A 20 percent decline in lobster catches in Maine waters : GMAT Critical Reasoning (CR)
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# A 20 percent decline in lobster catches in Maine waters

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Director
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A 20 percent decline in lobster catches in Maine waters [#permalink]

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20 Jan 2009, 20:57
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A 20 percent decline in lobster catches in Maine waters since 1980 can be justifiably blamed on legislation passed in 1972 to protect harbor seals. Maine's population of harbor seals is now double the level existing before protection was initated, and these seals are known to eat both fish and lobsters.

Which of the following, if true, would most seriously weaken the argument above?

a) Harbor seals usually eat more fish than lobsters, but the seals are natural predators of both
b) Although harbor seals are skillful predators of lobsters, they rarely finish eating their catch
c) Harbor seals attract tourists to Maine's coastal areas, thus revitalizing the local economy
d) Authors of the 1972 legislation protecting harbor seals were convinced that an increase in that animal's numbers would not have measurably negative impact on the lobster catch
e) The record lobster harvests of the late 1970's removed large numbers of mature lobsters from the reporductive stock.

E
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Re: CR: decline in lobster [#permalink]

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20 Jan 2009, 21:21
reply2spg wrote:
A 20 percent decline in lobster catches in Maine waters since 1980 can be justifiably blamed on legislation passed in 1972 to protect harbor seals. Maine's population of harbor seals is now double the level existing before protection was initated, and these seals are known to eat both fish and lobsters.

Which of the following, if true, would most seriously weaken the argument above?

a) Harbor seals usually eat more fish than lobsters, but the seals are natural predators of both
b) Although harbor seals are skillful predators of lobsters, they rarely finish eating their catch
c) Harbor seals attract tourists to Maine's coastal areas, thus revitalizing the local economy
d) Authors of the 1972 legislation protecting harbor seals were convinced that an increase in that animal's numbers would not have measurably negative impact on the lobster catch
e) The record lobster harvests of the late 1970's removed large numbers of mature lobsters from the reporductive stock.

E

Interesting question.!

The reasoning is:
1. the increase in habor seals
2. harbor seals eat fish and lobsters

A, that the seals are natural predators of lobster STRENTHENs rather than weakens the argument, A out

B, also suggests that harbor seals are natural predator of lobsters. Should not be confused with "finish eating". B strenthens rather than weakens Argument, B out

C. irrelevant

D. Whether or not the authors are convinced... does not affect the legistation passed, assuming that C strenthens argument also. C out

E. correct. E sussests that the lobsters are not, or little, effected by the predators, therefore the legistation passed.

E wins the games
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Re: CR: decline in lobster [#permalink]

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21 Jan 2009, 00:14
reply2spg wrote:
A 20 percent decline in lobster catches in Maine waters since 1980 can be justifiably blamed on legislation passed in 1972 to protect harbor seals. Maine's population of harbor seals is now double the level existing before protection was initated, and these seals are known to eat both fish and lobsters.

Which of the following, if true, would most seriously weaken the argument above?

a) Harbor seals usually eat more fish than lobsters, but the seals are natural predators of both
b) Although harbor seals are skillful predators of lobsters, they rarely finish eating their catch
c) Harbor seals attract tourists to Maine's coastal areas, thus revitalizing the local economy
d) Authors of the 1972 legislation protecting harbor seals were convinced that an increase in that animal's numbers would not have measurably negative impact on the lobster catch
e) The record lobster harvests of the late 1970's removed large numbers of mature lobsters from the reporductive stock.

E

E
can be easily derived by the time period author is talking about!

if E is true, then the decline in catching of lobster is due to removal large numbers of mature lobsters from the reporductive stock rather seal eating them...
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Re: CR: decline in lobster [#permalink]

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21 Jan 2009, 00:54
Agree with Sodenso. My ans is also E
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Re: CR: decline in lobster [#permalink]

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21 Jan 2009, 10:30
E
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Re: CR: decline in lobster [#permalink]

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21 Jan 2009, 11:09
Easy ...option E.
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Re: CR: decline in lobster [#permalink]

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21 Jan 2009, 12:45
clear E.

