Zebra mussels, a nuisance when they clog the intake pipes of : GMAT Critical Reasoning (CR)
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# Zebra mussels, a nuisance when they clog the intake pipes of

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Zebra mussels, a nuisance when they clog the intake pipes of [#permalink]

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20 Dec 2010, 06:48
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Zebra mussels, a nuisance when they clog the intake pipes of nuclear power plants and water plants along the Great Lakes, have some redeeming qualities. Since the mussels feed voraciously on algae that they filter from the water that passes by them, bags of zebra mussels suspended in the discharge streams of chemical plants significantly improve water quality, even removing some hazardous waste.

Which one of the following is most strongly supported on the basis of the statements above, if they are true?

(A) Zebra mussels arrived in the Great Lakes on transatlantic freighters and, since they have no natural enemies there, are rapidly displacing the native species of clams.
(B) If the mussels spread to areas of the Mississippi River where native clams provide the basis for a cultured pearl industry, that industry will collapse, since the mussels are unsuitable for such use and would displace the clams.
(C) There is no mechanical means available for clearing intake pipes by scraping the mussels from them.
(D) The algae on which the mussels feed would, if not consumed by the mussels, themselves clog the intake pipes of nuclear power plants and water plants.
(E) Any hazardous waste the mussels remove from chemical-plant discharge will remain in the mussels, if they do not transform it, and they then must be regarded as hazardous waste.
[Reveal] Spoiler: OA

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Re: Zebra mussels, a nuisance when they clog the intake pipes of [#permalink]

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20 Dec 2010, 10:12
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Zebra mussels, a nuisance when they clog the intake pipes of nuclear power plants and water plants along the Great Lakes, have some redeeming qualities. Since the mussels feed voraciously on algae that they filter from the water that passes by them, bags of zebra mussels suspended in the discharge streams of chemical plants significantly improve water quality, even removing some hazardous waste.

Which one of the following is most strongly supported on the basis of the statements above, if they are true?

(A) Zebra mussels arrived in the Great Lakes on transatlantic freighters and, since they have no natural enemies there, are rapidly displacing the native species of clams.
This is not related to the information given in the given set of facts.
(B) If the mussels spread to areas of the Mississippi River where native clams provide the basis for a cultured pearl industry, that industry will collapse, since the mussels are unsuitable for such use and would displace the clams.
This is not related to the information given in the given set of facts.
(C) There is no mechanical means available for clearing intake pipes by scraping the mussels from them.
This is not related to the information given in the given set of facts.(D) The algae on which the mussels feed would, if not consumed by the mussels, themselves clog the intake pipes of nuclear power plants and water plants.
This is not supported by the fact sets given. We are only told that the mussels feed voraciously on algae that they filter from the water that passes by them. We don't know what algae would do if mussels did not eat them.(E) Any hazardous waste the mussels remove from chemical-plant discharge will remain in the mussels, if they do not transform it, and they then must be regarded as hazardous waste.

This must be true since mussels consume hazardous waste. And we are not told that mussels discharge the hazardous waste that they consumed.

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Re: Zebra mussels, a nuisance when they clog the intake pipes of [#permalink]

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21 Dec 2010, 03:51
E is the correct answer. OA Pls ?
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Re: Zebra mussels, a nuisance when they clog the intake pipes of [#permalink]

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03 Feb 2011, 10:34
Zebra mussels, a nuisance when they clog the intake pipes of nuclear power plants and water plants along the Great Lakes, have some redeeming qualities. Since the mussels feed voraciously on algae that they filter from the water that passes by them, bags of zebra mussels suspended in the discharge streams of chemical plants significantly improve water quality, even removing some hazardous waste.

Which one of the following is most strongly supported on the basis of the statements above, if they are true?

(A) Zebra mussels arrived in the Great Lakes on transatlantic freighters and, since they have no natural enemies there, are rapidly displacing the native species of clams.
(B) If the mussels spread to areas of the Mississippi River where native clams provide the basis for a cultured pearl industry, that industry will collapse, since the mussels are unsuitable for such use and would displace the clams.
(C) There is no mechanical means available for clearing intake pipes by scraping the mussels from them.
(D) The algae on which the mussels feed would, if not consumed by the mussels, themselves clog the intake pipes of nuclear power plants and water plants.
(E) Any hazardous waste the mussels remove from chemical-plant discharge will remain in the mussels, if they do not transform it, and they then must be regarded as hazardous waste.

