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

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Joined: 04 May 2006
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When a caterpillar emerges from the egg on a tree branch, it  [#permalink]

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10 May 2008, 19:05
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90% (01:05) correct 10% (01:36) wrong based on 675 sessions

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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  [#permalink]

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10 May 2008, 20:21
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  [#permalink]

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30 Nov 2014, 19:21
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.

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

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06 Apr 2018, 09:23
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  [#permalink]

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07 Apr 2018, 03:17
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  [#permalink]

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08 Apr 2018, 18:30
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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