Weaken Q. X causes Y look for choice that says Z causes(d) Y

Thanks
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Re: CR: decline in lobster [#permalink]

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21 Jan 2009, 13:17
easy E.
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Re: CR: decline in lobster [#permalink]

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21 Jan 2009, 14:01
sondenso wrote:
reply2spg wrote:
A 20 percent decline in lobster catches in Maine waters since 1980 can be justifiably blamed on legislation passed in 1972 to protect harbor seals. Maine's population of harbor seals is now double the level existing before protection was initated, and these seals are known to eat both fish and lobsters.

Which of the following, if true, would most seriously weaken the argument above?

a) Harbor seals usually eat more fish than lobsters, but the seals are natural predators of both
b) Although harbor seals are skillful predators of lobsters, they rarely finish eating their catch
c) Harbor seals attract tourists to Maine's coastal areas, thus revitalizing the local economy
d) Authors of the 1972 legislation protecting harbor seals were convinced that an increase in that animal's numbers would not have measurably negative impact on the lobster catch
e) The record lobster harvests of the late 1970's removed large numbers of mature lobsters from the reporductive stock.

E

Interesting question.!

The reasoning is:
1. the increase in habor seals
2. harbor seals eat fish and lobsters

A, that the seals are natural predators of lobster STRENTHENs rather than weakens the argument, A out

B, also suggests that harbor seals are natural predator of lobsters. Should not be confused with "finish eating". B strenthens rather than weakens Argument, B out

C. irrelevant

D. Whether or not the authors are convinced... does not affect the legistation passed, assuming that C strenthens argument also. C out

E. correct. E sussests that the lobsters are not, or little, effected by the predators, therefore the legistation passed.

E wins the games

Good analysis! E it is.
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Re: CR: decline in lobster [#permalink]

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21 Jan 2009, 14:54
OA E
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Re: A 20 percent decline in lobster catches in Maine waters [#permalink]

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22 Sep 2012, 02:15
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Argument says

A ( legislation passed) --> B (decline in lobster catches)

option E says, C ( removed large numbers of mature lobsters from the reproductive stock )---> B (decline in lobster catches)

Option E give us another reason for decline in population.
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Re: A 20 percent decline in lobster catches in Maine waters [#permalink]

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24 Jul 2016, 01:53
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Re: A 20 percent decline in lobster catches in Maine waters [#permalink]

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24 Jul 2016, 03:34
argument sums up in the first line
why would the author mention the second line in the argument
Can someone elaborate please?

Also help me choose between D&E via the negation technique.
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A 20 percent decline in lobster catches in Maine waters [#permalink]

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24 Jul 2016, 13:38
paidlukkha wrote:
argument sums up in the first line
why would the author mention the second line in the argument
Can someone elaborate please?

Also help me choose between D&E via the negation technique.

Negation technique does not work very well with weaken questions - I would suggest to use negation only for assumption questions. For weaken / strengthen, use the following:

Conclusion: X causes Z

Type A:
Strengthen: Y does not cause Z
Weaken: Y causes Z

Type B:
Strengthen: Z does not cause X
Weaken: Z causes X

This problem is of type A weaken.
X= Increase in population of harbour seals.
Z = reduction in number of lobster.
Y = taking out mature lobster from reproductive stock.

Conclusion: Increase in population of harbour seals caused reduction in number of lobster. (i.e.X caused Z).
Weakening statement: Something else, taking out mature lobster from reproductive stock, caused reduction in number of lobster. (i.e., Y caused Z)

Hence E is the correct answer.
A 20 percent decline in lobster catches in Maine waters   [#permalink] 24 Jul 2016, 13:38
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# A 20 percent decline in lobster catches in Maine waters

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