A) Eliminate : Transatlantic freighters...new info
B) Eliminate : Mississippi River..new info
C) Eliminate : Clearing intake pipes..No mention of this has been made in the stimulus.
D) Eliminate : The algae on which the mussels feed would, if not consumed by the mussels,
Bold part here is an assumption made... and hence this answer is incorrect as whatever is said in the stimulus is taken as TRUE.
E) Correct answer: Just an extension to the last line but not to a great extent. This seems pretty obvious.

Thanks,
-V
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03 Feb 2011, 12:54
OA is E ..

This is not a Must be true question . It is just that among the answer choices, E is the best answer choice which can be supported by the passage.
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Re: Zebra mussels, a nuisance when they clog the intake pipes of [#permalink]

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03 Feb 2011, 23:04
E makes a little sense. But not by long. E is just en extension of the last sentence.What is the source of this question?
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Re: Zebra mussels, a nuisance when they clog the intake pipes of [#permalink]

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13 Apr 2011, 02:44
vineet474 wrote:
Zebra mussels, a nuisance when they clog the intake pipes of nuclear power plants and water plants along the Great Lakes, have some redeeming qualities. Since the mussels feed voraciously on algae that they filter from the water that passes by them, bags of zebra mussels suspended in the discharge streams of chemical plants significantly improve water quality, even removing some hazardous waste.

Which one of the following is most strongly supported on the basis of the statements above, if they are true?

(A) Zebra mussels arrived in the Great Lakes on transatlantic freighters and, since they have no natural enemies there, are rapidly displacing the native species of clams.
(B) If the mussels spread to areas of the Mississippi River where native clams provide the basis for a cultured pearl industry, that industry will collapse, since the mussels are unsuitable for such use and would displace the clams.
(C) There is no mechanical means available for clearing intake pipes by scraping the mussels from them.
(D) The algae on which the mussels feed would, if not consumed by the mussels, themselves clog the intake pipes of nuclear power plants and water plants.
(E) Any hazardous waste the mussels remove from chemical-plant discharge will remain in the mussels, if they do not transform it, and they then must be regarded as hazardous waste.

A) Eliminate : Transatlantic freighters...new info
B) Eliminate : Mississippi River..new info
C) Eliminate : Clearing intake pipes..No mention of this has been made in the stimulus.
D) Eliminate : The algae on which the mussels feed would, if not consumed by the mussels,
Bold part here is an assumption made... and hence this answer is incorrect as whatever is said in the stimulus is taken as TRUE.
E) Correct answer: Just an extension to the last line but not to a great extent. This seems pretty obvious.

Thanks,
-V

Feb seems to be a long time.. Am sorry for dropping in so late.. have a query regarding the explanation given by Vineet here...

Since option D was eliminated on the basis of it having an assumption "if not consumed..." in the option, option E also has a similar assumption " if they do not transform it" ... So why does this option be true instead of D??

Secondly, Manhattan review says that Draw a Conclusion question type,
requires us to find something that must be true according to the given premises, not
something that could be true or merely sounds reasonable. So in this case option E predicts by using the word "will" in its option.

So how is E, the correct answer choice???
Can anyone explain me the logic???

Thanks.
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15 Apr 2011, 01:26
Well, IMO, answer should be D and not E

Not E because the premise says mussels are EVEN removing hazardouz waste, and presents it as a good thing (remember, the premise says mussels have REDEEMING qualities).
E answer sounds like finally mussels become dangerous when they eat hazardous waste, this is a contradiction of the premise.

D because "if not consumed by the mussels" is not an assumption : this answer just describe the situation where mussels are removed form the staff of the plant : then algae finally also clog pipes.
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Re: Zebra mussels, a nuisance when they clog the intake pipes of [#permalink]

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01 May 2011, 04:41
E is the answer.@saku your reasoning is flawed . the zebra mussels (whatever that means) improve the water quality by removing hazardous waste from the water. that they improve the quality of water is their redeeming quality.

now as the quality of water is improved , that water has no business in this question, but the zebra mussels still have the hazardous waste inside them. if that waste is not transformed , and it is still present in the same amount inside zebra muscles , the zebra muscles are themselves hazardous now, in equal amount as hazardous waste was.

