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# V08-11

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Current Student
Joined: 19 Mar 2012
Posts: 4273
Location: India
GMAT 1: 760 Q50 V42
GPA: 3.8
WE: Marketing (Non-Profit and Government)

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04 Aug 2015, 08:29
00:00

Difficulty:

45% (medium)

Question Stats:

67% (01:16) correct 33% (01:36) wrong based on 45 sessions

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When there is more rainfall than normal, the water levels of subtropical rivers overflow and water gathers high speed. Because Pentaflora, an aquatic whose habitat in river water grows best in slow-moving water, the amount of Pentaflora per unit of water generally increases when there has been less rainfall and slow moving water. By contrast, however, following a period of high rainfall, Pentaflora levels are high even in speedy waters which have been dammed. Which of the following, if true, does most to explain the contrast described above?

A. Extreme speed does not cause the populations of the feeders of Pentaflora to fall.
B. The temperature of the more and more slowly moving water is more and more conducive for the growth of Pentaflora.
C. High Pentaflora populations lead to toxic levels of the river waters for some other fragile inhabitants that usually live in the local environment.
D. High rainfall causes subtropical rivers to swell completely for short stints.
E. Water release by means of damming is helpful for the higher growth of Pentaflora than by not damming due to optimal speed.

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Current Student
Joined: 19 Mar 2012
Posts: 4273
Location: India
GMAT 1: 760 Q50 V42
GPA: 3.8
WE: Marketing (Non-Profit and Government)

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04 Aug 2015, 08:29
Official Solution:

When there is more rainfall than normal, the water levels of subtropical rivers overflow and water gathers high speed. Because Pentaflora, an aquatic whose habitat in river water grows best in slow-moving water, the amount of Pentaflora per unit of water generally increases when there has been less rainfall and slow moving water. By contrast, however, following a period of high rainfall, Pentaflora levels are high even in speedy waters which have been dammed. Which of the following, if true, does most to explain the contrast described above?

A. Extreme speed does not cause the populations of the feeders of Pentaflora to fall.
B. The temperature of the more and more slowly moving water is more and more conducive for the growth of Pentaflora.
C. High Pentaflora populations lead to toxic levels of the river waters for some other fragile inhabitants that usually live in the local environment.
D. High rainfall causes subtropical rivers to swell completely for short stints.
E. Water release by means of damming is helpful for the higher growth of Pentaflora than by not damming due to optimal speed.

A. The Paradox of why high rainfall causes higher Pentaflora is not explained

B. temperature is irrelevant to the topic

C. Toxicity is not discussed here

D. does not touch upon Pentafloara population

E. Correct choice; damming leads to slow release of water, resulting in higher Pentaflora growth

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Joined: 03 Nov 2015
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Location: United States
GPA: 3.65
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01 Jan 2016, 20:18
Shouldn't E read: Water release by means of damming is more helpful for the higher growth of Pentaflora...
Intern
Joined: 28 May 2014
Posts: 6
Schools: HBS '19 (WD)

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20 Jan 2016, 04:14
I think this the explanation isn't clear enough, please elaborate.
Current Student
Joined: 09 Jan 2015
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Concentration: Entrepreneurship, Finance
GMAT 1: 760 Q50 V42
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06 Mar 2016, 08:29
Not sure if I agree with the answer.

It says "following a period of high rainfall, Pentaflora levels are high even in speedy waters which have been dammed". This suggests that Pentaflora levels are also high in non-dammed waters, after a period of high rainfall. Answer E would only explain waters Pentaflora levels for dammed waters.

Answer A is actually legitimate: high rainfall -> high speed -> population of feeders drops -> Pentaflora levels increase
Manager
Joined: 08 Jul 2015
Posts: 53
GPA: 3.8
WE: Project Management (Energy and Utilities)

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01 Jun 2016, 21:56
This is similar to OG16-CR (reverse way), I found a good explanation here for reference:
when there is less fainfall
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Joined: 22 Jun 2016
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09 Jul 2016, 14:05
Completely agree with kpl. I eliminated E solely because the passage does not imply all populations are in dammed areas.

A makes sense as an answer and I have seen this logic in a handful of OG questions.
Retired Moderator
Joined: 14 Dec 2013
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Location: Germany
Schools: German MBA
GMAT 1: 780 Q50 V47
WE: Corporate Finance (Pharmaceuticals and Biotech)

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10 Jul 2016, 12:57
dmaze01 wrote:
Completely agree with kpl. I eliminated E solely because the passage does not imply all populations are in dammed areas.

A makes sense as an answer and I have seen this logic in a handful of OG questions.

Thank you for the feedback. Option A has been amended accordingly.
Intern
Joined: 24 Jun 2017
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28 Aug 2017, 21:46
The second sentence doesn't make sense.
Re: V08-11   [#permalink] 28 Aug 2017, 21:46
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# V08-11

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