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# GRE high level rc(3)- scientists observe that an organism’s

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Manager
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GRE high level rc(3)- scientists observe that an organism’s [#permalink]  19 Feb 2015, 03:46
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Although scientists observe that an organism’s behavior falls into rhythmic patterns, they disagree about how these patterns are affected when the organism is transported to a new environment. One experimenter, Brown, brought oysters from Connecticut waters to 5 Illinois waters. She noted that the oysters initially opened their shells widest when it was high tide in Connecticut, but that after fourteen days their rhythms had adapted to the tide schedule in Illinois. Although she could not posit an unequivocal causal relationship between behavior and environmental change, Brown 10 concluded that a change in tide schedule is one of several possible exogenous influences (those outside the organism) on the oysters’ rhythms. Another experimenter, Hamner, however,discovered that hamsters from California maintain their original rhythms even at the South Pole. He concluded that endogenous influences (those inside 15 the organism) seem to affect an organism’s rhythmic behavior.
1. All of the following could be considered examples of exogenous influences on an organism EXCEPT
the influence of the

(A) level of a hormone on a field mouse’s readiness of mating
(B) temperature of a region on a bear’s hibernation
(C) salt level of a river on a fish’s migration
(D) humidity of an area on a cat’s shedding of its fur
(E) proximity of an owl on a lizard’s searching for food

[Reveal] Spoiler: OA
A

2. Which of the following statements best describes the conclusion drawn by Brown (lines 4-7)?

(A) A change in tide schedule is the primary influence on an oyster’s rhythms
(B) A change in tide schedule may be an important exogenous influence on an oyster’s rhythms
(C) Exogenous influences, such as a change in tide schedule, seldom affect an oyster’s rhythms
(D) Endogenous influences have no effect on an oyster’s rhythms
(E) Endogenous influences are the only influences on an oyster’s rhythms

[Reveal] Spoiler: OA
B

3. The passage suggests that Brown’s study was similar to Hammer’s in which of the following ways?

I. Both experimenters discovered that a new environment had a significant effect on an
organism’s behavioral rhythms
II. Both experimenters observed an organism’s behavioral rhythms after the organism had been
transported to a new environment
III. Both experimenters knew an organism’s rhythmic patterns in its original environment
(A) I only
(B) II only
(C) I and II only
(D) II and III only
(E) I, II, and III

[Reveal] Spoiler: OA
D

4. Which of the following, if true, would most weaken Brown’s conclusion?

(A) The oysters gradually closed their shells after high tide in Illinois had passed
(B) The oysters’ behavioral rhythms maintained their adaptation to the tide schedule in Illinois throughout thirty days of observation
(C) Sixteen days after they were moved to Illinois, the oysters opened their shells widest when it was high tide in Connecticut
(D) A scientist who brought Maryland oysters to Maine found that the oysters opened their shells widest when it was high tide in Maine
(E) In an experiment similar to Brown’s, a scientist was able to establish a clear causal relationship between environmental change and behavioral rhythm

[Reveal] Spoiler: OA
C

Manager
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Re: GRE high level rc(3) [#permalink]  22 Feb 2015, 09:02
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if you want to get a good score in GRE verbal, you would have to select proper way of approach for Reading comprehension.
if you are thinking, it would be enough that you read a rc and try to find out answer.

That is big mistake made in GRE's RC.

Try to figure out and why you are selecting any answer, you need to concentrate on try to explain yourself that ""this is a reason for selecting this answer"".

If you are reading it, try to give your explanation for every question.
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Joined: 03 Apr 2015
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Re: GRE high level rc(3) [#permalink]  03 Apr 2015, 03:42
GRE wrote:
Although scientists observe that an organism’s behavior falls into
rhythmic patterns, they disagree about how these patterns are
affected when the organism is transported to a new environment.
One experimenter, Brown, brought oysters from Connecticut waters to
5 Illinois waters. She noted that the oysters initially opened their
shells widest when it was high tide in Connecticut, but that after
fourteen days their rhythms had adapted to the tide schedule in
Illinois. Although she could not posit an unequivocal causal
relationship between behavior and environmental change, Brown
10 concluded that a change in tide schedule is one of several possible
exogenous influences (those outside the organism) on the oysters’
rhythms. Another experimenter, Hamner, however, discovered that
hamsters from California maintain their original rhythms even at the
South Pole. He concluded that endogenous influences (those inside
15 the organism) seem to affect an organism’s rhythmic behavior.

