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# In parts of South America, vitamin-A deficiency is a serious

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In parts of South America, vitamin-A deficiency is a serious [#permalink]

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09 Aug 2012, 02:08
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In parts of South America, vitamin-A deficiency is a serious health problem, especially among children. In one region, agriculturists hope to improve nutrition by encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in betacarotene, which the body converts into vitamin A. The plan has good chances of success, since sweet potato is a staple of the region's diet and agriculture, and the varieties currently grown contain little beta-carotene.
Which of the following, if true, most strongly supports the prediction that the plan will succeed?
A. There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do.
B. The flesh of SPK004 differs from that of the currently cultivated sweet potatoes in colors and textures, so traditional foods would look somewhat different when prepared from SPK004.
C. For successful cultivation of SPK004, a soil significantly richer in nitrogen is needed than is needed for the varieties of sweet potato currently cultivated in the region.
D. There are no other varieties of sweet potato that are significantly richer in beta-carotene than SPK004 is.
E. The currently cultivated varieties of sweet potato contain no important nutrients that SPK004 lacks.
[Reveal] Spoiler: OA
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Re: GMATPrep CR : need explanation :) [#permalink]

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09 Aug 2012, 15:18
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naruphanp wrote:
In parts of South America, vitamin-A deficiency is a serious health problem, especially among children. In one region, agriculturists hope to improve nutrition by encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in betacarotene, which the body converts into vitamin A. The plan has good chances of success, since sweet potato is a staple of the region's diet and agriculture, and the varieties currently grown contain little beta-carotene.
Which of the following, if true, most strongly supports the prediction that the plan will succeed?
A. There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do.
B. The flesh of SPK004 differs from that of the currently cultivated sweet potatoes in colors and textures, so traditional foods would look somewhat different when prepared from SPK004.
C. For successful cultivation of SPK004, a soil significantly richer in nitrogen is needed than is needed for the varieties of sweet potato currently cultivated in the region.
D. There are no other varieties of sweet potato that are significantly richer in beta-carotene than SPK004 is.
E. The currently cultivated varieties of sweet potato contain no important nutrients that SPK004 lacks.

Hi, there. I'm happy to help with this.

In the prompt:
Sentence #1 frames the situation and states the problem that needs to be resolved --- a vitamin-A deficiency
Sentence #2 presents a plan designed to solve the problem. Th
Sentence #3 present some support for the plan.

The plan's success depends on assumptions, such as:
a) the SPK004 sweet potato will grow successfully there
b) the folks there will be willing to plant & eat the SPK004 sweet potato instead of their traditional sweet potatoes.
c) nutritionally, nothing else would be lost in a switch from traditional sweet potatoes to the SPK004 sweet potato

OK, so we want answer that will strengthen the argument. Often on the GMAT CR, if the question is asking you to strengthen the argument, two or three of the incorrect answers will be weakeners. Conversely, when the CR asks you to weaken the argument, two or three of the incorrect answers will strengthen the argument. Always be on the lookout for incorrect answers that do the opposite of what you were asked to do. Let's look at these answer choices.

A. There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do.
Well, if there are other vegetables currently grown that have more beta-carotene, then it would seem the folks there are already getting enough beta-carotene, and for some reason, they are not properly converting it to vitamin-A. It's unclear what the problem would be, but certainly adding a new sweet potato with more beta-carotene wouldn't necessarily solve anything. The plan will not solve the problem. This answer is a weakener, so it's incorrect.

B. The flesh of SPK004 differs from that of the currently cultivated sweet potatoes in colors and textures, so traditional foods would look somewhat different when prepared from SPK004.
When food is different looking --- especially different in both color and texture --- it can be hard to get folks set in their ways to try it. If a large proportion of the folks in these places either decide not to try the new sweet potato or try it and decide they don't like it, then many people will not eat it and will not get the benefit of the beta-carotene, and thus the vitamin-A deficiency will continue. The plan will not solve the problem. This answer is a weakener, so it's incorrect.

