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# In Australia, in years with below-average rainfall, less water goes in

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In Australia, in years with below-average rainfall, less water goes in  [#permalink]

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22 Jun 2018, 09:32
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GMAT® Official Guide Verbal Review 2019

Practice Question
Question No.:
Online test bank question number : CR02865

In Australia, in years with below-average rainfall, less water goes into rivers and more water is extracted from rivers for drinking and irrigation. Consequently, in such years, water levels drop considerably and the rivers flow more slowly. Because algae grow better the more slowly the water in which they are growing moves, such years are generally beneficial to populations of algae. But, by contrast, populations of algae drop in periods of extreme drought.

Which of the following, if true, does most to explain the contrast?

(A) Algae grow better in ponds and lakes than in rivers.

(B) The more slowly water moves, the more conducive its temperature is to the growth of algae.

(C) Algae cannot survive in the absence of water.

(D) Algae must be filtered out of water before it can be used for drinking.

(E) The larger the population of algae in a body of water, the less sunlight reaches below the surface of the water.

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Re: In Australia, in years with below-average rainfall, less water goes in  [#permalink]

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22 Jun 2018, 09:44
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Argument: Algae growth is better when river water flows slowly but in periods of extreme drought populations of algae drop.

(A) Algae grow better in ponds and lakes than in rivers. - Irrelevant

(B) The more slowly water moves, the more conducive its temperature is to the growth of algae. - While mentioning about the drop in algae population, the argument focuses on periods of extreme drought. This option doesn't explain the paradox.

(C) Algae cannot survive in the absence of water. - Correct.

(D) Algae must be filtered out of water before it can be used for drinking. - Irrelevat

(E) The larger the population of algae in a body of water, the less sunlight reaches below the surface of the water. - Irrelevant.

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Re: In Australia, in years with below-average rainfall, less water goes in  [#permalink]

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22 Jun 2018, 12:28
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C can't be right. No where in the question says extreme drought means absence of water. In fact, extreme drought just means more water will be extracted from the river.
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Re: In Australia, in years with below-average rainfall, less water goes in  [#permalink]

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23 Jun 2018, 04:30
Canteenbottle wrote:
C can't be right. No where in the question says extreme drought means absence of water. In fact, extreme drought just means more water will be extracted from the river.

Hey

The premise doesn't anywhere mention that extreme drought means 'more water will be extracted from the river' . This statement is assumption that you think

also, this question is an 'resolve the paradox' kind of question. So external ideas are allowed

Only C answers the question, rest are all out of scope
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Re: In Australia, in years with below-average rainfall, less water goes in  [#permalink]

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23 Jun 2018, 09:01
"in years with below-average rainfall, less water goes into rivers and more water is extracted from rivers for drinking and irrigation." this is the info from the question. It is not an assumption I made. No where in the question suggests absence of water. Lack of water and absence of water are two different concepts.
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Re: In Australia, in years with below-average rainfall, less water goes in  [#permalink]

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24 Jun 2018, 00:02
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Hey Canteenbottle (BTW, nice name)

I am only referring to the statement in the previous comment "extreme drought just means more water will be extracted from the river"

We don't see any such statement or reference in the premise. Anyways, you are absolutely spot on here. Lack of water and absence of water are two different concepts and tthiss tells us why C is the right choice

Lack of water (rivers flow slowly) - algae growth is much better
Absence of water (drought) - No water at all, how will the algae grow? Hence populations of algae drop in periods of extreme drought

hence answer is C. Hope this helps
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Re: In Australia, in years with below-average rainfall, less water goes in  [#permalink]

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24 Jun 2018, 01:22
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A, D and E are clearly out.

(B) The more slowly water moves, the more conducive its temperature is to the growth of algae.
This doesn't tell why algae population decrease, So it is not useful choice here.

(C) Algae cannot survive in the absence of water.
Water is essential for algae formation. According to stimulus, water level is low and flow is quite slow in drought condition.

So C is winning choice to resolve the paradox.
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Re: In Australia, in years with below-average rainfall, less water goes in  [#permalink]

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05 Jul 2018, 09:12
Thanks pikolo2510 and gvij2017 for your explanations!

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Re: In Australia, in years with below-average rainfall, less water goes in  [#permalink]

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04 Nov 2018, 02:43
In such type of questions we can bring in outside or new information.

Read slowly and observe carefully the last line "But, by contrast, populations of algae drop in periods of extreme drought."
Though the argument mostly talks about slow water flow during low level rainfall and its benefit to algae, in the last line it tries to bring in a contrast that happens in extreme drought. So we need to reason why algae is less in extreme drought. Making option C correct.

Also this shows how important POE is on verbal. If u use POE u will be left with C and even if you miss the details in last sentence, you should be able to arrive at C with just POE.

Hope it helps!
Re: In Australia, in years with below-average rainfall, less water goes in   [#permalink] 04 Nov 2018, 02:43
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