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# One tank in a fish-farming system has been contaminated by a

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Director
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One tank in a fish-farming system has been contaminated by a [#permalink]

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11 Sep 2005, 05:07
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One tank in a fish-farming system has been contaminated by a rapidly reproducing species of algae that kills fish by drastically reducing water circulation. If the owners of the fish farm do nothing to rid the tank of these algae, all of the fish in the system will die.

Which of the following, if true, would most damage the conclusion above?

A. The species of fish in the tank produces waste containing bacteria that will destroy the algae before the algae reach the other tanks.

B. Some of the algae in the contaminated tank will die before reproducing.

C. The species of algae in the tank is a favorite food of Atlantic salmon.

D. There is no effective method of ridding the contaminated tank of algae.

E. All species of algae convert carbon dioxide to oxygen, a function vital to fish life.
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Cheers, Rahul.

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11 Sep 2005, 07:13
A is the best choice. It says that even though the farmer does nothing, the fishes might not die at all.
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Re: SC - RR3 [#permalink]

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11 Sep 2005, 08:29
I narrowed down to A & E. I am totally lost.

Why is E wrong ??
Also, please do let me know whether my reasons given below are fine as for rejecting the choice?

rahulraao wrote:
One tank in a fish-farming system has been contaminated by a rapidly reproducing species of algae that kills fish by drastically reducing water circulation. If the owners of the fish farm do nothing to rid the tank of these algae, all of the fish in the system will die.

Which of the following, if true, would most damage the conclusion above?

A. The species of fish in the tank produces waste containing bacteria that will destroy the algae before the algae reach the other tanks.

B. Some of the algae in the contaminated tank will die before reproducing.

***The others that survive may reproduce enough numbers. This still supports the conclusion.

C. The species of algae in the tank is a favorite food of Atlantic salmon.

***Out of scope

D. There is no effective method of ridding the contaminated tank of algae.

***If there is no effective method, there may exist some crude method which can still prevent other fish in the system from dying. The farmers may follow that method.

E. All species of algae convert carbon dioxide to oxygen, a function vital to fish life.

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Awaiting response,

Thnx & Rgds,
Chandra

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Re: SC - RR3 [#permalink]

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11 Sep 2005, 09:04
mallelac wrote:
I narrowed down to A & E. I am totally lost.

Why is E wrong ??
Also, please do let me know whether my reasons given below are fine as for rejecting the choice?

rahulraao wrote:
One tank in a fish-farming system has been contaminated by a rapidly reproducing species of algae that kills fish by drastically reducing water circulation. If the owners of the fish farm do nothing to rid the tank of these algae, all of the fish in the system will die.

Which of the following, if true, would most damage the conclusion above?

A. The species of fish in the tank produces waste containing bacteria that will destroy the algae before the algae reach the other tanks.

B. Some of the algae in the contaminated tank will die before reproducing.

***The others that survive may reproduce enough numbers. This still supports the conclusion.

C. The species of algae in the tank is a favorite food of Atlantic salmon.

***Out of scope

D. There is no effective method of ridding the contaminated tank of algae.

***If there is no effective method, there may exist some crude method which can still prevent other fish in the system from dying. The farmers may follow that method.

E. All species of algae convert carbon dioxide to oxygen, a function vital to fish life.

All E says is that the algae produces oxygen which is vital to fish life. However, this does not counter the argument that the algae hurts water circulation thus killing the fishes. A however says the algae can be broken down, and so the problem posed by the algae is no longer present.
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11 Sep 2005, 14:42
A it is.
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hey ya......

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15 Sep 2005, 19:26
A.

GA
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16 Sep 2005, 08:51
A here. Nothing else comes close enough to damaging the conclusion. If the algae is stopped before circulating than it won't cause the deaths of the fish at the farm.
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16 Sep 2005, 09:15
ywilfred wrote:
A is the best choice. It says that even though the farmer does nothing, the fishes might not die at all.

Safe bet A with wilfred!
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16 Sep 2005, 21:44
OA is indeed A guys! I was confused between A and E though!
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Cheers, Rahul.

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21 Sep 2005, 13:37
IMO A, just practicing....
21 Sep 2005, 13:37
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# One tank in a fish-farming system has been contaminated by a

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