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Re: Zebra mussels, a nuisance when they clog the intake pipes of [#permalink]

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01 May 2011, 09:42
Zebra mussels, a nuisance when they clog the intake pipes of nuclear power plants and water plants along the Great Lakes, have some redeeming qualities. Since the mussels feed voraciously on algae that they filter from the water that passes by them, bags of zebra mussels suspended in the discharge streams of chemical plants significantly improve water quality, even removing some hazardous waste.

Which one of the following is most strongly supported on the basis of the statements above, if they are true?

(A) Zebra mussels arrived in the Great Lakes on transatlantic freighters and, since they have no natural enemies there, are rapidly displacing the native species of clams.
(B) If the mussels spread to areas of the Mississippi River where native clams provide the basis for a cultured pearl industry, that industry will collapse, since the mussels are unsuitable for such use and would displace the clams.
(C) There is no mechanical means available for clearing intake pipes by scraping the mussels from them.
(D) The algae on which the mussels feed would, if not consumed by the mussels, themselves clog the intake pipes of nuclear power plants and water plants.
(E) Any hazardous waste the mussels remove from chemical-plant discharge will remain in the mussels, if they do not transform it, and they then must be regarded as hazardous waste.

D, in my opinion.

Argument says that the mussels have redeeming quality that they get rid of algae when water is going into the factory and they also remove hazardous waste coming out of the plant.

(D) It is supporting the argument that mussels are indeed beneficial because the algae, which is removed by them, would anyway clog the inlet pipes. This negates the demerit that mussels are nuisance because they clog the inlet pipes. Supporting.

(E) This is going against the argument which says that mussels are removing hazardous waste. If this statement is true, in reality mussels would not be removing any hazardous waste and thus will have no redeeming quality.
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Re: Zebra mussels, a nuisance when they clog the intake pipes of [#permalink]

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08 Jun 2012, 02:51
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Zebra mussels, a nuisance when they clog the intake pipes of nuclear power plants and water plants along the Great Lakes, have some redeeming qualities. Since the mussels feed voraciously on algae that they filter from the water that passes by them, bags of zebra mussels suspended in the discharge streams of chemical plants significantly improve water quality, even removing some hazardous waste.

Which one of the following is most strongly supported on the basis of the statements above, if they are true?

(A) Zebra mussels arrived in the Great Lakes on transatlantic freighters and, since they have no natural enemies there, are rapidly displacing the native species of clams.
(B) If the mussels spread to areas of the Mississippi River where native clams provide the basis for a cultured pearl industry, that industry will collapse, since the mussels are unsuitable for such use and would displace the clams.
(C) There is no mechanical means available for clearing intake pipes by scraping the mussels from them.
(D) The algae on which the mussels feed would, if not consumed by the mussels, themselves clog the intake pipes of nuclear power plants and water plants.
(E) Any hazardous waste the mussels remove from chemical-plant discharge will remain in the mussels, if they do not transform it, and they then must be regarded as hazardous waste.

Responding to a pm:

This is not a conclusion question per se. It is only asking you for the option which is best supported by the premises. Something that is most probable to be true based on the given premises. Since the premises tell us that the mussels remove some hazardous waste from the water, so they must have the waste inside them and if they don't transform it into non-hazardous, the mussels themselves must be hazardous. It is something we can 'infer' from the premises.
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Re: Zebra mussels, a nuisance when they clog the intake pipes of [#permalink]

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29 Oct 2014, 19:33
VeritasPrepKarishma wrote:
Zebra mussels, a nuisance when they clog the intake pipes of nuclear power plants and water plants along the Great Lakes, have some redeeming qualities. Since the mussels feed voraciously on algae that they filter from the water that passes by them, bags of zebra mussels suspended in the discharge streams of chemical plants significantly improve water quality, even removing some hazardous waste.

Which one of the following is most strongly supported on the basis of the statements above, if they are true?

