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Rhizobium bacteria living in the roots of bean plants or

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Rhizobium bacteria living in the roots of bean plants or [#permalink] New post 15 Dec 2003, 13:49
00:00
A
B
C
D
E

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  5% (low)

Question Stats:

33% (01:59) correct 66% (01:40) wrong based on 36 sessions
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.

Answers with explanation pls.

Last edited by asandeep on 16 Dec 2003, 08:22, edited 1 time in total.
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Re: CR - Rhizobium [#permalink] New post 15 Dec 2003, 22:55
asandeep wrote:
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.

Answers with explanation pls.



B is best.

if there are other nutrients to be supplied , just having fixed nitrogen
will not reduce need for fertilizers. We still would have to use the artificial fertilizer.
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 [#permalink] New post 16 Dec 2003, 02:27
B or E. tough call... i wud choose E. B , to me, sounds very strong.
official ans??
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 [#permalink] New post 16 Dec 2003, 03:25
mbamantra wrote:
B or E. tough call... i wud choose E. B , to me, sounds very strong.
official ans??


ya, E is tempting.

but note , the author adds an "IF" to the conclusion.

so he is not assuming E...he has already mentioned E in the passage.

thanks
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 [#permalink] New post 16 Dec 2003, 06:40
Official ans : E

B was too tempting to resist :cry:
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 [#permalink] New post 16 Dec 2003, 10:15
I chose E for my answer.

Can we say that B is the answer for the conclusion rather than for the argument?

By conclusion, I mean "If biotechnology succeeds in doing so, the need for artificial fertilizers would decrease"
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 [#permalink] New post 17 Dec 2003, 00:34
I believe the word "decrease", makes B a bit weaker than E.
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 [#permalink] New post 19 Dec 2003, 00:26
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An assumption is verified best via its negation. The converse of E perfectly destoys the conclusion.
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Re: CR - Rhizobium [#permalink] New post 07 May 2011, 10:08
i prephrased it to E but then felt B was also weakening the conclusion.
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Re: CR - Rhizobium [#permalink] New post 26 May 2011, 00:58
The argument circles around R bacteria.If bacteria themselves do not produce Fixed nitrogen then there is not point in developing the strains.

E is the best choice of the lot.
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Re: CR - Rhizobium [#permalink] New post 29 May 2011, 07:55
E is the answer, B cannot be because even if blabla is not the only soil, then the use of artificial fertilizar could still be reduced because you do not need any for blabla.
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Re: CR - Rhizobium [#permalink] New post 31 May 2011, 03:32
E since negation destroys the argument. B didn't go with B because the argument states artificial fertilizers need only be reduced, not completely eliminated.
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Re: CR - Rhizobium [#permalink] New post 31 May 2011, 08:53
+1 E
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Re: CR - Rhizobium [#permalink] New post 31 May 2011, 13:39
I thought wrong and gave B.
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Re: CR - Rhizobium [#permalink] New post 31 May 2011, 17:58
Interesting
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Re: CR - Rhizobium [#permalink] New post 03 Jun 2011, 00:16
I don't know, I think I am mastering the CR section with ease. Got this one also right. With this answer, my rally is 15 (one single streak :)
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Re: CR - Rhizobium [#permalink] New post 03 Jun 2011, 17:21
The conclusion states that the need for artificial fertilizers will be reduced, not eliminated. So this leaves the possibility that there are other nutrients that still need to be supplied, so B) is not a necessary premise.

The purpose of having the bacteria in the roots of wheat is to produce nitrogen for the plant, so the stimulus is assuming that if biotechnology succeeds to have the bacteria in the wheat roots, the bacteria will work in the same way as in the roots of legumes and produce nitrogen. E) is the correct answer.
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Re: CR - Rhizobium [#permalink] New post 05 Jun 2011, 07:00
Chose B but E fails under negation rule! Good one!
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Re: CR - Rhizobium [#permalink] New post 13 Jul 2011, 07:23
E. Also, it may look like E is stated in the text so it cant be an assumption but E is *not* stated in the text. The premise says that R. Bacteria produces fixed nitrogen, not that R bacteria attached to wheat strain hosts will be able to produce fixed nitrogen.
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Re: CR - Rhizobium   [#permalink] 13 Jul 2011, 07:23
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