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Sportfishers introduced the Zander, a type of perch, to Britain’s rive

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Sportfishers introduced the Zander, a type of perch, to Britain’s rive  [#permalink]

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New post 07 Feb 2019, 12:15
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Sportfishers introduced the Zander, a type of perch, to Britain’s rivers and canals in the 1970s. Because zander eat large numbers of smaller fish, they have had a devastating effect on native fish populations. To protect the native fish, a government program removed a significant proportion of the zander from Britain’s waterways last year. Surprisingly, this year the loss of native fish to zander has been greater than before.

Which of the following, if true, would most help to explain the greater effect of zander on the native fish population?

A. The climate in Britain is very similar to the climate in regions to which zander are native.
B. Most of the zander removed were fully grown, and fully grown zander eat large numbers of smaller zander.
C. Every year a large number of zander are caught by sportfisher in Britain’s waterway.
D. Previous government program designed to remove nonnative species from Britain’s waterways have failed.
E. Zander are just one of several nonnative fish that prey on the other fish found in Britain’s waterway.

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Re: Sportfishers introduced the Zander, a type of perch, to Britain’s rive  [#permalink]

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New post 07 Feb 2019, 20:18
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Personal explanation:
B because Zander eats small fish and large Zander control the population of Zander.
No large Zander to control, less fish as small Zander will consume more small fish.

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Re: Sportfishers introduced the Zander, a type of perch, to Britain’s rive  [#permalink]

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New post 18 Jun 2019, 00:24
RESOLVE PARADOX

Sportfishers introduced the Zander, a type of perch, to Britain’s rivers and canals in the 1970s. Because zander eat large numbers of smaller fish, they have had a devastating effect on native fish populations. To protect the native fish, a government program removed a significant proportion of the zander from Britain’s waterways last year. Surprisingly, this year the loss of native fish to zander has been greater than before.

Which of the following, if true, would most help to explain the greater effect of zander on the native fish population?

A. The climate in Britain is very similar to the climate in regions to which zander are native.
Out of Scope because it doesnt explain anything.
B. Most of the zander removed were fully grown, and fully grown zander eat large numbers of smaller zander.
Best Answer to explain why native fish suffered even more.
C. Every year a large number of zander are caught by sportfisher in Britain’s waterway.
Does not explain why this year only the native fish suffered the most.
D. Previous government program designed to remove nonnative species from Britain’s waterways have failed.
The failed govt program does'nt explain this years native fish suffering.
E. Zander are just one of several nonnative fish that prey on the other fish found in Britain’s waterway.
Explains that why removing Zander would not make big impact but does'nt explain the part that why did native fish suffer more than last year.
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Re: Sportfishers introduced the Zander, a type of perch, to Britain’s rive  [#permalink]

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New post 18 Jun 2019, 04:15
Quote:
Sportfishers introduced the Zander, a type of perch, to Britain’s rivers and canals in the 1970s. Because zander eat large numbers of smaller fish, they have had a devastating effect on native fish populations. To protect the native fish, a government program removed a significant proportion of the zander from Britain’s waterways last year. Surprisingly, this year the loss of native fish to zander has been greater than before.

Which of the following, if true, would most help to explain the greater effect of zander on the native fish population?

A. The climate in Britain is very similar to the climate in regions to which zander are native.
B. Most of the zander removed were fully grown, and fully grown zander eat large numbers of smaller zander.
C. Every year a large number of zander are caught by sportfisher in Britain’s waterway.
D. Previous government program designed to remove nonnative species from Britain’s waterways have failed.
E. Zander are just one of several nonnative fish that prey on the other fish found in Britain’s waterway.


The correct answer here is B. This is a resolve the paradox question, so what we must first do here is to identify what that paradox is. In this question, it is that this year the loss of native fish to zander has been greater than before. Measures have been taken to prevent this, so we need some explanation that would help make sense of why zander have been eating other fish.

A - This does not help to explain why removing the zander has caused them to eat more native fish, just that they can survive. OUT

B - This actually does help. If the fully grown zander eat smaller zander, then one of their own predators has been removed from the chain. This allows the growing zander to go sicko mode on the other native fish populations.