C. For successful cultivation of SPK004, a soil significantly richer in nitrogen is needed than is needed for the varieties of sweet potato currently cultivated in the region.
Hmmm. If the SPK004 sweet potato needs soil much richer in nitrogen, it sounds as if it's at least possible that it won't grow particularly well in these environments. If the farmers there can't grow it well or at all, then it won't replace the traditional sweet potatoes, and no one will benefit. The plan will not solve the problem. This answer is a weakener, so it's incorrect.

D. There are no other varieties of sweet potato that are significantly richer in beta-carotene than SPK004 is.
This is a particularly interesting one. We already can infer that the SPK004 sweet potato has more beta-carotene than the the traditional sweet potatoes in this region. That's the comparison that is meaningful in this argument. This answer choice provides the added information --- the SPK004 sweet potato also contains more beta-carotene than any other variety of sweet potato anywhere else --- China, Uganda, New Zealand, Alabama, etc. Well, that's interesting, but it's not particularly relevant. We already know the important comparison ---- the SPK004 sweet potato vs. sweet potatoes traditionally grown in these parts of South America. That's the part that is pertinent to the argument. The fact that the SPK004 sweet potato also contains more beta-carotene than any other variety of sweet potato in other places --- strictly speaking, this is irrelevant to the argument. Therefore, it is not a strengthener. This answer is incorrect.

E. The currently cultivated varieties of sweet potato contain no important nutrients that SPK004 lacks.
Well, we have just nuked the first four answers, so we hope this one works! Fortunately, this is almost identical to assumption (c) above. So, in switching from the traditional sweet potatoes to the SPK004 sweet potato, these folks will gain beta-carotene and will not lose anything other nutrient. This is a strengthener --- in fact, it's one of the assumptions on which the plan is based.
If we were to deny this and assert the opposite of (E) --- in switching from the traditional sweet potatoes to the SPK004 sweet potato, these folks would beta-carotene but lose some other important nutrient --- then, that would weaken the argument, because it seems like the plan would just replace one problem (a vitamin-A deficiency) with another problem (a deficiency of some other nutrient). Denying (E) weakens the argument, which is further evidence that it's a strengthener.
For all these reasons, (E) is the best answer.

Notice that one strategy that helped significantly in the analysis of this question was finding assumptions before we approached the answer choices. That won't always work, but it works enough that it's a useful strategy. See this post for more on that strategy.

Does all this make sense? Please let me know if you have any further questions.

Mike
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Re: GMATPrep CR : need explanation :) [#permalink]

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13 Aug 2012, 09:09
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crackHSW wrote:
Although its not an assumption question , its a strengthen question and the technique mentioned in Powerscore CR bible is for assumption questions only, I am wondering how come the technique works here

GMAT prep sources will talk about types of CR like the "assumption question" and the "strengthen question" in order to elucidate the different possibilities, but do not make the mistake of reifying those differences. On the real GMAT, everything is much more fluid. Knowing how to identify an assumption of an argument is most relevant on an "assumption question", but a choice that affirms an assumption could be a good "strengthener", and a choice that attacked an assumption could be a good weakener. Nothing about the CR on the real GMAT is formulaic, and therefore any rigidity in your approach will be punished. The critical thinking that the CR demands is highly flexible and highly contextual. Learn all the strategies, but don't get locked into the myopic view --- "I can only use this strategy on this question type."

Here's a blog post you may find relevant in this regard
http://magoosh.com/gmat/2012/arguments- ... -the-gmat/

Does all this make sense? Let me know if you have any further questions.

Mike
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Re: vitamin-A deficiency [#permalink]

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22 Jul 2013, 13:16
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mavin83 wrote:
gurpreet07 wrote:
In parts of South America, vitamin-A deficiency is a serious health problem, especially among children. In one region, agriculturists are attempting to improve nutrition by encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in beta-carotene, which the body converts into vitamin A. The plan has good chances of success, since sweet potato is a staple of the region’s diet and agriculture, and the varieties currently grown contain little beta-carotene.