(A) Zebra mussels arrived in the Great Lakes on transatlantic freighters and, since they have no natural enemies there, are rapidly displacing the native species of clams.
(B) If the mussels spread to areas of the Mississippi River where native clams provide the basis for a cultured pearl industry, that industry will collapse, since the mussels are unsuitable for such use and would displace the clams.
(C) There is no mechanical means available for clearing intake pipes by scraping the mussels from them.
(D) The algae on which the mussels feed would, if not consumed by the mussels, themselves clog the intake pipes of nuclear power plants and water plants.
(E) Any hazardous waste the mussels remove from chemical-plant discharge will remain in the mussels, if they do not transform it, and they then must be regarded as hazardous waste.

Responding to a pm:

This is not a conclusion question per se. It is only asking you for the option which is best supported by the premises. Something that is most probable to be true based on the given premises. Since the premises tell us that the mussels remove some hazardous waste from the water, so they must have the waste inside them and if they don't transform it into non-hazardous, the mussels themselves must be hazardous. It is something we can 'infer' from the premises.

Thanks Karishma,the explanation helps to clear away some of my doubts.
Could u please tell me of any sources from where I could get more Inference based CRs for practice!This is probably the only type of CR where a700 level questions are getting me into a real mess.
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Re: Zebra mussels, a nuisance when they clog the intake pipes of [#permalink]

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02 Nov 2014, 03:26
Zebra mussels, a nuisance when they clog the intake pipes of nuclear power plants and water plants along the Great Lakes, have some redeeming qualities. Since the mussels feed voraciously on algae that they filter from the water that passes by them, bags of zebra mussels suspended in the discharge streams of chemical plants significantly improve water quality, even removing some hazardous waste.

Which one of the following is most strongly supported on the basis of the statements above, if they are true?

(A) Zebra mussels arrived in the Great Lakes on transatlantic freighters and, since they have no natural enemies there, are rapidly displacing the native species of clams.
(B) If the mussels spread to areas of the Mississippi River where native clams provide the basis for a cultured pearl industry, that industry will collapse, since the mussels are unsuitable for such use and would displace the clams.
(C) There is no mechanical means available for clearing intake pipes by scraping the mussels from them.
(D) The algae on which the mussels feed would, if not consumed by the mussels, themselves clog the intake pipes of nuclear power plants and water plants.
(E) Any hazardous waste the mussels remove from chemical-plant discharge will remain in the mussels, if they do not transform it, and they then must be regarded as hazardous waste.

I got this one right by elimination.
A - transatlantic freighters - New Info, so wrong
B - native clams - New info, we only know about Algae and hazardous waste - Wrong
C - The passages discusses that the mussels are a mess, but didn't point out that that there's are no means to clean them.
D - No. The algae is filtered from water. It doesn't mean that the algae would clog the pipelines
E - This can be deduced. Mussels consume the hazardous waste and if they don't process the waste, the mussels would be regarded as hazardous. Ans
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Re: Zebra mussels, a nuisance when they clog the intake pipes of [#permalink]

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03 May 2015, 04:34
Zebra mussels, a nuisance when they clog the intake pipes of nuclear power plants and water plants along the Great Lakes, have some redeeming qualities. Since the mussels feed voraciously on algae that they filter from the water that passes by them, bags of zebra mussels suspended in the discharge streams of chemical plants significantly improve water quality, even removing some hazardous waste.

Which one of the following is most strongly supported on the basis of the statements above, if they are true?

(A) Zebra mussels arrived in the Great Lakes on transatlantic freighters and, since they have no natural enemies there, are rapidly displacing the native species of clams.
(B) If the mussels spread to areas of the Mississippi River where native clams provide the basis for a cultured pearl industry, that industry will collapse, since the mussels are unsuitable for such use and would displace the clams.
(C) There is no mechanical means available for clearing intake pipes by scraping the mussels from them.
(D) The algae on which the mussels feed would, if not consumed by the mussels, themselves clog the intake pipes of nuclear power plants and water plants.
(E) Any hazardous waste the mussels remove from chemical-plant discharge will remain in the mussels, if they do not transform it, and they then must be regarded as hazardous waste.

All except E is irrelevant

E is correct choice.
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