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When a caterpillar emerges from the egg on a tree branch, it immediate

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When a caterpillar emerges from the egg on a tree branch, it immediate  [#permalink]

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New post Updated on: 21 Nov 2018, 05:04
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When a caterpillar emerges from the egg on a tree branch, it immediately climbs upward until it finds a leaf bud to eat. Biologists thought that this behavior displayed an innate tendency to move in the direction opposite to the pull of gravity. In a recent experiment, a strong light source was placed at the bottom of a tree, and caterpillars, after hatching, climbed downward.

Which of the following hypotheses is best supported by the statements given?


A. Caterpillars have an innate tendency to move in the direction of gravity.

B. Newly hatched caterpillars are unable to see in the dark.

C. Newly hatched caterpillars move towards the strongest light source in the environment.

D. Newly hatched caterpillars move toward the leaf bud nearest to them.

E. The eyes of newly hatched caterpillars become less sensitive to light over time.

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Originally posted by sondenso on 10 May 2008, 18:05.
Last edited by Bunuel on 21 Nov 2018, 05:04, edited 2 times in total.
Renamed the topic and edited the question.
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Re: When a caterpillar emerges from the egg on a tree branch, it immediate  [#permalink]

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New post 10 May 2008, 19:21
Is there something that I missed in the question ?
It looks like an easy C.
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Re: When a caterpillar emerges from the egg on a tree branch, it immediate  [#permalink]

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New post 30 Nov 2014, 18:21
argument clearly points to light source either sun or light source. so conclusion that show this will be right one and C does that exactly.

Answer: C

sondenso wrote:
33.
When a caterpillar emerges from the egg on a tree branch, it immediately climbs upward until it finds a leaf bud to eat. Biologists thought that this behavior displayed an innate tendency to move in the direction opposite to the pull of gravity. In a recent experiment, a strong light source was placed at the bottom of a tree, and caterpillars, after hatching, climbed downward.
Which of the following hypotheses is best supported by the statements given?

(A) Caterpillars have an innate tendency to move in the direction of gravity.
(B) Newly hatched caterpillars are unable to see in the dark.
(C) Newly hatched caterpillars move towards the strongest light source in the environment.
(D) Newly hatched caterpillars move toward the leaf bud nearest to them.
(E) The eyes of newly hatched caterpillars become less sensitive to light over time.

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Re: When a caterpillar emerges from the egg on a tree branch, it immediate  [#permalink]

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New post 06 Apr 2018, 08:23
GMATNinja VeritasPrepKarishma

When a caterpillar emerges from the egg on a tree branch, it immediately climbs upward until it finds a leaf bud to eat at night time.

Do we not NEED highlighted text to mentioned in the argument?
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Re: When a caterpillar emerges from the egg on a tree branch, it immediate  [#permalink]

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New post 07 Apr 2018, 02:17
Totally stumped by the OA, it seems the argument assumes the hatching is always happening during the day and caterpillar just moves toward the sun.
Can we have few more explanations, please.
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Re: When a caterpillar emerges from the egg on a tree branch, it immediate  [#permalink]

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New post 08 Apr 2018, 17:30
adkikani wrote:
GMATNinja VeritasPrepKarishma

When a caterpillar emerges from the egg on a tree branch, it immediately climbs upward until it finds a leaf bud to eat at night time.

Do we not NEED highlighted text to mentioned in the argument?

We know that the caterpillar usually climbs upward. This behavior could be explained by "an innate tendency to move in the direction opposite to the pull of gravity." This explanation has nothing to do with light.

If we put a strong light at the bottom, the caterpillar will climb downwards. If the gravity explanation were valid, the caterpillar would climb upwards regardless of what's going on with the light. Now we have evidence that the caterpillar's movement has nothing to do with gravity. Instead, the caterpillar simply moves towards the strongest light source. Normally, this would be the sun, explaining the usual upward movement.

You might think, "Well, how do we know that the caterpillars are moving upwards when the sun is out?" True, we don't know for sure. But the information in the passage best supports choice (C).
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Re: When a caterpillar emerges from the egg on a tree branch, it immediate  [#permalink]

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New post 21 Nov 2018, 04:55
sondenso wrote:
When a caterpillar emerges from the egg on a tree branch, it immediately climbs upward until it finds a leaf bud to eat. Biologists thought that this behavior displayed an innate tendency to move in the direction opposite to the pull of gravity. In a recent experiment, a strong light source was placed at the bottom of a tree, and caterpillars, after hatching, climbed downward.
Which of the following hypotheses is best supported by the statements given?

A. Caterpillars have an innate tendency to move in the direction of gravity.
B. Newly hatched caterpillars are unable to see in the dark.
C. Newly hatched caterpillars move towards the strongest light source in the environment.
D. Newly hatched caterpillars move toward the leaf bud nearest to them.
E. The eyes of newly hatched caterpillars become less sensitive to light over time.


With the placement of artificial light we have to assume that it is brighter than the sun? How can we assume something is brighter than the sun?

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Re: When a caterpillar emerges from the egg on a tree branch, it immediate  [#permalink]

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New post 27 Nov 2018, 10:33
rashedBhai wrote:
sondenso wrote:
When a caterpillar emerges from the egg on a tree branch, it immediately climbs upward until it finds a leaf bud to eat. Biologists thought that this behavior displayed an innate tendency to move in the direction opposite to the pull of gravity. In a recent experiment, a strong light source was placed at the bottom of a tree, and caterpillars, after hatching, climbed downward.
Which of the following hypotheses is best supported by the statements given?

A. Caterpillars have an innate tendency to move in the direction of gravity.
B. Newly hatched caterpillars are unable to see in the dark.
C. Newly hatched caterpillars move towards the strongest light source in the environment.
D. Newly hatched caterpillars move toward the leaf bud nearest to them.
E. The eyes of newly hatched caterpillars become less sensitive to light over time.


With the placement of artificial light we have to assume that it is brighter than the sun? How can we assume something is brighter than the sun?

No, we don't need to assume that anything is brighter than the sun in order to choose (C).

Choice (C) states that newly hatched caterpillars move towards the strongest light source in the environment.

This is not the same as saying that newly hatched caterpillars move towards the strongest light source on the planet. It might be the case that in the immediate environment of the newly hatched caterpillars, available sunlight (not literally the sun, but the light that comes from the sun) is not as strong as whatever light source biologists placed at the base of the tree. Given that we're talking about a tree here, it would make perfect sense that the tree's own leaves block some sunlight from reaching the caterpillar's environment.

As I mentioned earlier, we don't know the precise sunlight conditions, but the information that we do have supports (C) more than it supports any other choice.

I hope this helps... um, shed some light on the situation?
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Re: When a caterpillar emerges from the egg on a tree branch, it immediate &nbs [#permalink] 27 Nov 2018, 10:33
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