Which of the following, if true, most strongly supports the prediction that the plan will succeed?

A. The growing conditions required by the varieties of sweet potato currently cultivated in the region are conditions in which SPK004 can flourish.
B. The flesh of SPK004 differs from that of the currently cultivated sweet potatoes in color and texture, so traditional foods would look somewhat different when prepared from SPK004.
C. There are no other varieties of sweet potato that are significantly richer in beta-carotene than SPK004 is.
D. The varieties of sweet potato currently cultivated in the region contain some important nutrients that are lacking in SPK004.
E. There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do

Source GMAT SET1 verbal

Clear A...
the argument mentions that "agriculturists are attempting to improve nutrition by encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in beta-carotene". so if the growing required by the sweet potato (SPK004) is present in that region, then clearly the aagriculturists plan would succeed.

Thus A best supports the argument..

C is clearly out of scope, as we are only talking about Sweet potato (SPK004)

The passage is not "only talking about sweet potato. It is talking about variety ofsweet potatoes (SPK004 or any other).

The question to answer here is, if there are other varieties of sweet potato that are richer in beta-carotene. Then why people are not having that other variety.
& what is the guarantee that people who are not having 1 variety of sweet potato will have SPK004 (which is another variety of sweet potato).

Although I know OA is A. But, if C is not true how will the above statement ensure the plan will succeed.

Moreover, the statement in A is implied from the below statement in the passage.

since sweet potato is a staple of the region’s diet and agriculture

The questions is "Which of the following, if true, most strongly supports the prediction that the plan will succeed?". If A is not true then the plan will definitely fail. The plan is to successfully plant, harvest, & sell the new variety of sweet potato. The new potato variety does not have to be the best, it just needs to sell. Take for example the Apple...which is currently successful at selling Iphones. Is Iphones the best product out there? Maybe or Maybe not, but apple's plan is to sell the phones and make a profit. Are they doing so? Yes.

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Re: GMATPrep CR : need explanation :) [#permalink]

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10 Aug 2012, 07:18
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CR bible says if confused b/w two choices on assumption ques use assumption negation technique . .here only one was contender just negate it and check if it weakens . yes E when negated does weaken so it is answer.
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Re: GMATPrep CR : need explanation :) [#permalink]

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12 Aug 2012, 00:31
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PUNEETSCHDV wrote:
CR bible says if confused b/w two choices on assumption ques use assumption negation technique . .here only one was contender just negate it and check if it weakens . yes E when negated does weaken so it is answer.

Although its not an assumption question , its a strengthen question and the technique mentioned in Powerscore CR bible is for assumption questions only, I am wondering how come the technique works here
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In parts of South America, vitamin-A deficiency is a serious [#permalink]

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22 Jul 2013, 08:42
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In parts of South America, vitamin-A deficiency is a serious health problem, especially among children. In one region, agriculturists hope to improve nutrition by encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in betacarotene, which the body converts into vitamin A. The plan has good chances of success, since sweet potato is a staple of the region's diet and agriculture, and the varieties currently grown contain little beta-carotene.

which of the following, if true, most strongly supports the prediction that the plan will succeed?

a. There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do.
b. The flesh of SPK004 differs from that of the currently cultivated sweet potatoes in colors and textures, so traditional foods would look somewhat different when prepared from SPK004.
c. For successful cultivation of SPK004, a soil significantly richer in nitrogen is needed than is needed for the varieties of sweet potato currently cultivated in the region.
d. There are no other varieties of sweet potato that are significantly richer in beta-carotene than SPK004 is.
e. the currently cultivated varieties of sweet potato contain no important nutrients that SPK004 lacks.

