LSAT 119 – Section 2 – Question 07

LSAT 119 - Section 2 - Question 07

June 2005

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT119 S2 Q07
+LR
Inference +Inf
Conditional Reasoning +CondR
A
3%
155
B
92%
164
C
2%
152
D
2%
156
E
1%
153
132
140
149
 +Easier 144.676 +SubsectionEasier

Although instinct enables organisms to make complex responses to stimuli, instinctual behavior involves no reasoning and requires far fewer nerve cells than does noninstinctual (also called flexible) behavior. A brain mechanism capable of flexible behavior must have a large number of neurons, and no insect brain has yet reached a size capable of providing a sufficiently large number of neurons.

Summary
Instinct allows organisms to make complex responses to stimuli.
Instinctual behavior doesn’t use reasoning.
Instinctual behavior uses fewer nerve cells than does noninstinctual (flexible) behavior.
In order for an organism to perform flexible behavior, their brain needs to have a lot of neurons.
As of now, no insect brain is big enough to hold enough neurons to facilitate flexible behavior.

Very Strongly Supported Conclusions
Insects aren’t currently capable of flexible behavior.
Insects currently only act based on instinct.

A
The behavior of organisms with elaborate brain mechanisms is usually not instinctual.
Unsupported. Even though instinctual behavior involves no reasoning and requires fewer nerve cells, this type of behavior might still utilize elaborate brain mechanisms. After all, it allows organisms to make complex responses!
B
Insect behavior is exclusively instinctual.
Very strongly supported. As shown below, by chaining the conditional claims, we see that “instinctual” is a necessary condition of “not having many neurons.” Insects don’t have many neurons; therefore, their behavior is instinctual!
C
All organisms with brains larger than insects’ brains are capable of some measure of flexible behavior.
Unsupported. There might be a gap between the size of insects’ brains and the size of brain required for flexible behavior! Also, while we know that having a relatively large brain is a necessary condition of flexible behavior, we don’t know that it’s sufficient.
D
All organisms with large brains are biologically equipped for flexible behavior.
Unsupported. While we know that having a relatively large brain is a necessary condition of flexible behavior, we don’t know that it’s sufficient: maybe flexible behavior requires other attributes, as well!
E
Only organisms with brains of insect size or smaller engage in purely instinctual behavior.
Unsupported. Animals with larger brains than insects might still not have big enough brains for flexible behavior! Furthermore, organisms might need other attributes to exhibit flexible behavior, so even organisms with large brains might still behave purely instinctually.

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LSAT PrepTest 119 Explanations

Section 1 - Reading Comprehension

Section 2 - Logical Reasoning

Section 3 - Logical Reasoning

Section 4 - Logical Reasoning

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