A certain cultivated herb is one of a group of closely

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Re: A certain cultivated herb is one [#permalink]

07 Jan 2011, 08:48

According to my source, OA is D.

Please clarify.
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Re: A certain cultivated herb is one [#permalink]

09 Jan 2011, 12:31

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]

10 Jan 2011, 07:26

Both C and D could work here.
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Re: A certain cultivated herb is one [#permalink]

21 Apr 2011, 12:51

This one has not been clarifed yet.
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Re: A certain cultivated herb is one [#permalink]

22 Apr 2011, 01:11

what is the source of this Q?

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Re: A certain cultivated herb is one [#permalink]

28 Jun 2011, 09:47

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]

28 Jun 2011, 12:37

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:

Re: A certain cultivated herb is one [#permalink] 28 Jun 2011, 12:37

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A certain cultivated herb is one of a group of closely

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