work here.
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Re: A certain cultivated herb is one [#permalink] New post 21 Apr 2011, 11:51
This one has not been clarifed yet.
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Re: A certain cultivated herb is one [#permalink] New post 22 Apr 2011, 00:11
what is the source of this Q?
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Re: A certain cultivated herb is one [#permalink] New post 28 Jun 2011, 08:47
Tricky question!....

A case can be made for C, D and E.

On first glance -- C seems to fit. But D makes sense as well -- especially if the Histadine renders the metals inert (which would suggest that other crops can grow as well). A case can be made for E -- given that these plants only need this compound "to grow"....

Would be nice to see the official explanations and source.
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Re: A certain cultivated herb is one [#permalink] New post 28 Jun 2011, 11:37
IMO E

"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."
As per this line It seems histidine renders with these metals chemically, which means the negative effect of these metals on herbs is reduced when they are reacted with histidine.

And Option E: The quantity goes reduces as the plant grows because some quantity of histidine is used in reducing the negative effect of metals. Hence supporting plants growth

Not sure if this is the right explanation :cry:
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Re: A certain cultivated herb is one [#permalink] New post 26 Nov 2013, 18:35
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? :roll:
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?

Hope this explanation is helpful.
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The OA is D. Kindly refrain from posting incorrect OAs. Her's why a-certain-cultivated-herb-is-one-of-a-group-of-closely-40237.html?fl=similar http://www.beatthegmat.com/cultivated-herb-t40992.html http://www.urch.com/forums/gmat-verbal/ ... 28-cr.html

Honestly E is not the contender. It has no reference to toxicity
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Re: A certain cultivated herb is one of a group of closely [#permalink] New post 05 Aug 2014, 03:09
I marked answer as E, but confused to after reading view :(

but later goggled and found answer is E :)

It means that as long as the herb is growing, histidine is high and as the herb approaches MATURITY the concentration of histidine declines.

Hoe that helps
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Re: A certain cultivated herb is one of a group of closely [#permalink] New post 05 Aug 2014, 03:11
mohnish104 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? :roll:
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?

Hope this explanation is helpful.
---------------------------

Consider KUDOS if you found my post helpful :)





The OA is D. Kindly refrain from posting incorrect OAs. Her's why a-certain-cultivated-herb-is-one-of-a-group-of-closely-40237.html?fl=similar http://www.beatthegmat.com/cultivated-herb-t40992.html http://www.urch.com/forums/gmat-verbal/ ... 28-cr.html

Honestly E is not the contender. It has no reference to toxicity


OA can not be D :evil: , it is actually weakening giving another reason for growing as adaptation :)
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Re: A certain cultivated herb is one of a group of closely   [#permalink] 05 Aug 2014, 03:11
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