So I'm curious between option D and E what's the difference? Please explain. Thanks!
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Last edited by dentobizz on 05 Oct 2013, 16:16, edited 2 times in total.
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Re: In parts of South America, vitamin-A deficiency is a seriou [#permalink]

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22 Jul 2013, 09:09
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fozzzy wrote:
In parts of South America, vitamin-A deficiency is a serious health problem, especially among children. In one region, agriculturists hope to improve nutrition by encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in betacarotene, which the body converts into vitamin A. The plan has good chances of success, since sweet potato is a staple of the region's diet and agriculture, and the varieties currently grown contain little beta-carotene.

which of the following, if true, most strongly supports the prediction that the plan will succeed?

a. There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do. Weakens the argument as there would be no need to introduce a variety of SP that increases Vit. A.
b. The flesh of SPK004 differs from that of the currently cultivated sweet potatoes in colors and textures, so traditional foods would look somewhat different when prepared from SPK004. Weakens the prediction.
c. For successful cultivation of SPK004, a soil significantly richer in nitrogen is needed than is needed for the varieties of sweet potato currently cultivated in the region. Weakens the prediction.
d. There are no other varieties of sweet potato that are significantly richer in beta-carotene than SPK004 is. This does not mean that SPK004 is not a good choice to increase Vit. A in the local children. Just that a better choice might exist.
e. the currently cultivated varieties of sweet potato contain no important nutrients that SPK004 lacks. If SPK004 lacked other nutrients available in current SPs eaten locally, then another nutritional problem would potentially be created. Basically by solving one problem, you would create another problem.

[Reveal] Spoiler:
So I'm curious between option D and E what's the difference? Please explain. Thanks!

D = Does not mean this variety is not a good choice.
E = One problem exchanged for another problem.
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Re: In parts of South America, vitamin-A deficiency is a serious [#permalink]

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24 Mar 2016, 16:15
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megha_2709 wrote:
Hi,

Thanks for posting such good explanation however I still have some doubt regarding answer choice A which states "There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do". This shows that although there are other varieties that contain more beta carotene , since they are not staple food , they are not consumed in enough quantity by the people living there ,so only by making changes to staple food ,we can cure the Vit A deficiency, hence all the more reason to cultivate a new variety of sweet potato which is the staple food of that region. I have use the above stated logic while selecting this answer choice, please help me understand why this is incorrect, will really appreciate your help.

Thanks
Megha

Dear Megha,
I'm happy to respond.

In this CR problem, we are looking for for a strengthener. This means, we want something that, by itself, would strengthen the argument, not a statement that would be consistent with something else strengthening the argument.

A. There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do.
Are these other vegetables also staple foods? We don't know.
Do the folks in these regions know about and eat these other vegetables? We don't know.

IF these folks in these parts of South America do know about and eat these other vegetables, then it means they are getting more than enough beta carotene already, and for some genetic reasons, their bodies are not properly converting it to vitamin A. That's a very big problem! Bringing in some new sweet potato that's also high in beta carotene will not even begin to address this serious genetic issue. In this case, the statement would be a big weakener.

IF these folks in these parts of South America do not know about and eat these other vegetables, then they are not getting beta carotene from those even though theoretically they could. Would encourage the folks there to eat these native vegetables be a better idea than introducing a new sweet potato? That's unclear. In this case, whether these other vegetables were present or not doesn't seem to impact the agriculturists' plan at all.

Notice that, in the second case, it certainly could be possible that the agriculturists' plan might work, but there's nothing here that is strengthening the idea that it would work. Being consistent with the success of the plan is not the same as strengthening the argument for the plan.

I think you are assuming that the agriculturists' plan in the prompt argument is definitely going to work. You can't simply assume that. It seems like a promising plan, but there are dozens of factors that could make it not work. We don't know. In GMAT CR, we have to question everything! Given that this argument is fragile, not necessarily a sure thing, then (A) provides absolutely no information that makes it more of a sure thing. One potential problem that could derail the plan would be if (E) were false, so knowing that (E) is true definitively fixes one potential problem. By contrast, if (A) were false, it would make very little difference to the argument: it certainly would not be a problem.

