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

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During the day in Lake Constance, the zooplankton D. hyaline departs f  [#permalink]

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New post 03 Jun 2018, 12:50
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84% (01:17) correct 16% (01:40) wrong based on 92 sessions

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

E. 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 departs f  [#permalink]

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New post 03 Jun 2018, 17:52
Is it C...If D. Hyaline matures more slowly than D. Galeta, population of D. Hyaline will outnumber the population of D Galeta.

C is good choice among given choices.
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Re: During the day in Lake Constance, the zooplankton D. hyaline departs f  [#permalink]

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New post 03 Jun 2018, 20:43
Clear B man.good question this.

B and C are the main contenders

B - Says why D.g population is less

C - Restates what is already given in the passage(D.g reproduces faster).Hence incorrect.
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Re: During the day in Lake Constance, the zooplankton D. hyaline departs f  [#permalink]

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New post 04 Jun 2018, 05:21
IMO the answer is B. Because only B gives a reason to why the population of D.G would decrease and D.H would remain unaffected.
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During the day in Lake Constance, the zooplankton D. hyaline departs f  [#permalink]

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New post 04 Jun 2018, 07:13
Even though D. galeata grows and reproduces much faster, its population is often outnumbered by D. hyaline.

Option B says Predators of Zooplankton D. zylen live and feed near surface during the day. Predators are feeding on D.Z. not on D.G.
Then how would population of D.G. reduce?

Please clear my confusion.

SajjitaKundu wrote:
IMO the answer is B. Because only B gives a reason to why the population of D.G would decrease and D.H would remain unaffected.
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Re: During the day in Lake Constance, the zooplankton D. hyaline departs f  [#permalink]

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New post 04 Jun 2018, 13:30
gvij2017 wrote:
Even though D. galeata grows and reproduces much faster, its population is often outnumbered by D. hyaline.

Option B says Predators of Zooplankton D. zylen live and feed near surface during the day. Predators are feeding on D.Z. not on D.G.
Then how would population of D.G. reduce?

Please clear my confusion.

SajjitaKundu wrote:
IMO the answer is B. Because only B gives a reason to why the population of D.G would decrease and D.H would remain unaffected.

The predators are of zooplankton and not of any specific kind. During day G is near the surface so predators eat more G.
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During the day in Lake Constance, the zooplankton D. hyaline departs f  [#permalink]

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New post 05 Jun 2018, 13:29
Two possible explanations:

1. No. of eggs laid / offsprings produced by DH >DG:
Ans choice E is opposite to this info.

2. Life-span of DH >DG: Ans choice B.

Hence, IMO, Ans is choice B

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Re: During the day in Lake Constance, the zooplankton D. hyaline departs f  [#permalink]

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New post 09 Jun 2018, 19:46
B . ONLY If D. Hyaline and D. galatia are both sub species of zooplankton .
Re: During the day in Lake Constance, the zooplankton D. hyaline departs f &nbs [#permalink] 09 Jun 2018, 19:46
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