LSAT 130 – Section 1 – Question 24

LSAT 130 - Section 1 - Question 24

September 2009

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT130 S1 Q24
+LR
Weaken +Weak
Causal Reasoning +CausR
Part v. Whole +PvW
A
24%
161
B
4%
159
C
5%
159
D
19%
163
E
47%
167
155
166
177
 +Hardest 147.03 +SubsectionMedium

The Kiffer Forest Preserve, in the northernmost part of the Abbimac Valley, is where most of the bears in the valley reside. During the eight years that the main road through the preserve has been closed the preserve’s bear population has nearly doubled. Thus, the valley’s bear population will increase if the road is kept closed.

Summarize Argument: Phenomenon-Hypothesis
The author concludes that the valley’s bear population will increase if the road that runs through the preserve (which is a part of the valley) is kept closed. This is because during the past eight years, during which that road has been closed, the preserve’s bear population has nearly doubled.

Notable Assumptions
The author assumes that there has been an increase in the valley’s bear population over the eight years the road has been closed. (There’s a difference between the preserve’s population increasing and the valley’s population increasing.) The author also assumes that the closing of the road over the last eight years was the cause of the increase in the preserve’s bear population.

A
Most of the increase in the preserve’s bear population over the past eight years is due to migration.
Even if most of the increase is due to migration, this migration can still involve bears who were originally outside the valley. So, this doesn’t undermine the assumption that the valley bear population increased.
B
Only some of the increase in the preserve’s bear population over the past eight years is due to migration of bears from other parts of the Abbimac Valley.
This strengthens by establishing that only some, but not all, of the increase in the preserve’s bear population is from bears in the valley. This means some of the increase comes from bears outside the valley, which supports the assumption that the valley’s population increased.
C
Only some of the increase in the preserve’s bear population over the past eight years is due to migration of bears from outside the Abbimac Valley.
This strengthens by establishing that at least some of the increase in the preserve’s bear population is from bears outside the valley. This supports the assumption that the valley’s population did experience an increase during the eight years.
D
The bear population in areas of the Abbimac Valley outside the Kiffer Forest Preserve has decreased over the past eight years.
This answer is consistent with an increase in overall valley bear population. The population in the valley outside the preserve may have decreased, but the increase within the preserve might still outweigh that decrease, indicating some bears came from outside the valley.
E
The bear population in the Abbimac Valley has remained about the same over the past eight years.
This undermines the assumption that the valley’s population increased during the eight years. (E) establishes that the increase in the preserve’s population comes entirely from movement of bears from other parts of the valley.

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LSAT PrepTest 130 Explanations

Section 1 - Logical Reasoning

Section 2 - Reading Comprehension

Section 3 - Logical Reasoning

Section 4 - Logical Reasoning

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