LSAT 109 – Section 4 – Question 14

LSAT 109 - Section 4 - Question 14

December 2000

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Question QuickView	Type	Tags	Answer Choices	Curve	Question Difficulty	Psg/Game/S Difficulty	Explanation
PT109 S4 Q14	+LR +Exp	Most strongly supported +MSS Conditional Reasoning +CondR Causal Reasoning +CausR	A 68% 168 B 12% 164 C 4% 161 D 15% 159 E 1% 157	149 159 168	+Harder	150.49 +SubsectionHarder

When soil is plowed in the spring, pigweed seeds that have been buried in the soil all winter are churned up to the surface and redeposited just under the surface. The brief exposure of the seeds to sunlight stimulates receptors, which have become highly sensitive to sunlight during the months the seeds were buried in the soil, and the stimulated receptors trigger germination. Without the prolonged darkness, followed by exposure to sunlight, the seeds do not germinate.

Summary

When soil is plowed in the spring, pigweed seeds are churned up and redeposited just under the surface. Brief exposure to sunlight stimulates receptors. When receptors are stimulated, germination is triggered. Prolonged darkness, followed by exposure to sunlight, is necessary for the seeds to germinate.

Strongly Supported Conclusions

Fewer pigweed seeds will germinate when a field is plowed at night versus a field that is plowed during the day.

Fewer pigweed plants will grow in the field if it is plowed only at night than if it is plowed during the day.

This answer is strongly supported. The last sentence tells us that exposure to sunlight is necessary for seeds to germinate. There is no sunlight at night, therefore the seeds are less likely to grow.

Fewer pigweed plants will grow in the field if it is not plowed at all than if it is plowed only at night.

This answer is unsupported. We don’t know from the stimulus what occurs whenever a field is not plowed at all.

Fewer pigweed plants will grow in the field if it is plowed just before sunrise than if it is plowed just after sunset.

This answer is unsupported. Before sunrise and after sunset both imply darkness. Exposure to sunlight is necessary for seeds to germinate.

The pigweed seeds that are churned up to the surface of the soil during the plowing will not germinate unless they are redeposited under the surface of the soil.

This answer is unsupported. We don’t know from the stimulus whether the seeds being redeposited is a necessary condition for germination.

All of the pigweed seeds that are already on the surface of the soil before the field is plowed will germinate.

This answer is unsupported. The last sentence tells us that prolonged darkness is necessary for seeds to germinate. If the seeds are already on the surface, then they were not exposed to prolonged darkness.

LSAT 109 – Section 4 – Question 14

LSAT 109 - Section 4 - Question 14

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LSAT PrepTest 109 Explanations

Section 1 - Logical Reasoning

Section 2 - Reading Comprehension

Section 3 - Logical Reasoning

Section 4 - Logical Reasoning

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