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A scientist made three observations: (1) in the world’s temperate zone

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A scientist made three observations: (1) in the world’s temperate zone  [#permalink]

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New post 27 Sep 2019, 02:52
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65% (02:50) correct 35% (02:36) wrong based on 57 sessions

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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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Re: A scientist made three observations: (1) in the world’s temperate zone  [#permalink]

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New post 13 Oct 2019, 16:44
Bunuel wrote:
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



The answer can be arrived by concentrating on the hypothesis (which relates food/ nourishment to Maturity). Hence only B) and E) Can be arrived at.

Further the sentence also mentions that the maturity is attained due to plentiful food and hence our answer should be relating to quantity of food than the type of food.

Hence the answer E).
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Re: A scientist made three observations: (1) in the world’s temperate zone   [#permalink] 13 Oct 2019, 16:44
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A scientist made three observations: (1) in the world’s temperate zone

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