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# In deep temperate lakes, water temperatures vary according to depth. I

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In deep temperate lakes, water temperatures vary according to depth. I  [#permalink]

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Updated on: 30 Jul 2019, 04:29
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Difficulty:

95% (hard)

Question Stats:

42% (02:43) correct 58% (02:49) wrong based on 202 sessions

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In deep temperate lakes, water temperatures vary according to depth. In winter, the coldest water is at the top; in summer, at the bottom. The changes in temperature distribution, or "turnover," occur in fall and late winter. Lake trout will be found, as a rule, in the coldest water. So, if anglers seek Lake trout in deep temperate lakes while these lakes are partially iced over in late winter, they will do best to eschew the lake trout's summer haunts and fish instead in a shallow bay or close to the surface off a rocky point.

Which one of the following is an assumption on which the argument depends?

(A) The ease with which lake trout can be caught by anglers varies with the time of year and the water temperature.

(B) Cold water is denser, and therefore heavier, than relatively warmer water.

(C) Lake trout are found exclusively in deep temperate lakes.

(D) Lake trout do not alter their feeding habits from one part of the year to another.

(E) In deep temperate lakes that have ice residues on the surface, late-winter "turnover" has not yet occurred.

Originally posted by akanshaxo on 16 Feb 2019, 05:40.
Last edited by Skywalker18 on 30 Jul 2019, 04:29, edited 1 time in total.
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Re: In deep temperate lakes, water temperatures vary according to depth. I  [#permalink]

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16 Feb 2019, 06:16
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Option(A) The ease with which lake trout can be caught by anglers varies with the time of year and the water temperature.> Incorrect. (Even if true, this doesn't support the statement "why to avoid lake trout's summer haunts and fish instead in a shallow bay or close to the surface off a rocky point")
Option (B) Cold water is denser, and therefore heavier, than relatively warmer water.
Incorrect. (Unrelated)
Option (C) Lake trout are found exclusively in deep temperate lakes.
Incorrect. (The passage is about deep temperate lakes only.)
Option (D) Lake trout do not alter their feeding habits from one part of the year to another.
Incorrect. (Unrelated.)
Option (E)
(E) In deep temperate lakes that have ice residues on the surface, late-winter "turnover" has not yet occurred.
CORRECT !
Turnover takes place during late winters and fall. If turnover has already taken place (it's late winter, summer on the way ), then chances are trouts are now in deapth, where the water is coldest. Then it wouldn't make sense to fish in shallow waters, will it?
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Re: In deep temperate lakes, water temperatures vary according to depth. I  [#permalink]

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28 Jul 2019, 12:44
Bumping for further discussion.
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Re: In deep temperate lakes, water temperatures vary according to depth. I  [#permalink]

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29 Jul 2019, 14:15
My approach comes from the thought that if the Anglers want to fish during the late wintertime when the 'turnover' hasn't yet happened/ is soon approaching - as suggested by the shallow/partial ice, the ice would be more likely to melt, thus making it more dangerous to fish on - then, they would probably resort to more safer means like fishing on a shallow bay or close to a rocky point.
Its a matter of safety and not taking a risk.
Hence, when the fishermen stay close to the bay or on the rocks, that would mean the 'turnover' could happen at any point.

Experts, correct me if I'm wrong!
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Re: In deep temperate lakes, water temperatures vary according to depth. I  [#permalink]

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29 Jul 2019, 14:28
sharathnair14 wrote:
My approach comes from the thought that if the Anglers want to fish during the late wintertime when the 'turnover' hasn't yet happened/ is soon approaching - as suggested by the shallow/partial ice, the ice would be more likely to melt, thus making it more dangerous to fish on - then, they would probably resort to more safer means like fishing on a shallow bay or close to a rocky point.
Its a matter of safety and not taking a risk.
Hence, when the fishermen stay close to the bay or on the rocks, that would mean the 'turnover' could happen at any point.

Experts, correct me if I'm wrong!

Safety is never mentioned. We cannot assume something is dangerous or safe. We must use the information available to help bridge the gap. What you did is very dangerous, because the gmat writers will take advantage of common-sense knowledge.

The argument says the fish will be in X location or Y location due to temperature. And we will choose one location. Why? Because of the time of year and because the ice hasn’t reversed yet. Do not incorporate outside knowledge and make it more challenging for yourself. Use what is given.

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Re: In deep temperate lakes, water temperatures vary according to depth. I   [#permalink] 29 Jul 2019, 14:28
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