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During the day in Lake Constance, the zooplankton D. hyaline

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During the day in Lake Constance, the zooplankton D. hyaline [#permalink] New post   30 Jun 2019, 01:41
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During the day in Lake Constance, the zooplankton D. hyaline departs for the depths where food is scarce and the water cold. D. galeata remains near the warm surface where food is abundant. Even though D. galeata grows and reproduces much faster, its population is often outnumbered by D. hyaline.


Which of the following, if true, most helps to resolve the apparent paradox?


A. The number of species of zooplankton living at the bottom of the lake is twice that of species living at the surface.
B. Predators of zooplankton, such as whitefish and perch, live and feed near the surface of the lake during the day.
C. In order to make the most of scarce food resources, D.hyaline matures more slowly than D. galeata.
D. D. galeata clusters under vegetation during the hottest part of the day to avoid the Sun’s rays.
E. D. galeata produces twice as many offspring per individual in any given period of time as does D. hyaline.

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Re: During the day in Lake Constance, the zooplankton D. hyaline [#permalink] New post   08 Aug 2019, 22:06
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Since predators are near to the surface where D.galeata remains it was consumed faster by their predators and that is reason for being lesser than D.hyaline.
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Re: During the day in Lake Constance, the zooplankton D. hyaline [#permalink] New post   16 Sep 2020, 00:14
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During the day in Lake Constance, the zooplankton D. hyaline departs for the depths where food is scarce and the water cold. D. galeata remains near the warm surface where food is abundant. Even though D. galeata grows and reproduces much faster, its population is often outnumbered by D. hyaline.


Summary: Conditions for DG is great but the population is less in comparison to DH. So, the option that explains why are DH more/ DG less is the correct answer.

Which of the following, if true, most helps to resolve the apparent paradox?


A. The number of species of zooplankton living at the bottom of the lake is twice that of species living at the surface. TRAP: had to think a lot to reason it out. BUT hey it just says species. There might be some other species of zooplankton.

B. Predators of zooplankton, such as whitefish and perch, live and feed near the surface of the lake during the day. As DG lives in the surface, it shows the chances of being prey to the predators.

C. In order to make the most of scarce food resources, D.hyaline matures more slowly than D. galeata. Assuming maturing and population? We don't know anything about it.

D. D. galeata clusters under vegetation during the hottest part of the day to avoid the Sun’s rays. Irrelevant. It is just additional information about DG

E. D. galeata produces twice as many offspring per individual in any given period of time as does D. hyaline. Does the opposite. So, why DG is still less?
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Re: During the day in Lake Constance, the zooplankton D. hyaline [#permalink] New post   29 Sep 2020, 21:44
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During the day in Lake Constance, the zooplankton D. hyaline departs for the depths where food is scarce and the water cold. D. galeata remains near the warm surface where food is abundant. Even though D. galeata grows and reproduces much faster, its population is often outnumbered by D. hyaline.

Inferences:
There are two sub species of Zooplankton, one is D.hyaline and other one is D.galeata.
D. Galeata produces faster but still the population of THE.hyaline is more than D. Galeata.
D.hydaline stays at the depth and D.Galeate stays at the surface of the lake.

Which of the following, if true, most helps to resolve the apparent paradox?


A. The number of species of zooplankton living at the bottom of the lake is twice that of species living at the surface.
Wrong. This is very confusing but notice it’s not telling us which species of zooplankton is living in the bottom or at the surface.

B. Predators of zooplankton, such as whitefish and perch, live and feed near the surface of the lake during the day.
Right. If they are being killed more, it’s natural that D.hyaline will outnumber D.Galeata.

C. In order to make the most of scarce food resources, D.hyaline matures more slowly than D. galeata.
Wrong. This wouldn’t resolve the paradox but give the paradox it’s required strength.

D. D. galeata clusters under vegetation during the hottest part of the day to avoid the Sun’s rays.
Wrong. Out of context.

E. D. galeata produces twice as many offspring per individual in any given period of time as does D. hyaline.
Wrong. This is again strengthening the paradox and not resolving it.
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Re: During the day in Lake Constance, the zooplankton D. hyaline [#permalink] New post   21 Sep 2021, 12:54
janani11 wrote:
Since predators are near to the surface where D.galeata remains it was consumed faster by their predators and that is reason for being lesser than Hyaline.

they hunt only at day when Hyaline is also at the surface
A should be the answer
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During the day in Lake Constance, the zooplankton D. hyaline [#permalink] New post   21 Sep 2021, 12:57
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nandeta92 wrote:


A. The number of species of zooplankton living at the bottom of the lake is twice that of species living at the surface.
Wrong. This is very confusing but notice it’s not telling us which species of zooplankton is living in the bottom or at the surface.

B. Predators of zooplankton, such as whitefish and perch, live and feed near the surface of the lake during the day.
Right. If they are being killed more, it’s natural that D.hyaline will outnumber D.Galeata.

.

B is wrong because the predator hunt ant day time when D.hyaline and D.Galeata both at the surface
A is the right answer because it is telling you that D.hyaline live at the bottom during the night
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During the day in Lake Constance, the zooplankton D. hyaline [#permalink] New post   22 Sep 2021, 12:18
"During the day in Lake Constance, Zooplankton D. hyaline departs for the depths," meaning it leaves the warm water at the surface to go to the deeper water.

Also, having more species of plankton living at the bottom of the lake wouldn't have an affect the amount of D. galeata on the surface. Only predation can account for this discrepancy making B the correct answer.

If there are any rebuttals, please let me know.
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Re: During the day in Lake Constance, the zooplankton D. hyaline [#permalink] New post   22 Sep 2021, 13:34
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r1smith wrote:
"During the day in Lake Constance, Zooplankton D. hyaline departs for the depths," meaning it leaves the warm water at the surface to go to the deeper water.

Also, having more species of plankton living at the bottom of the lake wouldn't have an affect the amount of D. galeata on the surface. Only predation can account for this discrepancy making B the correct answer.

If there are any rebuttals, please let me know.

aha thank you
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