C - If anything, this should be better still for the native fish. This deepens the paradox. OUT

D - This is totally irrelevant. It does not matter that previous programs failed, we know that this one at least did remove many zander. OUT

E - This is a bit tempting, but ultimately, it does not say those other predator fish increased. If they remained the same and the zander population dropped, we'd still expect to see fewer native fish killed. OUT

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Re: Sportfishers introduced the Zander, a type of perch, to Britain’s rive  [#permalink]

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New post 18 Jun 2019, 09:24
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carcass wrote:
Sportfishers introduced the Zander, a type of perch, to Britain’s rivers and canals in the 1970s. Because zander eat large numbers of smaller fish, they have had a devastating effect on native fish populations. To protect the native fish, a government program removed a significant proportion of the zander from Britain’s waterways last year. Surprisingly, this year the loss of native fish to zander has been greater than before.

Which of the following, if true, would most help to explain the greater effect of zander on the native fish population?

A. The climate in Britain is very similar to the climate in regions to which zander are native.
B. Most of the zander removed were fully grown, and fully grown zander eat large numbers of smaller zander.
C. Every year a large number of zander are caught by sportfisher in Britain’s waterway.
D. Previous government program designed to remove nonnative species from Britain’s waterways have failed.
E. Zander are just one of several nonnative fish that prey on the other fish found in Britain’s waterway.


Hi carcass

This question is 'resolve the paradox'. Can you please change the tag please?
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Re: Sportfishers introduced the Zander, a type of perch, to Britain’s rive  [#permalink]

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New post 18 Jun 2019, 09:25
Mo2men wrote:
carcass wrote:
Sportfishers introduced the Zander, a type of perch, to Britain’s rivers and canals in the 1970s. Because zander eat large numbers of smaller fish, they have had a devastating effect on native fish populations. To protect the native fish, a government program removed a significant proportion of the zander from Britain’s waterways last year. Surprisingly, this year the loss of native fish to zander has been greater than before.

Which of the following, if true, would most help to explain the greater effect of zander on the native fish population?

A. The climate in Britain is very similar to the climate in regions to which zander are native.
B. Most of the zander removed were fully grown, and fully grown zander eat large numbers of smaller zander.
C. Every year a large number of zander are caught by sportfisher in Britain’s waterway.
D. Previous government program designed to remove nonnative species from Britain’s waterways have failed.
E. Zander are just one of several nonnative fish that prey on the other fish found in Britain’s waterway.


Hi carcass

This question is 'resolve the paradox'. Can you please change the tag please?

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Sportfishers introduced the Zander, a type of perch, to Britain’s rive  [#permalink]

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New post 18 Jun 2019, 17:39
carcass wrote:
Sportfishers introduced the Zander, a type of perch, to Britain’s rivers and canals in the 1970s. Because zander eat large numbers of smaller fish, they have had a devastating effect on native fish populations. To protect the native fish, a government program removed a significant proportion of the zander from Britain’s waterways last year. Surprisingly, this year the loss of native fish to zander has been greater than before.

Which of the following, if true, would most help to explain the greater effect of zander on the native fish population?


Question Type: Explain, therefore do not try to prethink the assumption as there can be n no. of solutions to such problems
Prompt: Zander eats native > removing zander, native population further down
Missing Info: what is the relation/equation between zander and native population now

A. The climate in Britain is very similar to the climate in regions to which zander are native. - does not tell anything about relation
B. Most of the zander removed were fully grown, and fully grown zander eat large numbers of smaller zander. - Bingo! clearly defines the reason of natives pop. fall. If the big zanders were to eat smaller ones, then now the canal is left with good pop. of smaller ones, which in turn would eat more natives
C. Every year a large number of zander are caught by sportfisher in Britain’s waterway - so what even govt. has removed many zanders, does not tell anything about relation
D. Previous government program designed to remove nonnative species from Britain’s waterways have failed. - does not tell anything about relation
E. Zander are just one of several nonnative fish that prey on the other fish found in Britain’s waterway.- we are not concerned about the other fish preys, does not tell anything about relation
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Sportfishers introduced the Zander, a type of perch, to Britain’s rive   [#permalink] 18 Jun 2019, 17:39
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Sportfishers introduced the Zander, a type of perch, to Britain’s rive

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