Does all this make sense?
Mike
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Re: In parts of South America, vitamin-A deficiency is a serious [#permalink]

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22 Jul 2013, 22:19
Thw two questions merged in this thread are different. I posted a different question this one is from OG... The one I posted is from gmat prep screen shot below
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Re: In parts of South America, vitamin-A deficiency is a serious [#permalink]

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30 Jul 2014, 06:33
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Re: In parts of South America, vitamin-A deficiency is a serious [#permalink]

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22 Aug 2015, 09:22
Objection: The natives won't like the taste of the SPK004
WARNING: Conclusion is that SPK004 will improve NUTRITION; NUTRITION is not limited to BC (Beta-Carotene)

E: Correct; shows that SPK004, although good in BC, is not deficient in other nutrients
D: Wrong; this doesn't matter; we just care if the varieties have ENOUGH beta-carotene
C: Wrong; weakens
B: Wrong; weakens (related to my objection)
A: Wrong; other vegetables are irrelevant
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Re: In parts of South America, vitamin-A deficiency is a serious [#permalink]

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24 Mar 2016, 10:25
mikemcgarry wrote:
naruphanp wrote:
In parts of South America, vitamin-A deficiency is a serious health problem, especially among children. In one region, agriculturists hope to improve nutrition by encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in betacarotene, which the body converts into vitamin A. The plan has good chances of success, since sweet potato is a staple of the region's diet and agriculture, and the varieties currently grown contain little beta-carotene.
Which of the following, if true, most strongly supports the prediction that the plan will succeed?
A. There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do.
B. The flesh of SPK004 differs from that of the currently cultivated sweet potatoes in colors and textures, so traditional foods would look somewhat different when prepared from SPK004.
C. For successful cultivation of SPK004, a soil significantly richer in nitrogen is needed than is needed for the varieties of sweet potato currently cultivated in the region.
D. There are no other varieties of sweet potato that are significantly richer in beta-carotene than SPK004 is.
E. The currently cultivated varieties of sweet potato contain no important nutrients that SPK004 lacks.

Hi, there. I'm happy to help with this.

In the prompt:
Sentence #1 frames the situation and states the problem that needs to be resolved --- a vitamin-A deficiency
Sentence #2 presents a plan designed to solve the problem. Th
Sentence #3 present some support for the plan.

The plan's success depends on assumptions, such as:
a) the SPK004 sweet potato will grow successfully there
b) the folks there will be willing to plant & eat the SPK004 sweet potato instead of their traditional sweet potatoes.
c) nutritionally, nothing else would be lost in a switch from traditional sweet potatoes to the SPK004 sweet potato

OK, so we want answer that will strengthen the argument. Often on the GMAT CR, if the question is asking you to strengthen the argument, two or three of the incorrect answers will be weakeners. Conversely, when the CR asks you to weaken the argument, two or three of the incorrect answers will strengthen the argument. Always be on the lookout for incorrect answers that do the opposite of what you were asked to do. Let's look at these answer choices.

A. There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do.
Well, if there are other vegetables currently grown that have more beta-carotene, then it would seem the folks there are already getting enough beta-carotene, and for some reason, they are not properly converting it to vitamin-A. It's unclear what the problem would be, but certainly adding a new sweet potato with more beta-carotene wouldn't necessarily solve anything. The plan will not solve the problem. This answer is a weakener, so it's incorrect.

B. The flesh of SPK004 differs from that of the currently cultivated sweet potatoes in colors and textures, so traditional foods would look somewhat different when prepared from SPK004.
When food is different looking --- especially different in both color and texture --- it can be hard to get folks set in their ways to try it. If a large proportion of the folks in these places either decide not to try the new sweet potato or try it and decide they don't like it, then many people will not eat it and will not get the benefit of the beta-carotene, and thus the vitamin-A deficiency will continue. The plan will not solve the problem. This answer is a weakener, so it's incorrect.

