LSAT 111 – Section 1 – Question 19

LSAT 111 - Section 1 - Question 19

October 2001

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT111 S1 Q19
+LR
Most strongly supported +MSS
Causal Reasoning +CausR
A
4%
157
B
1%
150
C
93%
165
D
1%
155
E
1%
156
129
139
148
 +Easier 147.471 +SubsectionMedium

Kevin’s explanation

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Lathyrism, a debilitating neurological disorder caused by the consumption of the legume Lathyrus sativus, is widespread among the domestic animals of some countries. Attempts to use rats to study lathyrism have generally failed. Rats that ingested Lathyrus sativus did not produce the symptoms associated with the disorder.

Summary
The stimulus says that eating Lathyrus sativus (L.S.) can cause domestic animals to develop a severe disorder called lathyrism. However, researchers have failed to use rats to study lathyrism. This is because rats that ate L.S. didn’t develop lathyrism symptoms.

Strongly Supported Conclusions
These conclusions are strongly supported:
Not all animals that eat L.S. will develop lathyrism.
Rats are less vulnerable to lathyrism than at least some other animals.

A
The physiology of rats is radically different from that of domestic animals.
This is not supported. The stimulus doesn’t offer any general facts about the physiology of rats versus domestic animals. We don’t even know why rats don’t develop lathyrism, let alone if it’s due to a “radical” difference in physiology.
B
The rats did not consume as much Lathyrus sativus as did the domestic animals that contracted lathyrism.
This is not supported. Nothing in the facts suggests how much L.S. is needed to cause lathyrism in domestic animals, how much the affected domestic animals actually eat, nor how much was given to the rats.
C
Not all animal species are equally susceptible to lathyrism.
This is strongly supported. The stimulus says that rats don’t develop lathyrism from eating L.S., even though lathyrism is widespread in some domestic animal species. This lets us infer that different species of animals have different susceptibility to lathyrism.
D
Most of the animals that can contract lathyrism are domestic.
This is not supported. The stimulus mentions that lathyrism occurs in some domestic animals, but doesn’t indicate whether or not it can occur in non-domestic animals. Because we don’t know anything about non-domestic animals, we can’t compare.
E
Laboratory conditions are not conducive to the development of lathyrism.
This is not supported. The facts strongly imply that the problem with these lathyrism studies is that rats don’t develop lathyrism; nothing suggests that the laboratory conditions themselves are to blame. We don’t even know for sure if the studies happen in a laboratory!

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LSAT PrepTest 111 Explanations

Section 1 - Logical Reasoning

Section 2 - Reading Comprehension

Section 3 - Logical Reasoning

Section 4 - Logical Reasoning

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