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Zoologists warn--evaluate

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Zoologists warn--evaluate

by champmag » Wed May 25, 2011 6:22 am

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Zoologists warn of an imminent surge in the number of bird species that will become extinct within this century.Nevertheless, these zoologists are wrong. One need only consider the information gathered on native North American raptors, such as bald eagles and peregrine falcons. Several of these species came close to vanishing between 1900 and 1970, but since 1970, the local populations of these raptors have rebounded. The answer to which of the following questions provides information that would be most helpful in evaluating the argument above?

"¢ How many species of non-native raptors have been introduced into North America since 1970?
"¢ What special efforts, if any, have been made to rescue native North American raptors since 1970?
"¢ How many years' experience do the zoologists have in evaluating patterns of extinction among animals?
"¢ To what degree have native North American raptors migrated to other parts of the world?
"¢ How many acres of woodland are set aside each year as bird refuges?
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by Ozlemg » Wed May 25, 2011 6:39 am

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IMO : A

conclusion is, zoologists are wrong with their assertion which is the number of bird species will become extinct. If we know the number of non-native species have been introduced since 70s, we can conclude that the problem is only with raptors but not other species.
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by sourabh33 » Wed May 25, 2011 7:57 am

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IMO B

Question Type: Evaluate the argument

Claim 1: Zoologists warn an increase in nos of bird extinction
Claim 2: Zoologists are wrong --> birds will not vanish

Support offered for claim 2: Several NA native species were near extinction but nonetheless their population increased back.

Now, we have to find an option that would validate one of the conclusions while dismiss the other. This calls for testing the options on the extreme ends and determining their results.

A. How many species of non-native raptors have been introduced into North America since 1970?

Extreme 1-> Many Non native raptors were introduced
Extreme 2-> Non many native raptors were introduced

Above statement do not impact either of the conclusions as the statement talks about non native birds

B. What special efforts, if any, have been made to rescue native North American raptors since 1970?

Extreme 1-> Large amount of work was done to rescue the raptors
Extreme 2-> No amount of work was done to rescue the raptors

Now, Extreme 1 supports the conclusion 1, and extreme 2 supports the conclusion 2
If large amount of work was done, it could mean that raptors were near extinction but were svaed due to rescue efforts. Conversely, If no amount of work was done, it would mean that raptors had no danger of extinction

Therefore this should be the answer

C. How many years' experience do the zoologists have in evaluating patterns of extinction among animals?

Not Relevant, as the experience may not impact the actual finding of increase in number of birds. The lack of experience could only prove that the zoologists wrongly/expertly interpret the situation. But, when there is a fact available the experience may not help in evaluating the argument.

D. To what degree have native North American raptors migrated to other parts of the world?

Again, not relevant, as migration of birds may not be considered as extinction.

E. How many acres of woodland are set aside each year as bird refuges?

Could have been relevant if it were to say "How many of woodlands were set aside in 1970". As this talks about efforts every year, this may not be relevant in verifying the claim of 1970.
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by itsmebharat » Thu May 26, 2011 12:11 am

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IMO : B
What special efforts, if any, have been made to rescue native North American raptors since 1970?
C,D,E are irrelevant as they discuss about the exp of zoologists, degree of raptors migration, and acres of woodland.

In A, the arguments is discussing about Native America raptors not non-native.
I am not an Expert, please feel free to suggest if there is an error.
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by mundasingh123 » Thu May 26, 2011 2:51 am

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Nice work guys
I Seek Explanations Not Answers
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by sanabk » Thu May 26, 2011 2:19 pm

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by champmag » Thu May 26, 2011 8:35 pm

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Thanx guys. I got the point.
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by Mo2men » Mon May 20, 2019 8:03 pm

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champmag wrote:Zoologists warn of an imminent surge in the number of bird species that will become extinct within this century.Nevertheless, these zoologists are wrong. One need only consider the information gathered on native North American raptors, such as bald eagles and peregrine falcons. Several of these species came close to vanishing between 1900 and 1970, but since 1970, the local populations of these raptors have rebounded. The answer to which of the following questions provides information that would be most helpful in evaluating the argument above?

A. How many species of non-native raptors have been introduced into North America since 1970?
B. What special efforts, if any, have been made to rescue native North American raptors since 1970?
C. How many years' experience do the zoologists have in evaluating patterns of extinction among animals?
D. To what degree have native North American raptors migrated to other parts of the world?
E. How many acres of woodland are set aside each year as bird refuges?
Dear GMATGuru,

Why answer Choice D wrong?

If I test the EXTREMES

Significant number native North American raptors migrated to other parts of the world............It implies the remaining raptors are very low in local area and hence subject to extinction............strengthening the Zoologist's view

Few number of native North American raptors migrated to other parts of the world..................It implies the remaining raptors are abundant in local area and hence subject to extinction............Weakening the Zoologist's view

Does not both cases hurt the conclusion by weakening and strengthening the argument? or did I commit error of strengthening or weakening the premises/evidence?

Thanks
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