A scientist made three observations: (1) in the world's : GMAT Critical Reasoning (CR)
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# A scientist made three observations: (1) in the world's

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08 Jan 2004, 22:20
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22. A scientist made three observations: (1) in the world's temperate zones, food is more plentiful in the ocean than it is in fresh water; (2) migratory fish in temperate zones generally mature in the ocean and spawn in fresh water; and (3) migratory fish need much nourishment as they mature but little or none during the part of their lives when they spawn. On the basis of those observations, the scientist formulated the hypothesis that food availability is a determining factor in the migration of migratory fish. Subsequently the scientist learned that in the tropics migratory fish generally mature in fresh water and spawn in the ocean.

Which one of the following would it be most helpful to know in order to judge whether what the scientist subsequently learned calls into question the hypothesis?

(A) whether in the world's temperate zones, the temperatures of bodies of fresh water tend to be lower than those of the regions of the oceans into which they flow

(B) whether the types of foods that migratory fish eat while they inhabit the ocean are similar to those that they eat while they inhabit bodies of fresh water

(C) whether any species of fish with populations in temperate zones also have populations that live in the tropics

(D) whether there are more species of migratory fish in the tropics than there are in temperate zones

(E) whether in the tropics food is less plentiful in the ocean than in fresh water
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12 Dec 2011, 23:42
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anandnk wrote:
22. A scientist made three observations: (1) in the world's temperate zones, food is more plentiful in the ocean than it is in fresh water; (2) migratory fish in temperate zones generally mature in the ocean and spawn in fresh water; and (3) migratory fish need much nourishment as they mature but little or none during the part of their lives when they spawn. On the basis of those observations, the scientist formulated the hypothesis that food availability is a determining factor in the migration of migratory fish. Subsequently the scientist learned that in the tropics migratory fish generally mature in fresh water and spawn in the ocean.

Which one of the following would it be most helpful to know in order to judge whether what the scientist subsequently learned calls into question the hypothesis?

(B) whether the types of foods that migratory fish eat while they inhabit the ocean are similar to those that they eat while they inhabit bodies of fresh water

(E) whether in the tropics food is less plentiful in the ocean than in fresh water

nonameee wrote:
E is the OA, but why is B wrong?

Premise (1) Ocean food > fresh water food
(2) migratory fish mature in Ocean BUT spawn in Fresh water
(3) migratory fish eat more food in Ocean > in Fresh water food

Hypothesis: FOOD AVAILABILITY is a determining factor in the migration of migratory fish

BUT the scientist learned that in the TROPICS migratory fish generally mature in fresh water and spawn in the ocean.

Choice B does not say anything about the abundance of food that preferred by TROPICS migratory fish between OCEAN and FRESH WATER. Rather, it only said about KIND OF FOOD => that is irrelevant. You are cheated at this point.

Hope that helps
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09 Jan 2004, 01:44
For the assumption to become hypothesis the scientist needs to know about the pattern of food availability in tropics.
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09 Jan 2004, 05:27
what is the question trying to ask. is it "which of the follwing should be determined if whatever he learned later questions the hypothesis?" Meaning which if determined will cast dount on the hypothesis?
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09 Jan 2004, 06:45
Hi folks can you please answer my question in the second post.
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09 Jan 2004, 06:53
anandnk wrote:
what is the question trying to ask. is it "which of the follwing should be determined if whatever he learned later questions the hypothesis?" Meaning which if determined will cast dount on the hypothesis?

Correct. You are on the right track.
We have to determine what if found about the latter discovery will weaken the earlier hypothesis.
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09 Jan 2004, 06:56
Hi sandeep,

The B talks about the availability of the food still. This is what the hypothesis states as a conclusion.

What do you think?
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09 Jan 2004, 07:08
anandnk wrote:
Hi sandeep,

The B talks about the availability of the food still. This is what the hypothesis states as a conclusion.

What do you think?

The conclusion is that food availability is a determining factor for migration among fish. However, if we don't know whether the fish eat the same kind of food, we cannot reach this conclusion.
Lets say the fish change thier foods according to places they migrate, then clearly food cannot the determining factor in migration of fish. This is exactly what B says, that the foods of the fish before and after have to be same. If not, it will weaken the hypothesis.
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09 Jan 2004, 07:35
Your explaination brings about the same question on both the observations. What about the scenario where oceans in tropics dont have more food than available in the fresh water. Then second observation is supported and at the same time first hypothesis is refuted.

Looks like everyone is trying to avoid getting fired.
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09 Jan 2004, 07:57
anandnk wrote:
Your explaination brings about the same question on both the observations. What about the scenario where oceans in tropics dont have more food than available in the fresh water. Then second observation is supported and at the same time first hypothesis is refuted.

Looks like everyone is trying to avoid getting fired.

How does Option E refute the hypothesis ?
If food is less plentiful in the ocean, it justifies/strengthens the hypothesis that fish move from fresh water (more food) to oceans (less food). Isn't it ?
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09 Jan 2004, 08:06
The question is not asking for refuting for sure. It is asking whether it will be helpful in judging if the first hypothesis is wrong.
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25 Nov 2011, 06:20
Can someone please explain why B is incorrect?

I got the question right. But I'm not sure why B is wrong here. My reasoning with B goes like this:

If the fish in tropical area moved into the ocean or fresh water not in accordance with food availability (which is author's hypothesis), then that would definitely help to question his hypothesis.

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25 Nov 2011, 18:50
I will go with E, what is the OA?
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27 Nov 2011, 06:48
E is the OA, but why is B wrong?
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26 Dec 2011, 11:26
E
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01 Dec 2015, 03:14
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Re: A scientist made three observations: (1) in the world's   [#permalink] 01 Dec 2015, 03:14
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# A scientist made three observations: (1) in the world's

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