C. For successful cultivation of SPK004, a soil significantly richer in nitrogen is needed than is needed for the varieties of sweet potato currently cultivated in the region.
Hmmm. If the SPK004 sweet potato needs soil much richer in nitrogen, it sounds as if it's at least possible that it won't grow particularly well in these environments. If the farmers there can't grow it well or at all, then it won't replace the traditional sweet potatoes, and no one will benefit. The plan will not solve the problem. This answer is a weakener, so it's incorrect.

D. There are no other varieties of sweet potato that are significantly richer in beta-carotene than SPK004 is.
This is a particularly interesting one. We already can infer that the SPK004 sweet potato has more beta-carotene than the the traditional sweet potatoes in this region. That's the comparison that is meaningful in this argument. This answer choice provides the added information --- the SPK004 sweet potato also contains more beta-carotene than any other variety of sweet potato anywhere else --- China, Uganda, New Zealand, Alabama, etc. Well, that's interesting, but it's not particularly relevant. We already know the important comparison ---- the SPK004 sweet potato vs. sweet potatoes traditionally grown in these parts of South America. That's the part that is pertinent to the argument. The fact that the SPK004 sweet potato also contains more beta-carotene than any other variety of sweet potato in other places --- strictly speaking, this is irrelevant to the argument. Therefore, it is not a strengthener. This answer is incorrect.

E. The currently cultivated varieties of sweet potato contain no important nutrients that SPK004 lacks.
Well, we have just nuked the first four answers, so we hope this one works! Fortunately, this is almost identical to assumption (c) above. So, in switching from the traditional sweet potatoes to the SPK004 sweet potato, these folks will gain beta-carotene and will not lose anything other nutrient. This is a strengthener --- in fact, it's one of the assumptions on which the plan is based.
If we were to deny this and assert the opposite of (E) --- in switching from the traditional sweet potatoes to the SPK004 sweet potato, these folks would beta-carotene but lose some other important nutrient --- then, that would weaken the argument, because it seems like the plan would just replace one problem (a vitamin-A deficiency) with another problem (a deficiency of some other nutrient). Denying (E) weakens the argument, which is further evidence that it's a strengthener.
For all these reasons, (E) is the best answer.

Notice that one strategy that helped significantly in the analysis of this question was finding assumptions before we approached the answer choices. That won't always work, but it works enough that it's a useful strategy. See this post for more on that strategy.

Does all this make sense? Please let me know if you have any further questions.

Mike

Hi,

Thanks for posting such good explanation however I still have some doubt regarding answer choice A which states "There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do". This shows that although there are other varieties that contain more beta carotene , since they are not staple food , they are not consumed in enough quantity by the people living there ,so only by making changes to staple food ,we can cure the Vit A deficiency, hence all the more reason to cultivate a new variety of sweet potato which is the staple food of that region. I have use the above stated logic while selecting this answer choice, please help me understand why this is incorrect, will really appreciate your help.

Thanks
Megha
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Re: In parts of South America, vitamin-A deficiency is a serious [#permalink]

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25 Mar 2016, 04:19
mikemcgarry wrote:
megha_2709 wrote:
Hi,

Thanks for posting such good explanation however I still have some doubt regarding answer choice A which states "There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do". This shows that although there are other varieties that contain more beta carotene , since they are not staple food , they are not consumed in enough quantity by the people living there ,so only by making changes to staple food ,we can cure the Vit A deficiency, hence all the more reason to cultivate a new variety of sweet potato which is the staple food of that region. I have use the above stated logic while selecting this answer choice, please help me understand why this is incorrect, will really appreciate your help.

Thanks
Megha

Dear Megha,
I'm happy to respond.

