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Director
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Rhizobium bacteria living in the roots of bean plants or [#permalink]
 23 Apr 2005, 16:51
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Rhizobium bacteria living in the roots of bean plants or other legumes produce fixed nitrogen which is one of the essential plant nutrients and which for non-legume crops, such as wheat normally must be supplied by applications of nitrogen-based fertilizer. So if biotechnology succeeds in producing wheat strains whose roots will play host to Rhizobium bacteria. The need for artificial fertilizers will be reduced.
The argument above makes which one of the following assumptions?
(A) Biotechnology should be directed toward producing plants that do not require artificial fertilizer.
(B) Fixed nitrogen is currently the only soil nutrient that must be supplied by artificial fertilizer for growing wheat crops.
(C) There are no naturally occurring strains of wheat or other grasses that have Rhizobium bacteria living in their roots.
(D) Legumes are currently the only crops that produce their own supply of fixed nitrogen.
(E) Rhizobium bacteria living in the roots of wheat would produce fixed nitrogen.
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VP
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Between B and E, i will go for E because if it is untrue that Rhizobium bacteria living in the roots of wheat would produce fixed nitrogen, then biotechnology is of no use here
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VP
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One more for 'E'
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SVP
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Re: CR: Rhizobium bacteria [#permalink]
23 Apr 2005, 17:27
(E) Rhizobium bacteria living in the roots of wheat would produce fixed nitrogen.
the reason to biotechonoloy is to be developed to achieve this goal. if it is not possible to get nitrogen, there is no use of biotechnology in reducing artificial fertilizer.
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Director
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Definitely between (B) and (E). But, I will go with (B).
Conclusion is: The need for artificial fertilizers will be reduced.
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VP
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jpv wrote: Definitely between (B) and (E). But, I will go with (B).
Conclusion is: The need for artificial fertilizers will be reduced.
I eliminated B becos of the way must be is used 'Fixed nitrogen is currently the only soil nutrient that must be supplied by artificial fertilizer'
This makes it sound like there are other things that are supplied but fixed nitrogen is a must.
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Director
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jpv wrote: Definitely between (B) and (E). But, I will go with (B).
Conclusion is: The need for artificial fertilizers will be reduced.
I would go for E.....The conclusion aligns more towards E...B is a very close bet
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Director
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rthothad wrote: I eliminated B becos of the way must be is used 'Fixed nitrogen is currently the only soil nutrient that must be supplied by artificial fertilizer'
This makes it sound like there are other things that are supplied but fixed nitrogen is a must.
Yeah, E makes sense. Legumes vs Non Legumes. Author assumes what works for Legumes will also work for Non-Legumes. On the other way, B is very strong.
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Director
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OA is E
I chose for B too
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