1. All of the following could be considered examples of exogenous influences on an organism EXCEPT
the influence of the
(A) level of a hormone on a field mouse’s readiness of mating
(B) temperature of a region on a bear’s hibernation
(C) salt level of a river on a fish’s migration
(D) humidity of an area on a cat’s shedding of its fur
(E) proximity of an owl on a lizard’s searching for food

2. Which of the following statements best describes the conclusion drawn by Brown (lines 4-7)?
(A) A change in tide schedule is the primary influence on an oyster’s rhythms
(B) A change in tide schedule may be an important exogenous influence on an oyster’s rhythms
(C) Exogenous influences, such as a change in tide schedule, seldom affect an oyster’s rhythms
(D) Endogenous influences have no effect on an oyster’s rhythms
(E) Endogenous influences are the only influences on an oyster’s rhythms

3. The passage suggests that Brown’s study was similar to Hammer’s in which of the following ways?
I. Both experimenters discovered that a new environment had a significant effect on an
organism’s behavioral rhythms
II. Both experimenters observed an organism’s behavioral rhythms after the organism had been
transported to a new environment
III. Both experimenters knew an organism’s rhythmic patterns in its original environment
(A) I only
(B) II only
(C) I and II only
(D) II and III only
(E) I, II, and III

4. Which of the following, if true, would most weaken Brown’s conclusion?
(A) The oysters gradually closed their shells after high tide in Illinois had passed
(B) The oysters’ behavioral rhythms maintained their adaptation to the tide schedule in Illinois
throughout thirty days of observation
(C) Sixteen days after they were moved to Illinois, the oysters opened their shells widest when it was
high tide in Connecticut
(D) A scientist who brought Maryland oysters to Maine found that the oysters opened their shells
widest when it was high tide in Maine
(E) In an experiment similar to Brown’s, a scientist was able to establish a clear causal relationship
between environmental change and behavioral rhythm

An

Please mention the answers
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Re: GRE high level rc(3) [#permalink]  30 Jul 2015, 23:11
1. A
2. B
3. D
4. D

Got the last one wrong. Couldn't quite get the last one.
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Re: GRE high level rc(3)- scientists observe that an organism’s [#permalink]  05 May 2016, 08:02
1 A
2 B
3 D
4 D
why answer 4 is C ?
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Re: GRE high level rc(3)- scientists observe that an organism’s [#permalink]  18 Jun 2016, 06:38
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question 4 seeks for the option that most weakens the Brown's conclusion. Since she concluded that the exogenous factors influence the behavioral rythems, we need to find an option that implies the behavioural patterns have not adapted after a while. This is clearly implied by option c since it says that the oyster still opened their shells widest after sixteen days which means that the behavioral adaption did not occure.
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Re: GRE high level rc(3)- scientists observe that an organism’s [#permalink]  18 Jun 2016, 08:16
Expert's post
Edited the post and adding the OA properly. Good passage
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Re: GRE high level rc(3)- scientists observe that an organism’s [#permalink]  12 Feb 2019, 01:34
why isnt 1st AND LAST E
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Re: GRE high level rc(3)- scientists observe that an organism’s [#permalink]  14 Feb 2019, 11:35
Expert's post
Sorry,

from what you wrote I do not understand to which question you refer to.

Please elaborate better.

Regards
_________________
Re: GRE high level rc(3)- scientists observe that an organism’s   [#permalink] 14 Feb 2019, 11:35
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# GRE high level rc(3)- scientists observe that an organism’s

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