In this CR problem, we are looking for for a strengthener. This means, we want something that, by itself, would strengthen the argument, not a statement that would be consistent with something else strengthening the argument.

A. There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do.
Are these other vegetables also staple foods? We don't know.
Do the folks in these regions know about and eat these other vegetables? We don't know.

IF these folks in these parts of South America do know about and eat these other vegetables, then it means they are getting more than enough beta carotene already, and for some genetic reasons, their bodies are not properly converting it to vitamin A. That's a very big problem! Bringing in some new sweet potato that's also high in beta carotene will not even begin to address this serious genetic issue. In this case, the statement would be a big weakener.

IF these folks in these parts of South America do not know about and eat these other vegetables, then they are not getting beta carotene from those even though theoretically they could. Would encourage the folks there to eat these native vegetables be a better idea than introducing a new sweet potato? That's unclear. In this case, whether these other vegetables were present or not doesn't seem to impact the agriculturists' plan at all.

Notice that, in the second case, it certainly could be possible that the agriculturists' plan might work, but there's nothing here that is strengthening the idea that it would work. Being consistent with the success of the plan is not the same as strengthening the argument for the plan.

I think you are assuming that the agriculturists' plan in the prompt argument is definitely going to work. You can't simply assume that. It seems like a promising plan, but there are dozens of factors that could make it not work. We don't know. In GMAT CR, we have to question everything! Given that this argument is fragile, not necessarily a sure thing, then (A) provides absolutely no information that makes it more of a sure thing. One potential problem that could derail the plan would be if (E) were false, so knowing that (E) is true definitively fixes one potential problem. By contrast, if (A) were false, it would make very little difference to the argument: it certainly would not be a problem.

Does all this make sense?
Mike

Thank you so so much , its clear as crystal now . I made some very strong assumptions there while selecting A ,overlooked and discarded option E. Your explanation is very helpful in clearing all the doubts I had. Thanks again !!!

Regards
Megha
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Re: In parts of South America, vitamin-A deficiency is a serious [#permalink]

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25 Mar 2016, 06:57
In parts of South America, vitamin-A deficiency is a serious health problem, especially among children. In one region, agriculturists hope to improve nutrition by encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in betacarotene, which the body converts into vitamin A. The plan has good chances of success, since sweet potato is a staple of the region's diet and agriculture, and the varieties currently grown contain little beta-carotene.

Plan: encourage farmers to plant a new variety of sweet potato called SPK004 that is rich in betacarotene, which the body converts into vitamin A. sweet potato is a staple of the region's diet and agriculture, and the varieties currently grown contain little beta-carotene.
Conclusion: Plan has good chances of success.

We need to support the conclusion. There are several assumptions we can draw. First, SPK004 will thrive in region. Second may be that current there is no deficiency in the bodies of children that inhibits the conversion of betacarotene to vit -A.

Lets do POE.

A. There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do.
We need to support the plan involving this new variety of sweet potato. So an alternate plan cannot be used to support this plan. Eliminate.

B. The flesh of SPK004 differs from that of the currently cultivated sweet potatoes in colors and textures, so traditional foods would look somewhat different when prepared from SPK004.

This option is either irrevellant or weakens in case different color and texture may discourage ppl from eating this variety but we certainly need more information to justify that. Eliminate.

C. For successful cultivation of SPK004, a soil significantly richer in nitrogen is needed than is needed for the varieties of sweet potato currently cultivated in the region.

This will weaken as the soil significantly richer than nitrogen is needed.

D. There are no other varieties of sweet potato that are significantly richer in beta-carotene than SPK004 is.

Again, an alternate plan doesn't help in supporting the plan under evaluation.

E. The currently cultivated varieties of sweet potato contain no important nutrients that SPK004 lacks.

This will support the plan as it strengthens the case for the substitution of old variety with new variety.

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Re: In parts of South America, vitamin-A deficiency is a serious   [#permalink] 25 Mar 2016, 06:57
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